Storm Shadow: So why do you keep [the mask]? James McCullen: So that I never forget the most important rule in dealing arms. The Baroness: Let me guess: 'Never sell to both sides'? James McCullen: Never get caught selling to both sides.
In any war, there are those that will benefit from the fighting and destruction that it causes. This trope is about when somebody realises this and dupes or manipulates a couple of different groups into fighting each other so that they can turn the chaotic scenario to their advantage.
They could be plotting to take over one of the factions once the war's finished. They could be trying to get one side to change from being a neutral party into an ally or perhaps they are trying to use the situation to look good, making the outsider seem like the reasonable party for their involvement in the conflict. Maybe they just want to use the war as a diversion so they can carry out their own plans. There are many ways to benefit, but the crux of the trope is that there is a conflict and somebody has plotted to make that conflict for their own benefit.
Supertrope to Divide and Conquer, which is specifically getting groups to fight to wear each other down so that the plotter can conquer them more easily, and War for Fun and Profit, when someone plans to make money and/or gain amusement from the conflict. Related to the Batman Gambit, since this trope will often rely on some behaviour predictions and Flaw Exploitation and the Kansas City Shuffle because such a plan is very dependent on misdirection. If the planner can still benefit by the misdirection failing, then it could be a Xanatos Gambit. Reference the Fox in Dying Like Animals.
This is a risky Evil Plan to attempt, but not without backup perks. Should one side realize they're being played, they could turn against the manipulator, who in turn could "ally" himself with the remaining side for safety purposes. It would also continue to perpetuate the conflict while the manipulator prepares to reap the rewards (best-case scenario) or get out of dodge (bad scenario).
An even rarer collapse involves both sides catching on and deciding that life would be better without the manipulator. This worst-case scenario is usually solved with the manipulator getting as far away from the now-incensed ex-pawns as possible, if such a possibility is available. If not, the manipulator will likely succumb to the temptationto cancel their own subscription to life.
If a leadership of both sides is Playing Both Sides, that's Running Both Sides.
Overlaps with False Flag Operation.
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Anime and Manga
Ghost in the Shell: Stand Alone Complex: Kazudo Gouda plays both sides to incite rebellion in the refugee population of Japan and overthrow the Japanese Government. People would be brainwashed into suicide terrorist attacks on the refugee, then the phenomenon of "Blame the victim" would be stirred up in the main population to bring up resentment against the refugees. Eventually the refugees would be tricked into making an attack to cause the government to hit back and shift to an isolationist and militaristic policy.
The plot of the Digimon Frontier movie was this. The villain started a race war to get humanoid Digimon to fight animalistic Digimon to unseal an evil in a can. Notably, the villain was able to pose as the leaders of both military factions.
Transformers Armada: Sideways, working for Unicron, who is manipulating the conflict between the Autobots and Decepticons in order to encourage the hatred and anger of both parties so that Unicron can feed on it and become reborn. The Mini-Cons themselves, supposedly the all-powerful MacGuffins of the series, were specifically created so that the Transformers would fight over them.
Bahbem was playing both sides of the Human/Mulian conflict in RahXephon. He helped the Mu develop their Dolems and find ways to work around the dimensional barrier, whilst also setting up TERRA to fight off any Mulian incursions. He didn't really care which side won, as long as it created an environment that would get the RahXephon to activate.
Gundam: Anaheim Electronics from the Universal Century timeline is a milder example; they don't try to start wars, but they're more than willing to sell their mobile suits to both sides in a conflict, regardless of any sort of moral complication (like say, the fact that the people they're selling to want to kill half the human population). A prime example of this comes in Gundam 0083: Anaheim builds three Gundams for the Earth Federation, then gladly sells the fourth (modified to look like a Zeon MS) to the Delaz Fleet after the Federation passes on buying it. A partial justification comes in the background info, which says Anaheim absorbed Zeon's old MS development firms after the One Year War, and thus has many members who are still loyal. This attitude of theirs is a major reason the Federation eventually creates SNRI, their own in-house Mobile Suit production company, so they don't have to rely on Anaheim exclusively.
Haman Karn near the end of Zeta Gundam. When Axis Zeon makes a surprise return in the midst of the Gryps Conflict, both the AEUG and Titans try to get her to join their side. She ends up playing the two against one another so that they'll wipe each other out, leaving Axis as the dominant power in space. It works, which leads to the events of Gundam ZZ.
In the anime version of Soul Eater, Medusa resurrects the Kishin Asura, who then is coaxed into helping Arachne. Medusa then sells Asