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6[[quoteright:323:[[Franchise/{{Tintin}} https://static.tvtropes.org/pmwiki/pub/images/pretext_for_war_4.jpg]]]]
7
8->''He messed with the H.R.E. - Casus Belli.''\
9''Shattered Stability - Casus Belli.''\
10''Prussia, Denmark, France - This is a call to arms!''\
11''England stood no chance - This is a call to arms!''\
12''But we couldn't be happier, now that he attacked,'' \
13''We have '''Casus Belli'''!''
14-->-- "[[https://www.youtube.com/watch?v=nUZvwxucXbw Casus Belli]]", ''VideoGame/EuropaUniversalis IV: TheMusical''
15
16The leaders of Viridia and Tyria want to go to war. Not for a {{silly reason|ForWar}}, but due to anything from good old-fashioned jingoism, greed, political/economic/religious differences, or a simple historical grudge. However, they can't just out and out declare war, [[SarcasmMode that would be uncivilized!]] And more importantly, it would make them look bad to the international community, which isn't good politics. So instead they will wait for or manufacture a Pretext for War out of whatever should come their way.
17
18Did a Tyrian pig farmer lose a pig when it wandered into Viridia? ThisMeansWar Maybe a Viridian girl disappeared near the Tyrian border? Tyrian slavers must want to [[MarsNeedsWomen capture Viridian women]] since theirs are so ugly! A favorite is for StarCrossedLovers from both sides (preferably royalty) to elope, causing both sides to assume the other kidnapped their heir.
19
20One interesting and {{iron|y}}ic variant is when hardline elements from both sides will collaborate to stage a high-profile assassination or other incident to kickstart a war, proving [[TeethClenchedTeamwork just how well they work together to achieve their goals despite hating each other's guts]]. This one is especially common when one or both nations have a ReasonableAuthorityFigure as a head of state, since it can force their hand to war, or if they're the assassination target, get them out of the picture ''and'' make them an unwitting martyr. FalseFlagOperation is one of the classical moves too, and almost a Twentieth Century theme song.
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22Point is, an incident any two sane heads of state would quietly defuse is treated as a RageBreakingPoint in order to start the war. In these cases, heroes typically have to uncover the plot in order to PreventTheWar.
23
24A technical term for this is the Latin term ''Casus Belli'', or case for war.
25
26Since [[http://en.wikipedia.org/wiki/War_of_aggression wars of aggression]] have technically been banned, you'll find that these are a lot more common today than they were previously, since both sides are at pains to show that the other side started it. As a result, the history of many a 20th-century war reads like a really, really dark FawltyTowersPlot. Mind you, "civilized" countries have more or less always deemed it improper to declare war on your neighbors "because we want your stuff" or "because we feel like it" or even "because we're afraid of you"; even an aggressive war would have to have some kind of triggering incursion, insult, or violation behind it. (Look up how each of the three UsefulNotes/PunicWars got started — the pretexts are hilariously flimsy.)
27
28See also WarForFunAndProfit.
29
30----
31!!Examples:
32[[foldercontrol]]
33
34[[folder:Anime & Manga]]
35* The plot of ''Anime/AldnoahZero'' is kicked off when Princess Asseylum Vers Allusia, the granddaughter of the emperor of Mars, is assassinated in a terrorist attack on Earth during her [[{{Irony}} diplomatic mission]]. The Orbital Knights, the Martian warrior nobility, react immediately with a [[EarthIsABattlefield full-scale invasion of Earth]]. Unbeknownst to the majority of the knights, [[spoiler:the assassination was a FalseFlagAttack perpetrated by a faction of their own government in order to force the conquest of Earth.]]
36* ''Literature/CrestOfTheStars'': The United Mankind attacks an Abh ship through a previously unknown hyperspace lane, then declares that they were attacked first and destroyed the ship in self-defense. They use this incident to begin stirring up their allies and begin to build an excuse to go to war with the Abh. The Abh Empress doesn't believe for an instant that the Abh ship is to blame, realizes what the United Mankind is up to, and decides to just cut to the chase and declare war ''immediately'', which catches the United Mankind and their allies off-guard.
37* ''Manga/FairyTail'': Jose Porla, the leader of the Phantom Lord guild, was tired of being AlwaysSecondBest to Fairy Tail, and he was eager for a job to come up that would give him an excuse to fight them. So when Lucy's rich father hires Phantom Lord to bring her home, he doesn't merely kidnap her but also commits increasingly extreme acts of violence against Fairy Tail in order to goad them into a conflict that would culminate in Fairy Tail and the town it resides in being wiped off the map.
38* In ''Literature/{{Overlord|2012}}'', when the Sorcerer Kingdom's TooDumbToLive UnwittingPawn attacks and pillages a convoy they had sent with humanitarian aid for the Roble Holy Kingdom, [[IndyPloy Ainz ditches his original plan]] of destabilizing the Re-Estize Kingdom before vassalizing them and [[CuttingTheKnot uses the incident as an excuse]] to [[ThisMeansWar declare war against them]] instead.
39* The finale of ''Literature/StarshipOperators'', [[spoiler:the Earth Alliance invades the Henrietta Sector on the pretext of defending the Kiba government-in-exile onboard the ''Amaterasu'' from the Kingdom. However the ''Amaterasu'' crew decide they'd rather not be used like that]].
40* A heroic example occurs in ''Anime/YuGiOhArcV'', with [[spoiler:LDS]] (Group A) taking advantage of the team from [[spoiler:Academia]] (Group B) going to [[spoiler: Miami City]] (part of A's territory) on a mission to kidnap two LivingMacGuffin characters. Group A gets footage of B's soldiers using hyper-advanced {{Magitek}} weapons to [[spoiler: seal the souls of]] (metaphor [[NeverSayDie for murder]]) bystanders that get caught in the crossfire. The propaganda created from the footage convinces the people of A's home that B is invading, and that they must militarize and fight back. The reason why it's a heroic example is because B already has invaded a different [[spoiler:dimension]] and committed genocide upon it's inhabitants; [[FramingTheGuiltyParty it just hasn't moved onto A's home]] ''[[FramingTheGuiltyParty yet]]'', and the people running A want to ensure that their home is capable of defending itself when the need arises.
41[[/folder]]
42
43[[folder:Comic Books]]
44* ''ComicBook/FuryMAX'': An ex-Hydra agent named Gagarin meets up with Fury and suggests that they start a war somewhere to give each other something to do (what with the Soviet Union gone, SHIELD has suffered major budget cuts and is now led by an ObstructiveBureaucrat). Gagarin proceeds to start a war in a island BananaRepublic and does everything he can to escalate the conflict, with Fury barely preventing a full world war, killing the man himself but losing his squad. And to his horror, Gagarin's last words ring true in his mind: [[NotSoDifferentRemark That if Gagarin hadn't done it, Fury would have]].
45* ''ComicBook/{{Monstress}}'': The series starts with [[AntiHero Maika]], in a personal action to find out more about her deceased mother's secret projects, [[BatmanGambit allowing herself to be captured as a slave, then to be hijacked at auction by the Cumaea, and brought to their local fortress]]. Maika then breaks loose and sparks off a prison break to cover for her while she goes hunting for the Cumaea witch Yvette (an old associate of her mother's) for answers. After the riot, the [[EliteMooks Inquisitrix]] (the Cumaea's enforcers) arrive in force and kill the surviving Cumaea and army grunts, stating in their official report in very [[FantasticRacism racist]] and ideologically-charged terms that the Arcanics deliberately left no survivors; they then recapture the Arcanic fugitives and execute them to [[LeaveNoWitnesses make sure that there were no loose ends]]. This all gives the main Cumaea enough material to [[FalseFlagOperation justify that the Federation go back to war]]. The only survivors of the massacre are the Cumaea Sophia, Atena, and Yvette (the latter being resurrected after Maika killed her), [[CantKillYouStillNeedYou because they were still useful to the Cumaea's schemes]].
46* ''ComicBook/{{Tintin}}'':
47** ''[[Recap/TintinTheBlueLotus The Blue Lotus]]'' has a thinly-disguised replay of the Mukden Incident used as a pretext for additional Japanese intervention in China.
48** ''[[Recap/TintinTheBrokenEar The Broken Ear]]'': A CorruptCorporateExecutive encourages Tintin (then working as the aide to a BananaRepublic's dictator) to declare war on a neighbouring country (while they're arming both sides and claiming a disputed territory has vast oil resources). Tintin point-blank refuses, so the executive frames him and he's forced to flee the country in a staff car. The car is fired upon by the [[BorderCrossing border guards]] and the [[NiceJobBreakingItHero incident itself is then used as an excuse for war]].
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51[[folder:Fan Works]]
52* ''Fanfic/AfterThatFatefulNight'': The griffons decide to invade Equestria after Nightmare Moon takes over, citing Princess Celestia's disappearance as their primary reason for doing so. This actually convinces [[spoiler:the remnants of the royal guard]] to join forces with them.
53* ''Fanfic/CodePrime'': Despite their alliance, many of the lower-ranked Decepticons are eager to wage war with the Earth, irritated with the Holy Britannian Empire's FantasticRacism and inefficiency. Once Megatron learns about [[spoiler:the Ragnarok Connection]], he launches a full-scale invasion.
54* At one point in ''Fanfic/EarthsAlienHistory'', the [[TheAlliance Terran Treaty Organization]] colonizes the Rama star cluster, which the [[Manga/OutlawStar Invincible Ctarl-Ctarl Empire]] claims to have already put a stake in (despite never colonizing or occupying). To try and rectify this, Ctarl-Ctarl [[AssInAmbassador ambassador]] Aisha Clanclan conspires with a high-ranked friend in the military to place a fleet on a "training exercise" on the border, in the hopes that they'll be fired upon by [=TeTO=], enabling them to start a war that will result in the Ctarl-Ctarl taking the cluster for themselves. [[spoiler: Except the resulting border skirmish never escalates into a full-scale war, and [=TeTO=] puts more effort into it, so the Ctarl-Ctarl get their asses kicked.]]
55* ''Fanfic/EquestriaTotalWar'': The Gryphons justify their war against Equestria by deeming the ponies' control over nature to be blasphemous and fundamentally immoral. At one point, Derpy learns that this pretext is so thin that even in their own armies, no gryphon who holds a rank higher than lieutenant actually ''believes'' in their supposed cause.
56* ''Fanfic/FaithInSuperiorFirepower'': After the Bright Foundation loses one of their science outposts to hostile wildlife, they establish a colony on that same planet in order to justify assigning and deploying a large amount of military and special forces units to the area, all to protect their scientific investments under the pretense of protecting the colony.
57* ''Fanfic/FalloutEquestria'': "[[RememberTheAlamo The Littlehorn Massacre]]" was the primary reason for the war between the zebras and Equestria, especially with the return of [[DarkIsNotEvil Princess Luna]]. The zebras were highly superstitious and terrified of Luna, due to her close association with the stars and night, which the zebras believed were evil. Celestia, Luna's sister and ruler of Equestria, built her sister a school at the edge of Equestria to help her get out of the GildedCage that Celestia had unintentionally created. This location was close to zebra land, and things were already strained due to trade talks and arguments over resources. When a zebra refugee convoy passed too close to the school one night, the school faculty panicked and activated their defenses, wiping out the convoy. One of the survivors was a zebra commando, who slipped into the school grounds and unleashed a chemical weapon that killed everyone, faculty and students alike. The "Littlehorn Massacre" destroyed any possibility of peace between the two countries. Celestia [[MyGodWhatHaveIDone felt so much guilt over having built Luna's school at Littlehorn in the first place]] that she [[AbdicateTheThrone stepped down as ruler of Equestria and gave the throne to Luna]]. And, once again, because the zebras viewed Luna as basically the AntiChrist, this made everything even worse.
58* ''Fanfic/WhatAboutWitchQueen'':
59** The final reason for Arendelle and Weselton to go to war is a scout shooting incident, which is a result of tensions building up to the point that two armies are less than a mile from each other. Schemers on both sides set the entire situation up (sending armies, choosing GeneralRipper to be one of the commanders) so it would end that way.
60** Hans' plan to keep Westerguard is to start a war between Isles and Arendelle by killing Anna and making it look as if it's Islanders' fault.
61* ''Fanfic/YourHeartAHavenOfThornsNaruto'' has a {{Justified|Trope}} version: Summoned beasts take contracts ''very seriously'', a fact Enma once exploited in order to trick the Tiger clan into a terrible deal involving [[WouldHurtAChild the death of an innocent cub]]. Ever since then, the Tiger clan have been looking for an opportunity to enact their revenge; however, Enma's father has been careful to ensure that the Tigers have been unable to find any further fault with the Monkeys. Then Enma's summoner Hiruzen, [[PoorCommunicationKills unaware of all this]], inadvertently provides the Tigers with just the sort of excuse they were looking for...
62[[/folder]]
63
64[[folder:Films — Live-Action]]
65* ''Film/{{Aquaman|2018}}'' has [[BigBad King Orm]] using an empty remote-controlled military submarine in a FalseFlagOperation to attack him and King Nereus, all to convince Nereus and their respective kingdoms that the surface world is enough of a threat to go to war with. [[spoiler:In fact, Nereus isn't fooled for a moment, but since he ''also'' wants war with the surface, he plays along.]]
66* Creator/TheMarxBrothers' ''Film/DuckSoup''. Essentially just bankruptcy and personal slights. Some of which were ''hypothetical'' slights that didn't actually happen, at that.
67* The plot of ''Film/TheEmperorAndTheAssassin'' is about this--Ying Zheng seeks to conquer all of China, and needs a pretext to attack the state of Yan. So he sends the Lady Zhao to convince the King of Yan to send an assassin to kill him, to stop this invasion from taking place.
68* When Guy de Lusignan becomes King of Jerusalem in ''Film/KingdomOfHeaven'', he releases Reynald in order for him to do something to start a war with Saladin. In an earlier scene Saladin's adviser had remarked that Guy becoming king meant Saladin didn't have to find one himself since the man was stupid enough to start a war he couldn't win. Saladin would come to regret waiting for it, since Reynald went with "murder Saladin's sister" as his provocation.
69* In ''Film/TheManWhoKnewTooLittle'', members of the British and Russian intelligence services are collaborating together for a bombing that would take out the top table of a British/Russian peace conference. The British spymaster is seen longing for the new funding, equipment, and poisons that renewed tensions would bring. When the hero unwittingly starts getting in the way, the Russian spymaster complains, "If we cannot trust each other, how can we bring back Cold War together?"
70* In ''Film/TheOutlawsIsComing'', Rance Roden is attempting to hunt the buffalo into extinction to goad the Indians into war, and allow him to [[WarForFunAndProfit make a profit selling arms to the Indians]] and eventually seize control of the US west of the Mississippi.
71* ''Film/ThePrincessBride'' has this as its entire plot: the men who kidnap Buttercup are doing so in order to start a war between Florin, her home country, and their enemy of Guilder. [[spoiler:The plot is masterminded by her fiancé Prince Humperdinck; after Vizzini's kidnapping plot is foiled, he decides to personally murder her on their wedding night, saying that it'll work even better.]]
72* A very common reading of ''Film/StarshipTroopers'' is this. The [[ColonyDrop meteor strike]] that the Federation blames on the bugs is [[FridgeLogic incredibly suspect]]; there's no stated evidence for it and propelling an asteroid across many light-years at apparently sublight speed [[SciFiWritersHaveNoSenseOfScale makes absolutely no sense]]. Given the personality of the Federation, it's much more likely that the impact was either a natural disaster or even orchestrated by ''them'', and then credited to the bugs.
73* ''Film/StarTrekVITheUndiscoveredCountry'':
74** The movie features [[spoiler:a combined conspiracy by both Starfleet officers and Klingon military leaders]] to try to veer both nations onto the path to war by [[spoiler:having each side's ReasonableAuthorityFigure assassinated by agents from the other side]]. Given how the Federation has been definitely in the stronger economic and military position at the time, many fans have since hypothesized that the respective [[spoiler:Klingons]] were goaded into "dying on their feet rather than living on their knees" by [[RetCon Section 31 machinations]].
75** The [[Franchise/StarTrekExpandedUniverse novel]] "Sarek" indicates that the the actual masterminds behind this plot were [[spoiler:the Romulans]], who in the movie had seemed to just be bit players.
76** In ''Film/StarTrekIntoDarkness'', Admiral Marcus sent Kirk and the Enterprise into Klingon space to take down John Harrison, then sabotaged the Enterprise's warp engines so they would be easy prey for the Klingons, using the destruction of the Enterprise as a pretext to start a war with the Klingon Empire.
77* ''Franchise/StarWars'' has many thanks to the machinations of [[PresidentEvil Chancellor]] [[MagnificentBastard Palpatine]]:
78** In ''Film/ThePhantomMenace'', he directs the [[MegaCorp Trade Federation]] to invade [[PerfectPacifistPeople Naboo]] over a trivial dispute creating a political crisis that ousts the current Chancellor and lets him claim the seat as a popular champion for reform against [[ObstructiveBureaucrat obstructive bureaucracy]].
79** In ''Film/AttackOfTheClones'' the Clone Wars are sparked when revelation that the Separatists have built a secret army of droids on Geonosis prompts the Republic to deploy the recently discovered clone army grown on Kamino, despite the shady and unknown details of ''their'' secret commissioning years earlier. Of course, ''both'' these armies were built by Palpatine's design and the war itself is just a pretext to seizing control and turning TheRepublic into TheEmpire
80** Which comes to fruition in ''Film/RevengeOfTheSith'', when he completes his takeover by luring the Jedi into coming after him directly and trying to kill him. He decries it as an assassination attempt and a failed coup d'etat on their part, all the justification he needs to brand every Jedi a traitor and mark them for death just as he orchestrates victory in the civil war declares himself Emperor.
81* In the 1982 political satire ''Film/WrongIsRight'', two suitcase nukes acquired by a Middle Eastern dictator are found on top of the World Trade Center. After being successfully disarmed, they're used to justify invading that country and seizing its oil. The last thing we see of the dictator as he's being bombed is him complaining that the whole thing was a set-up, as he still has the nukes in his possession. The movie became HarsherInHindsight after the events of 9/11.
82[[/folder]]
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84[[folder:Literature]]
85* Mocked in ''Literature/TenSixtySixAndAllThat'', which names the countries principally involved in fighting and where the fighting took place in UsefulNotes/TheCrimeanWar and UsefulNotes/WorldWarI after describing the incidents that precipitating them involving entirely different countries.
86* {{Discussed|Trope}} in the Creator/TomClancy novel ''Literature/TheBearAndTheDragon''. China is considering initiating a war of aggression against Russia, and Russian observation planes are staying well within Russian air space, but examining the Chinese preparations. The Chinese war minister recommends shooting down one of the spy planes and stating that it had violated Chinese air space, and then using that as ''casus belli'' for the war. This is never mentioned again, mostly because, thanks to a well-placed spy, China's opponents know exactly what they're doing.
87* ''Literature/CrestOfTheStars'' has a complex one. First is the destruction of the ''Gosroth'' with United Mankind insisting on setting up a joint investigation committee, with the suggestion that tensions are running high after the Abh annex the Hyde System. Ultimately subverted in that it is revealed that UM has been planning the whole thing for decades and on the Abh side Empress Ramaj sees right through it and refuses to play their games. She basically says "If you want a war then I will give you a war."
88* ''Literature/{{Discworld}}'':
89** ''Literature/{{Jingo}}'' is built around one - unsurprisingly, given the name. The excuse for war is a worthless island that's risen from the bottom of the sea after a volcanic event, almost exactly between Ankh-Morpork and Klatch. The two nations have been at peace for decades, but since the island would be such a useful launching point for an invasion if they ''did'' go to war, tensions immediately escalate over who gets to claim it - or as Vimes puts it, "we're supposed to go to war over some rock that's only useful if we have to go to war?" A more politically acceptable excuse to go to war and seize the island (the attempted assassination of a diplomat) had to be manufactured as a result. Fortunately, Sam Vimes wasn't fooled for a minute and set out to put a stop to it before things got out of hand. [[spoiler:Carrot ended up [[RefugeInAudacity arresting two entire armies for, among other things, Conspiracy to Commit a Breach of the Peace]] and buying enough time for Vetinari to swing a large number of trade concessions in return for ceding the island to the other side... about half an hour before it sinks again.]]
90** In ''Literature/SmallGods'', Omnia declared war on Ephebe in retaliation for the murder of an Omnian missionary... well, the mocking and humiliation of an Omnian missionary who was later mysteriously murdered on his way home, but the ''fundamental'' truth is that the Ephebians murdered the missionary by not embracing his preachings. While this led to a CurbStompBattle that sunk the Omnian fleet, Exquisitor Vorbis made the most of the situation, [[spoiler:by sneaking an Omnian army - that had begun crossing the desert ''before'' the missionary even entered Ephebe - into the enemy capital [[ISurrenderSuckers during peace talks]]. "You had to have a mind like Vorbis' to plan your retaliation before your attack."]]
91** In ''Literature/InterestingTimes'', Lord Hong is giving extensive support to highly ineffective "revolutionaries" to create a pretext for him to launch a potent counter-revolution. As his long-term goal is to TakeOverTheWorld, he arranges for them to have a figurehead from outside TheEmpire (Rincewind), giving him an excuse to declare war on Ankh-Morpork in the future.
92* ''Literature/TheDresdenFiles'': In book 3, ''Literature/GravePeril'', this turns out to be the cause of most of the problems of the books: [[spoiler:the Red Court was ready to launch a war against the White Council, and just needed a good excuse to do so, so they manipulate Harry into breaking SacredHospitality.]] Harry sees that he's being maneuvered into the trap and knows what the consequences will be, but since the alternatives would be the death of him and several innocents, along with the unmaking of a Holy Sword, he does it anyway.
93** Only part of [[spoiler:the Court]] wanted to go to war. The people behind the incidents of the novel wanted to make Harry suffer, figuring he wasn't crazy enough to trigger a full-on war... which he was. The more level-headed members tried to broker peace later [[spoiler:because the war started before all their preparations were complete, preventing a quick victory for the Court]].
94* ''The Emperor's Coloured Coat'' by John Biggins. Otto Prohaska gets caught up in the plot to assassinate Archduke Ferdinand to create a pretext for war against Serbia. There are indications that the Austrian chief of staff is behind it, and Otto never finds out if the Archduke's death was part of the conspiracy or simply a lucky break by the assassins, who were so incompetent it was assumed they'd be caught long before they got near their target. Regardless, as the assassination triggers World War One and the break-up of Austria-Hungary, it turned out to be an even bigger cock-up.
95* Mocked in ''Literature/TheElenium'', when a discussion on whether to go to war with Otha and his Zemochs could be justified. It’s brought up that there was never an armistice or even a declared ceasefire, just the fact that both sides bludgeoned each other to exhaustion that led an end to the overt hostilities. One of the Church Knights jokes that the Eosian continent was just resting, for 500 years, and that they felt sufficiently rested to resume the fight.
96* ''Literature/FireAndBlood'': Aegon the Conqueror had already been planning on taking Westeros one way or another, he and his sisters having scouted out much of the continent beforehand, but it's only when his offers of dynastic alliance are violently rebuffed that his family bring out the dragons, and set about taking it by force.
97* ''Literature/HowARealistHeroRebuiltTheKingdom'':
98** A multilayered one in volumes 2-4. Main character Souma Kazuya, the [[TrappedInAnotherWorld summoned hero]]-turned-King of Elfrieden, baits the antagonistic neighboring country of Amidonia into aiding the other side in an uprising against his rule by corrupt nobles. Amidonia is itself using the CivilWar as cover to retake some of the territory they lost to Elfrieden in a war two generations earlier. Souma defeats them and occupies their capital, and deliberately makes himself look good to the citizens compared to the ultra-militaristic Amidonian royals by investing in their arts and culture, the goal being to make them long for him to come back after he withdraws and give him an excuse to occupy that part of the country permanently. [[spoiler:He miscalculates slightly: Princess Roroa of Amidonia orchestrates a nationwide uprising that forces her brother Julius to flee the country, and then betrothes herself to Souma to unite them into the United Kingdom of Friedonia.]]
99** {{Subverted}} in volume 13. Souma gets into a conflict with the Nine-Headed Dragon Archipelago Union over fishing rights, and spends several months with foreign propagandists trumpeting to the fiercely independent islanders about how he's coming to attack them, with the fishing dispute as the pretext for invasion. [[spoiler:The war itself was the actually the pretext for a GenghisGambit he arranged ahead of time with the Nine-Headed Dragon King, Shana, who used it as an excuse to get the islands' fleets to marshal in one place [[WeAreStrugglingTogether after their terminally fractious chiefs couldn't agree on a plan to deal with the root cause of the problem]]--a {{kaiju}} named Ooyamizuchi--as well as give Souma's heavier naval vessels an excuse to be there to help.]]
100* The manufacture of such a pretext is a major plot point in both the film and book versions of ''Literature/ThePrincessBride''.
101* Mocked in the ''Series/StarTrekTheNextGeneration'' novel ''I, Q''. The Q Continuum has a mortal enemy, the M Continuum. The Ms decided they wanted to go to war with the Qs. Why? Because there is something about them that pisses them off (their exact words). The Q Continuum requested a more eloquent reason. So one of the Ms insulted the mother of one of the Qs. This horrific affront (despite the fact that this Q, like all other Qs, didn't ''have'' a mother) could only be answered by a full scale war.
102* ''Franchise/StarWarsLegends'':
103** ''[[Literature/XWingSeries X-Wing: Isard's Revenge]]'' : The New Republic is picking a fight with the neutral (if admittedly pro-Imperial) Ciutric Hegemony. Prince-Admiral Krennel is obviously not a nice man, but the best pretext the New Republic can come up with for starting the war is Krennel's execution of Sate Pestage several years previously when the latter tried to defect to the Rebellion, which at worst is a case of PayEvilUntoEvil (Pestage was an AssholeVictim), along with Krennel's family (over a hundred people died in that purge alone) and a number of other purges he committed to keep himself in power. Myn Donos notes that one of his former squadmates (in Creator/AaronAllston's Wraith Squadron books) came from Toprawa, a planet deep within Imperial territory that's being repressed much more harshly than the worlds in the Hegemony due to its people's role in the theft of the Death Star plans. Even the generally saintly Admiral Ackbar more or less confesses that going after Krennel is as much about New Republic sabre-rattling to frighten bigger warlords like Teradoc as it about "liberating" the people under his rule (it takes place in the immediate aftermath of [[Literature/TheThrawnTrilogy Grand Admiral Thrawn's invasion of the New Republic]] and the Republic brass doesn't want the remaining warlords getting ideas). And then things get muddled further when the New Republic stumbles upon a hidden lab that they claim proves that Krennel is trying to build another planet-killing superweapon, while Krennel claims that he never knew about the lab and it's obvious a New Republic trick to justify their actions. [[spoiler:He's half-right: the lab is bait for the Republic by a clone of Ysanne Isard who is playing them and Krennel off against each other, and the superweapon indeed doesn't exist.]]
104** {{Discussed}} in ''The Literature/HandOfThrawn''. A number of New Republic member states who are involved in the developing CivilWar over the Bothans' role in the Imperial genocide of the Caamasi only actually care about it because it gives them an excuse to pick a fight with historical enemies (the [[StrawVulcan Diamalans]] and [[HotBlooded Ishori]] are one such example, and are introduced in the first book arguing about something else entirely). The DrivingQuestion of the book is, in the event the specific collaborators cannot be identified, is it justifiable to hold the entire Bothan state/species responsible?
105** The Chiss are only allowed to go to war if provoked (i.e. the other guy has to shoot first), so developing a pretext for preemptive strikes [[BatmanGambit is a veritable art form]] for the Chiss Expansionary Defense Force. The CEDF wanted to take out the marauding [[PlanetLooters Vagaari]] for decades but the Vagaari wisely never attacked any Chiss worlds, so in ''Literature/SurvivorsQuest'' they [[spoiler:trick the Vagaari into attacking a Chiss diplomat (and the Skywalkers)]], then into [[spoiler:hitting a major CEDF base]]. To drive home how seriously the Chiss take their {{Technical Pacifis|t}}m, in the other half of the story, ''Literature/OutboundFlight'', a young [[Literature/TheThrawnTrilogy Mitth'raw'nuruodo]] intervenes in a fight between the main Vagaari fleet and the titular Republic ship (which he had orchestrated with the help of a Republic smuggler). Despite smashing them utterly with a handful of picket ships, he gets exiled for it.
106[[/folder]]
107
108[[folder:Live-Action TV]]
109* This is [[DiscussedTrope discussed several times]] in the mini-series ''Series/{{Attila}}'' (2001). Flavius Aetius presents the young Attila's chief with one of his men who has been tortured as a pretext for taking on a rival tribe. Attila accuses Flavius of having inflicted the torture marks himself as they've been done post-mortem. Later after the chief dies, Flavius warns Attila that he needs a pretext before returning home to take on a rival, so Attila accuses him of murdering the previous chief. After Attila creates the Hunnic Empire, he uses an earlier offer of marriage by the sister of the Roman Emperor (and half their empire as dowry) to invade their territory.
110* ''Series/DoctorWho'':
111** [[Recap/DoctorWhoS27E4AliensOfLondon "Aliens of London"]]/[[Recap/DoctorWhoS27E5WorldWarThree "World War Three"]]: The Slitheen try to gain access to Britain's nuclear arsenal and start WorldWarIII so they can [[WarForFunAndProfit sell]] the radioactive remains of the planet as fuel.
112** [[Recap/DoctorWhoS31E8TheHungryEarth "The Hungry Earth"]]/[[Recap/DoctorWhoS31E9ColdBlood "Cold Blood"]]: Alaya, the Silurian captured by the humans, actually tries to get killed in order to start a war between the two species.
113* In the ''Series/FrontierCircus'' episode "The Shaggy Kings", the renegade Indian Michael Smith tricks Ben and Tony into hunting buffalo on Cherokee lands, and then uses this an excuse to goad the Cherokee into going on the warpath.
114* ''Series/MurdochMysteries'': In "Kommando", Major Cole ordered his squad to kill a British family in the Transvaal to stir up anti-Boer sentiment, before launching an unsanctioned attack on a Boer militia.
115* In the 1996 mini-series ''Rhodes'', Cecil Rhodes is planning to invade Matabeleland, currently ruled by the powerful Chief Lobengula. As he's short of finance, he intends paying his army of mercenaries and adventurers with a percentage of the {{Plunder}} (e.g. Lobengula's land and cattle) but fellow businessman Alfred Beit urges against this policy.
116-->'''Beit:''' Tear these [contracts] up, for god's sake, and pay your men in cash! Have you thought what this means? The moment one volunteer signs this, there's no turning back. You've got to take Matabeleland. What happens if Lobengula won't play ball? ''What if he absolutely refuses to fight?!'' Are you going to take his country, his cattle, regardless? Never mind the British, you'll have the whole world against you.\
117'''Rhodes:''' Don't worry Beit, he'll play ball.\
118'''Beit:''' ''How can you be sure?''\
119'''Rhodes:''' Because I'll ''push'' him, and ''push'' him until he does.
120* ''Series/{{Rome}}'' between Caesar and Pompey in Season One, and Marc Antony and Octavian in Season Two. Both cases involve CivilWar, so it's important that those seeking war not be seen to incite it, as war against fellow Romans is more difficult to justify than war against foreigners.
121* When the Romulans in ''Series/StarTrekTheNextGeneration'' aren't trying to destabilize other superpowers, they're trying to lure the Federation into making some blunder that would justify them making a first strike. They actually got pretty close with Picard and a traitor they were stringing along, but Picard hedged his bets and brought some Klingon backup, so they decided it wasn't worth the risk. Aside from the subterfuge being their [[PlanetOfHats hat]], the Romulans go to such lengths because they don't want to be caught in a two-front war with the Klingons, who are allied to the Federation in this series and would provide assistance if the Romulans outright attacked.
122* The very first scene of ''Series/StarTrekDiscovery'' is a Klingon warlord speechifying to his followers that TheFederation is a threat that must be destroyed. It's part of a GenghisGambit to unite the feuding houses against a common foe. He gets his wish in the next episode when open war breaks out.
123[[/folder]]
124
125[[folder:Radio]]
126* In ''Radio/TheHitchhikersGuideToTheGalaxy1978'', it says that the history of warfare is divided into three phases: retribution, anticipation, and diplomacy.
127** Retribution: "I'm going to kill you because you killed my brother."
128** Anticipation: "I'm going to kill you because I killed your brother."
129** Diplomacy: "I'm going to kill my brother and then kill you on the pretext that your brother did it."
130** There was also the incident where two very tiny alien races were on the brink of war due to a YourMom joke, but what really pushed both parties over the edge was a random comment made by Arthur Dent that traveled through space and time (which happened to be a deadly insult in one of their languages).
131[[/folder]]
132
133[[folder:TabletopGames]]
134* In the ''TabletopGame/{{Warhammer}}'' DarkFantasy universe, Gelebor II, a High Elven King, got into a disagreement with Gotrek Starbreaker, the High King of the Dwarves, over attacks on Dwarven trading caravans at the borders of Ulthuan, the High Elven homeland, that were actually carried out by Dark Elves seeking to inflame tensions between them to the point of war. When Gelebor denied all involvement in the attacks and refused to investigate, Forek Grimbok, one of the Dwarven ambassadors sent to Ulthuan, threatened to hold the entire court of the High Elves responsible if they could not find who among them was responsible, Gelebor got angry and, seeking to preserve his reputation, ordered Grimbok's beard shaved off before throwing him out of Ulthuan. This act was a grave insult to not only Grimbok, but the High King and the entire Dwarven race by extension, and proved to be the LastStraw. The resulting war, which devastated both sides of the conflict, was called the "War of Vengeance" by the Dwarves, but was called the "War of the Beard" by the Elves. It's not advisable to [[BerserkButton call it by the latter name]] within dwarven earshot.
135[[/folder]]
136
137[[folder:Theatre]]
138* In Shakespeare's ''Theatre/HenryV'', Henry announces to the French ambassador that the Dauphin's insulting gift of tennis balls will be repaid with war, but he has already proclaimed his intention to invade France immediately ''before'' the ambassador's entry -- the Dauphin's insult just gives him an excuse.
139* In ''Theatre/KnickerbockerHoliday'', Stuyvesant, GloriousLeader of New Amsterdam, believing that national greatness lies more in guns than butter, suggests that war with Connecticut could be imminent because, he alleges, the Connecticutans have had the cheek to build a fort on the Connecticut River.
140[[/folder]]
141
142[[folder:Video Games]]
143!!By Creator:
144* Creator/ParadoxInteractive's grand strategy games usually require you to come up with a ''casus belli'' before you can declare war on someone:
145** In ''VideoGame/CrusaderKings'' you can have your Spymaster fabricate claims on a neighboring county to justify your expansion, while in ''VideoGame/EuropaUniversalis'' you can similarly find "obscure documents." At other times in ''EU'' or ''VideoGame/VictoriaAnEmpireUnderTheSun'', you might see border incidents like the pig one occur.
146** In ''Crusader Kings II'' this is largely religion-dependent: Christians, Jews, and [[UsefulNotes/{{Zoroastrianism}} Mazdans]] need claims on titles (which can be faked) or [[ChurchMilitant holy war]] justifications to conquer territory (2.8 adds the "border dispute" ''casus belli'', which costs resources to use and incurs an [[RelationshipValues opinion penalty]] from other rulers). Muslims and pagans are free to declare wars for single counties without much consequence (especially [[HornyVikings Germanic pagans]], who can target any coastal county).
147** ''VideoGame/{{Stellaris}}'' has a range of ''casus belli'' based on a star nation's ethics and government type. Normal nations can declare wars of conquest only after spending Influence to stake claims to other empires' systems, while Pacifistic empires can only "liberate" worlds, creating a new nation with identical ethics to their own. You can also declare war to specifically humiliate a nation you've declared your rival, force someone to become your vassal, or impose your ideology upon them. [[AbsoluteXenophobe Fanatical Purifiers]], [[TheAssimilator Driven Assimlators]], [[HordeOfAlienLocusts Devouring Swarms]] and those who [[GodhoodSeeker Become the]] [[ApocalypseCult Crisis]], on the other hand, don't really need a ''casus belli'' to attack a neighbor, and likewise other nations can use the "Contain Threat" justification against them. And just owning a [[PlanetDestroyer Colossus]] is enough to justify another power waging total war against you, or vice versa.
148
149!!By Series:
150
151* ''VideoGame/AgeOfWondersPlanetfall'' and ''VideoGame/AgeOfWonders4'' both use war justification as a game mechanic, called Casus Belli in ''Planetfall'' and Grievance in ''4''. Actions like trespassing in another nation's territory or snatching up territory on their borders will generate points. It's also possible to spend resources to fabricate a pretext for war. Declaring war without justification causes both economic and diplomatic penalties, as neither your own citizens or other rulers are happy with a warmonger. Conversely, declaring war with high justification grants temporary bonuses. [[GondorCallsForAid An ally requesting you declare war on their enemy]] always grants a large amount of Casus Belli / Grievance.
152* ''VideoGame/{{Civilization}}'':
153** PlayedForLaughs in ''Civilization V'' with some leaders' war declarations. UsefulNotes/MahatmaGandhi claims a couple of troops have gone rogue and attacked your border unprovoked, but don't worry, he's sent a StronglyWordedLetter kindly asking them to withdraw. [[UsefulNotes/{{Augustus}} Augustus Caesar]] on the other hand bluntly informs you that "My treasury is emptying and my soldiers are growing bored. Therefore you must die."
154** ''Civilization VI'' introduced ''casus belli'' as an actual mechanic. Invoking one when declaring a war reduces the diplomatic penalties received for being a warmonger in the eyes of other civs. The reduction ranges from minor (being honest about commencing a hostile land-grab) to complete negation (declaring a new war to liberate cities, your own or an ally's, carries no warmonger penalty on its own).
155* In ''VideoGame/DragonAgeII'', TheChurch controls all mages and has them guarded at all time by Templars, who will hunt any mage who tries to flee and kill those who show any signs of becoming vulnerable to demonic possession. Since demons offer powers that help a lot in escaping the templars, this actually happens quite frequently. With the templars taking less risks and even sympathising with those who try to escape being treated as being vulnerable to possession, things are constantly getting more dire for mages, but more moderate factions are always intervening to prevent a complete purge of all mages. In a desperate, though brilliant, move [[spoiler:the mage Anders provides a reason for the templars to start a purge immediately without preparation, in the hope that it will unite the mages to fight for their lives, while there is still a chance they can win. He does that by blowing up the local main church with all its priests and publically admiting to the Templars that he did it. When the Templars than used that as an excuse to purge a Circle that their leader knew Anders was never a part of, the resulting outrage from the other Circles kicked off a full-scale war that would finally force the issue to be addressed.]]
156** However, going with the game's FailureHero theme, it didn't actually work. The rebellion didn't really spread beyond Kirkwall until [[spoiler:a mad Lord Seeker tried to purge the Val Royeaux circle after a mage murdered a Templar, breaking away from the Chantry which had specifically ordered him not to in the process,]] in ''{{Literature/Asunder}}''.
157* ''VideoGame/DragonQuestIII'': One of the Personality-determining scenarios players of the remakes can be presented with is a kingdom that is on the verge of war, courtesy of the Queen convincing her husband that another land has been scheming against them. The hero overhears the Queen [[EvilGloating gloating to herself]] that she made the whole thing up because she coveted the jewelry the other kingdom's queen owns. The player must then decide what, if anything, to do with this information.
158* In ''VideoGame/FireEmblemAwakening'', King Gangrel of Plegia abducts a Ylissean noblewoman he (falsely) claims intruded over his border and uses the deaths of his own soldiers in the rescue attempt as a loose justification for a war of aggression. Everyone present can see it's a total farce, he just needed enough plausible deniability to keep their mutual northern neighbour coming down on him like a ton of bricks.
159* ''VideoGame/GalacticCivilizations 2'' has a random event where people from one civ automatically assassinate a very high-ranking politician of another civ, forcing war between the two.
160* ''VideoGame/{{Humankind}}'' has a more abstract form of this in its War Support. Grievances against other empires aren't themselves a valid pretext, but if demands for reparations go unmet, it builds public support for war. Notably, this also works the other way. When war support hits zero during a conflict, that side is forced to capitulate, and gets no say in the terms.
161* ''VideoGame/MassEffectAndromeda'': The kett initially made peaceful diplomatic overtures towards the angara, then abducted or attacked many of their leaders, claiming the angara fired first. The angara were too busy arguing with one another to notice the holes in the kett story until it was a little too late.
162* Used in ''VideoGame/ModernWarfare2'', where Vladimir Makarov, a major Russian extremist terrorist, perpetrates a massacre in an airport in the middle of Moscow while Private Joseph Allen, an American CIA agent, is planted in his inner circle. However, Makarov knows about Allen, and the Private is killed and dumped in the airport, and his body used as a pretext by the war-happy Ultranationalists to give them an excuse to invade the United States. The fact that as of ''Modern Warfare 3'' [[spoiler: Makarov appears to be covertly in control of the entire Russian military]] helped sell this.
163** This trope is actually active on both the Russian and American sides in different ways. The Russians have been looking for an excuse to go to war with America for years, and are just waiting for a catalyst. Even if the US was completely uninvolved, there's a fairly decent chance they would have blamed the CIA anyway. Indeed, they may have done just that. A well known internationally wanted terrorist is seen, plain as day, strolling into an airport with a machinegun. Even though Allen's corpse is left there, the only thing that would identify him as a CIA agent (or even an American for that matter) is information being fed to the Russian government by a terrorist organization or the game's villain (who are both less than reputable).
164** On the American side, this is also an example of [[spoiler:the "hard-line elements from both sides co-operate with each other" example above, since General Shepherd, commander of the US Army Rangers and Allen's superior, was collaborating with Makarov to start a Russo-American war and planted Allen in Makarov's cell for the sole purpose of BEING the catalyst. All part of his plan to reinvigorate America's military might after the nuclear explosion that killed 30,000 Marines in the first ''Modern Warfare'' pacified it. Naturally, once the war actually kicks into gear Shepherd wastes no time [[YouHaveOutlivedYourUsefulness turning on Makarov]], while simultaneously trying to cover up that he was ever involved with him in the first place]].
165* ''VideoGame/StarControlII'' reveals that the human-VUX FirstContact failed not because the human captain off-handedly called his opposite number ugly, figuring the translators weren't working yet, but because the VUX find ''humans'' too ugly to let live. They simply used the "insult" as a pretext to prepare for war. They were conquered by the Ur-Quan and absorbed as BattleThralls, which only worked in their favor.
166* In ''VideoGame/StarTrekOnline'' the Klingon Empire uses Undine infiltration of the Gorn as an excuse for stepping up their border war with them into a full-scale invasion, and later try to retroactively use the same excuse to justify attacking the Federation (even though they had openly admitted in the {{backstory}} that they were just after territory).
167* ''VideoGame/TrailsSeries'':
168** ''VideoGame/TheLegendOfHeroesTrailsInTheSky'': As a small kingdom to the south with a pitifully small army and an abundance of [[GreenRocks Septium]] ore, Liberl made an easy target for the Erebonian Empire. Unfortunately for said empire, civil unrest among the Reformist and noble factions left the government in a politically sensitive position. To tip the scales in their favor, a small village on the border named [[spoiler:Hamel]] was mercilessly butchered down to the last man, woman, and child. The official story [[spoiler:pinned it on Liberlian soldiers, but in fact were Jaegers in disguise]]. This is why several characters in the overall Trails series have [[DarkAndTroubledPast plenty of trauma to go around]] as a handful of survivors managed to escape. A deciding factor that ended the war was [[spoiler:the condition that no one on either side was to reveal the truth about Hamel]] as an act of truce. The climax of the ''Second Chapter'' reveals that [[spoiler:the main villain Weissman whispered the name to select people to suggest the idea in the first place, which would give him the opportunity to mold whoever survived into the perfect slave for him to control.]]
169** ''VideoGame/TheLegendOfHeroesTrailsOfColdSteel'': Despite the games taking place in Erebonia, the nation responsible for the burning of [[spoiler:Hamel]], the truth of the incident isn't discussed until the third game, which gives more insight into why the incident happened. Commoners were rising up in rank in the Imperial Army, and nobles in the army weren't okay with that. These nobles are the ones [[spoiler:Weissman]] convinces to attack [[spoiler:Hamel]] as a pretext for the Hundred Days War, which they could brag about as an achievement. Gilliath Osborne, a leader in the Imperial Army and one of the commoners despised by those nobles, warns them to not attack [[spoiler:Hamel]]. In response, they hire jaegers to attack his home, leading to the death of his wife and his son [[spoiler:Rean]] being mortally wounded. The only reason [[spoiler:Rean]] doesn't die is because [[spoiler:Osborne makes a DealWithTheDevil to save his son's life]]. Osborne is the one who negotiated with the queen of Liberl and managed to stop the war under the condition that [[spoiler:everyone who knows about Hamel keep quiet about the truth]]. The way Osborne managed to deal with the Hundred Days War won him the trust of Emperor Eugent III, who responds by making him the first commoner-born chancellor in Erebonia's history. This serves as the StartOfDarkness for Osborne, who would go on to become the EvilChancellor and BigBad of the Cold Steel games.
170** In the third ''Cold Steel'' game, [[spoiler:Emperor Eugent]] is shot by [[spoiler:a survivor of Hamel]]. Osborne uses the fact that the ''gun'' was from Calvard as a pretext to declare war against them, something anyone with half a brain knew he'd been prepping for for at least a year.
171* In ''VideoGame/TriangleStrategy'', Dragan's death [[spoiler:as part of a FalseFlagOperation]] is used by Gustadolph as a pretext for the Aesfrosti to invade Glenbrook and take control of the Grand Norzelian Mines.
172* In ''VideoGame/WarPips'' you, the general of the Piponian invasion force, are tasked with "liberating" the Oiyelistan people from their petroleum reserves and [[ArsonMurderAndJaywalking their unholy custom of putting water on their cornflakes instead of milk]].
173[[/folder]]
174
175[[folder:Webcomics]]
176* One arc of ''Webcomic/EscapeFromTerra'' revolves around the United World trying to incite an incident on Ceres that they can use as a pretext for a second invasion attempt (first time they claimed Ceres was rebelling, the natives made it clear Ceres was never part of the UW in the first place). First a few covert ops soldiers go in and try to start a bar fight, but due to the Zero-Aggression Principle most Cereans follow that doesn't work. Then those guys buy a hotel and a small platoon of troops move in, but the locals just accommodate them. And as a last ditch the commissar took a twelve-year old girl hostage and told a prominent local to shoot one of her men disguised as a tourist or the girl would die. [[spoiler: The Cereans instead brought out strippers to distract everyone until they rescued the kid, and the soldiers turned on their political officer.]]
177[[/folder]]
178
179[[folder:Web Original]]
180* ''VideoGame/ImperiumNova'' has a {{feud|ingFamilies}} system. When one House engages in actions against another House such as withholding taxes, insulting dynasty members, espionage (and are caught), or attacking facilities; the offended House gains feud points that can be spent attacking the offender. If a House attacks another House, on a planet under Imperial Jurisdiction, without feud the Emperor declares them a Renegade, which allows every other House to attack them with impunity.
181* In ''LetsPlay/{{Mahu}}'''s "Second Chance", the Galactic Commonwealth's many wars each start with a different pretext. From stopping the genocide of a whole race at the hands of fanatics, to stopping the expansion of an ever-hungry Hive Mind, the Commonwealth never goes to war without reason. However, it is also argued by some of the nation's neighbours and rivals that these reasons sometimes just look like convenient excuses to expand the nation's frontiers and gain more resources.
182* In the ''Literature/NewDealCoalitionRetained'' timeline, a firefight at the inter-German border in 1988 -- caused by overzealous West German guards stepping in when the East Germans execute refugees attempting to flee across the border -- serves to set off the powder keg that international relations have been ever since [[TheCoup the December Coup]], sending the world spiraling to WorldWarIII. [[spoiler: Which is what the hardliners in Moscow want, as they see war as the only way to revitalize their economy. Hence why they sabotage diplomatic efforts to soothe matters by giving demands they know the West will reject.]]
183** A few years after WWIII's end, a skirmish along the border between the Chinese and Japanese occupied regions of Manchuria is seized upon by General-Secretary Li Peng as an excuse to act on his anti-Japanese policies and go to war with them. Despite the propaganda spouted about it, absolutely no one is fooled about the actual reasons for the war.
184** A South African state police force chasing Lozi separatist terrorists is drawn into a firefight with an [[TheAlliance Entebbe Pact]] peacekeeping force at the Lozi (formerly Zambia) border, leading to a tipping point in the escalating tensions between the Pact and the French Concordat-aligned nations of Africa, triggering an all out war.
185** The ceasefire among the various factions in the Brazilian CivilWar is broken when a commercial plane from the Estado Novo portion of the country is destroyed, apparently by a rocket launched from Republican-held territory, leading to the Estado Novo declaring war on the Republicans. In response, the Communists and Amazonian militants come to the Republicans defense, and soon other South American countries are also entering the war on both sides.
186* ''WebVideo/WorldWarTwo'':
187** The German justification for their invasion of Poland stemmed from, among other causes, {{False Flag Operation}}s by German operatives designed to look like Polish aggression against Germany.
188** Belgian King Leopold III tried to avoid giving Germany a reason to invade by refusing to allow British and French forces to take positions inside neutral Belgium during the "Phony War". It didn't work -- Hitler invaded Belgium and the other Low Countries anyway in 1940 in order to clear the way to invade France by using the Ardennes Forest and the French/Belgian border to bypass the Maginot Line along the French/German border.
189** The Soviet-Finnish Winter War began on the pretext of an artillery attack by Finns against the Russian village of Mainila despite Finland having withdrawn its artillery from the border to prevent such an incident.
190[[/folder]]
191
192[[folder:Western Animation]]
193* In ''WesternAnimation/DragonsRidersOfBerk'', [[MeaningfulName Dagur the Deranged]] visits Berk, having heard a rumor that they have taken to training dragons. It is heavily implied that Dagur wants to use that fact as an excuse for the Berserker tribe to wage war on Berk as he has his entire armada just offshore.
194* ''WesternAnimation/AThousandAndOneAmericas'': Near the end of the seventh episode, it is revealed that Balam faked the theft of a sacred mask to frame a neighboring tribe in order to start a war against them and eventually conquer them. Chris, Lon and a friendly priest manage to retrieve the mask and expose Balam's sordid plan before anything terrible happens.
195[[/folder]]
196
197[[folder:Real Life]]
198* That pig thing, in the trope description? [[https://en.wikipedia.org/wiki/Pig_War_(1859) It was real.]] It wasn't much of a war, though: "The pig was the only casualty of the war, making the conflict otherwise bloodless." from Website/TheOtherWiki. The situation was defused largely because the commanders of both sides flatly refused to fight over something so stupid.
199* [[http://en.wikipedia.org/wiki/War_of_Jenkins%27_Ear The War of Jenkins' Ear]]. The British had managed to get themselves exclusive rights to trade slaves in the Spanish colonies in America, but at the cost of Spanish crews being allowed to board British ships and search their cargo. Relations became rather strained, and then a one-eared merchant captain by the name of Jenkins showed up in Parliament with a severed ear and a story of Spanish brutality that sparked the above war. It is doubtful as to whether the ear exhibited in Parliament was actually Jenkins' lost ear, as historians today and his contemporaries believe that he lost his ear in a bar fight years before.
200* UsefulNotes/WorldWarI:
201** The assassination of the heir to the Austro-Hungarian throne, Archduke Franz Ferdinand, by "Serbian terrorists" (actually a group including Serbs, Croats and Bosniaks, but authorities painted the plot as entirely Serb-run) sponsored by the head of Serbian military intelligence to further the goal of Serbian dominance of the Balkans was used as an excuse to take down Serbia's racist military Junta and replace it with a government which ''didn't'' sponsor terrorists (even during the war there was no question of annexing Serbia, as doing so would only have added to Austria-Hungary's domestic political problems). Which sounds a bit unreasonable until you realise that the very existence of Serbia (an independent nation-state of ethnic Serbs whose sole foreign policy goal was to unite all the lands inhabited by Southern Slavs into Yugoslavia, which they envisioned as as a Greater Serbia) terrified the German/Hungarian elites that ruled the mindbogglingly multi-ethnic Austria-Hungary. Right from the start, they thought that, with Germany backing them all the way, Russia would back down rather than risk war with them ''and'' Germany at the same time, just like six years earlier over the formal annexation of (Habsburg-occupied, technically Ottoman) Bosnia. For reference, the main ethnic groups in Austria-Hungary were, roughly by population: Germans, Hungarians, Czechs, Poles, Ukrainians, Croats, Slovaks, Serbs, Slovenes, and Italians. Plus a lot of Jews, most of whom spoke German/Yiddish or Hungarian.
202** Furthermore, right from the start, the German High Command's accepted plan of action was to use ''Aufmarsch I West'' (formerly ''Aufmarsch II West''), deploy 80% of the army in the west to invade France through Belgium and attempt to encircle a large part of the French Army on French territory (failing that, they'd still end up occupying economically important French territory). So when Russia mobilized its armies, Germany delivered an ultimatum to France as a pretext for war, demanding its neutrality despite being an ally of Russia and asking it to temporarily surrender fortresses integral to France's defenses (Verdun and Toul) along their shared border within 24 hours. The French didn't respond but mobilised the next day, as did the Germans; since about 1911 the ''Revanchism'' movement, a movement seeking revenge for France's defeat in the Franco-Prussian War and the re-annexation of the province of Elsaß-Lothringen (Alsace-Lorraine) had become a dominant force in French politics and was not to be denied. More importantly, the French felt that this was an excellent time for a war: deadlock in the German and Austrio-Hungarian parliaments meant they hadn't increased their military spending and thus capabilities to match the 1905-1914 Franco-Russian increases, but that was set to change in the near future. Moreover, the French did not feel they could count on Russian support in a war that mostly or only involved French (and not Russian) interests. Serbia was a cause that Russia was willing to fight for, and the French might not get another chance like it again.
203* The [[http://en.wikipedia.org/wiki/Shelling_of_Mainila Mainila incident]], which the Soviet Union used as a pretext for invading Finland during the Winter War. It has been established that there is no way the Finns could have been responsible, as none of their artillery was in range at the time. A few months later, the Soviets started claiming that the Baltic states captured and are torturing some of their soldiers. Remembering Finland, all three countries agreed to join the USSR. No attempt to find the captive soldiers followed.
204* Similarly, the [[http://en.wikipedia.org/wiki/Gulf_of_Tonkin_incident Gulf of Tonkin incident]], in which an American ship on patrol claimed to have been attacked by Vietnamese gunboats, serving as a pretext for UsefulNotes/TheVietnamWar; but the reports may have been fabricated to gain popular support for escalating military operations in Southeast Asia.
205* To make a trifecta, the sinking of the ''[[http://en.wikipedia.org/wiki/USS_Maine_%28ACR-1%29 USS Maine]]'' in Havana Harbor provided America with the perfect excuse to start the UsefulNotes/SpanishAmericanWar and take over Cuba and Spain's Pacific possessions. Investigations since then seem to be split on whether it was a deliberate act of war by the Spanish, a FalseFlagOperation by Cuban rebels, or a genuine accident caused by a fire in a coal bunker. It didn't help that the American press was actively encouraging war with Spain by citing (false) Spanish atrocities. Why? [[IfItBleedsItLeads To increase their sales figures]]. Not that there weren't perfectly real atrocities being committed by Spain in its attempt to suppress a Cuban Revolution-- including the first documented use of what the Spanish called "Campos de Concentración". Unlike the later (euphemistic) use of the term by the Nazis, those were ''supposed to be'' "only" internment camps to hold the civilian population in order to deprive the guerillas of support. They were however guarded by armed Spanish soldiers, had barbed wire, and (due to military corruption) were insufficiently provisioned and disease-riddled, leading to horrific death tolls-- even if the claim that it was due to incompetence or carelessness rather than a deliberate policy of murder is somewhat more credible than in later cases. Only a few years later, the same American public who had been outraged at that treatment of the Cuban civilian population didn't care in the slightest about the ''very similar'' methods the US used to suppress the uprising of the Filipino population (the Phillippines having been acquired from Spain as a result of the war).
206* Another FalseFlagOperation was the Mukden Incident of 18 September, 1931, in which the Japanese officers faked an explosive attack on the South Manchurian railroad to spark off the Manchurian Crisis.
207* Another escalation of the Japanese war in China started with a Japanese soldier peeing in the woods. [[NotMakingThisUpDisclaimer Seriously]] -- he missed roll call after training while taking a leak, and his commanding officer challenged a nearby Chinese patrol, thinking the man might have been abducted or attacked by the Chinese. Tempers flared and somebody (from which side is not known) opened fire. Things were nearly smoothed over by the local commanders, but the Japanese Army high command refused to de-escalate as they had been looking for any old pretext to expand into more of China anyway.
208* The revolution that led to the Republic of Colombia becoming independent was supposedly triggered by "El Florero de Llorente" (the vase of Llorente), which was a trick by the supporters of the independence to upset a Spanish merchant and incite the crowd against the Spanish people. This led to a popular expression used when you need a excuse to start a fight.
209* The [[http://en.wikipedia.org/wiki/Gleiwitz_incident Gleiwitz Incident]] was used as a pretext for Germany's invasion of Poland in 1939. An SS commando team in Polish uniforms attacked a radio station near the Polish border and broadcast anti-German propaganda. They even dressed a prisoner in a Polish uniform and shot him to add authenticity. Even before that, during the summer of 1939, the Nazis staged attacks on ethnic Germans in Poland, claiming this was the work of Polish terrorists. This allowed Hitler and the Nazis to paint their invasion of Poland as an act of self-defense. Nobody outside Germany bought it, with France and the United Kingdom declaring war on them within a few days.
210* The [[http://en.wikipedia.org/wiki/Football_War Football War]] had a ''football match'' as part of its pretext.
211* Lampshaded in the [[http://en.wikipedia.org/wiki/Louisiana_Maneuvers Great Louisiana Maneuvers]] of 1941. These were held to [[TeachMeHowToFight prepare the US Army]] for their widely expected entry into UsefulNotes/WorldWarII, and in a way marked the beginning of the United States as a superpower. Two trumped up factions called the Red Army and the Blue Army were set to test their prowess against each other. To begin the contest, it was decided that they represented two nations fighting for control over the Mississippi River.
212* There's a conspiracy theory that 9/11 was a FalseFlagOperation by the Bush administration in order to provide a pretext for invading Iraq. Leaving aside the part where [[http://www.cracked.com/article_15740_was-911-inside-job.html the whole thing started life as a work of fiction]], the correct response for someone too bored to counter with hard data is to invoke the names of {{Occam|sRazor}} and {{Hanlon|sRazor}}.
213** FalseFlagOperation aside, there is compelling evidence to suggest that 9/11 was used to justify a first-strike in Iraq for reasons varying from personal (such as removing Saddam Hussein from power) to financial (such as [[CorruptCorporateExecutive taking all of Iraq's oil and getting filthy rich]]).
214** 9/11 aside, the main pretext for war as sold to the public was the Iraqi government failing to hand over its hidden chemical weapon stockpiles; it was later determined that no such stockpiles existed.
215** An alternative conspiracy theory holds that al-Qaeda were the perpetrators, but claims the government knew the attack was coming and did nothing to gain an easy pretext. Another unrelated theory says that either UsefulNotes/FranklinDRoosevelt or UsefulNotes/WinstonChurchill was aware of the impending Pearl Harbor attack and let it happen for the same reason.
216* UsefulNotes/TheCrimeanWar started thanks to a dispute between Catholic and Orthodox clergymen in Bethlehem (present-day Israel, then part of the Ottoman Empire) over the keys to the Church of the Nativity. This led to the awkward situation of Catholic France, Anglican Britain, and the Catholic but anti-Pope Kingdom of Sardinia siding with Muslim Turkey against Orthodox Russia over a religious argument. They had the very open goal of unifying Italy, which would necessarily include annexing Rome ([[SeriousBusiness as no Italian would accept another city as capital except as a temporary measure]]), and since the reigning Pope was opposed to a federation, that meant Sardinia would eventually go to war with the Pope.
217* In the runup to the Six Days War, Nasser was either intentionally provoking Israel or blustering to look tough. First he called for an end to the UN mission acting as "buffer" between Egypt and Israel in the Sinai, then he started mobilizing troops, ostensibly in preparation for war - all while saying stuff like "We'll destroy Israel" on the radio - and ultimately he closed the Straits of Tiran (Israel's only access to the Red Sea and of crucial importance for Israeli trade with Asia), which Israel had ''repeatedly'' said would be [[ThisMeansWar grounds for war]]. Guess what happened?
218* In perhaps one of the most poorly thought out attacks in history, the Japanese attack on Pearl Harbor during World War II was intended to scare the US into remaining neutral rather than joining the Allies. Of course, the US had been aiding the Allies with supplies for years at that point and had been desperately searching for a reason to justify entering into the war in a military capacity. This was less about justifying it internationally -- the other Allied forces were happy to have the US join the fight and would not have complained regardless of the pretext -- and more about justifying it domestically, since public opinion within the US was fairly split about whether they should enter the war. Then the Japanese attacked, and any resistance to joining the war evaporated, as now it would look worse NOT to retaliate. However, the idea that it was meant to "scare" the US is historically suspect. Pearl Harbor was ''far'' from the only objective; coordinated attacks over the course of a few hours (all at local dawn) basically swept Allied forces from the Pacific in a single stroke, including taking the US territory of the Phillipines and eliminating American air power in the Pacific with it.
219* When Germany declared war on the United States a few days after Pearl Harbor, Hitler held a speech where he recapped a long list of alleged or real American aggressions and war crimes against Germany and her Axis allies in the previous years. His main complaint was that the US Navy had attacked German naval and merchant marine vessels several times in the months prior to Pearl (which was [[https://en.wikipedia.org/wiki/USS_Greer_(DD-145)#The_Greer_incident,_September_1941 actually true]]). The complete list of ''casus belli'' he invoked can be read [[https://www.jewishvirtuallibrary.org/hitler-s-speech-declaring-war-against-the-united-states here]].
220* Pennsic, the Society for Creative Anachronism's annual simulated-warfare camping event, got started when Cariadoc of the Bow declared war on ''himself''. While serving as King of SCA's kingdom in the Midwest, he sent a challenge to war to the then-king of the Eastern seaboard, who laughed it off. Not long after, Cariadoc moved to the East coast in RealLife, where he ascended to become King of the East; a new incumbent was elevated to "rule" the Midwest. Digging up the challenge he'd previously issued, he feigned outrage at the taunts ''he'd'' written himself, raised the call to "War" against his former kingdom, mustered his forces to battle those of his Midwestern successor at the border in western Pennsylvania... and ''lost''.
221* The ancient Romans believed their gods looked unfavourably at wars of aggression. Somehow, over the centuries, they were provoked by hostile neighbours - or aiding their beleaguered allies - into conquering their way from a single city to an empire spanning over several continents. The UsefulNotes/PunicWars are a good show at what Rome would lower itself to in pursuit of a pretext:
222** The First was caused when the Mamertines, mercenaries that had previously worked for Syracuse, occupied the city of Messana (modern day Messina) and requested help from both Carthage and Rome. Carthage acted first, pressing Syracuse into letting the Mamertines go and garrisoning Messana, at which point the Roman Senate, which had been aiming to expand in Sicily for a while, decided to ''not'' go to war, as Carthage was an ally, and the request was already sketchy to begin with, due to the Mamertines having stolen the city from its rightful owners to begin with... Then warmongers in the Senate put the decision in front of the Centuriate Assembly, the one organ that, as the popular assembly, had ''more'' power than the Senate and held out the prospect of plentiful booty, at which point the merchants that would benefit from said booty decided to accept the request, much to Carthage's rightful indignation.
223** After Rome won the First War, Carthage's influence zone in the Iberian Peninsula was limited to the area south of the Ebrus river... And ''then'' Rome made an alliance treaty with Saguntum, a prosperous and well fortified city right in the Carthaginian influence zone. A few years later, Hannibal, knowing that Saguntum would be an enormous threat, conquered it, and Rome declared war.
224** After losing the Second Punic War, Carthage was banned from declaring war on anyone without the permission of Rome, a ban that the Romans considered eternal unless a new treaty said otherwise but the Carthaginians considered bound to expire as soon as they had paid the enormous war indemnity. Thus Carthage did not react to Numidian aggression for ''fifty years'', begging Rome for redress or at least permission to counterattack the whole time, and only raising an army after they paid the indemnity and thus considered the treaty expired. The Numidians crushed the Carthaginian army at Oroscopa, and the Carthaginians, realizing the Romans did ''not'' consider the treaty expired, executed their general as penance and sent embassies to effectively beg for forgiveness, but Rome, who didn't want the commercial competition and had factions that used Carthage as a political boogeyman, eventually declared war. When the Romans arrived at their African allied harbor of Utica, Carthage sent a last embassy, to whom the consul Censorinus demanded they handed over all weapons. Carthage brought to Utica all their weapons ''and'' their military fleet just to stay on the safe side... At which point Censorinus demanded the Carthaginians relocated 16 km away from the sea. The Carthaginians recalled their ambassadors and started rebuilding their weapons and ships, and the Romans attacked.
225* When Russia invaded Ukraine in 2022, they claimed it was to stop NATO eastward expansion... except Ukraine was not in the process of joining NATO, only sending in an application after Russia annexed four occupied oblasts. On top of that, NATO had never made any official binding agreement not to expand eastward, despite repeat claims by Russian propaganda that they had. Then they claimed it was to de-Nazify Ukraine... except Ukraine's president is Jewish and far-right parties have minimal support, and neo-Nazis were seen among the Russian invaders (though non-Russians are far more likely to call bullshit; Russia's PropagandaMachine [[https://www.theguardian.com/world/2022/may/06/how-victory-day-became-central-to-putin-idea-of-russian-identity heavily downplays the Nazis' antisemitism]], instead defining the Nazis purely by the fact that they invaded the Soviet Union and by extension Russia, and apparently extending that to mean ''all'' opponents of the Russian Federation are Nazis). Then they claimed it was to stop Ukraine from gaining nuclear weapons... which they weren't. Later, they claimed it was to "de-Satanize" Ukraine... except '''87.3%''' of Ukrainians identify as Christian, largely Orthodox. Needless to say, Russia has yet to provide a halfway convincing reason for invading. Ironically, both Sweden and Finland quickly announced their intention to join NATO shortly after the war began.
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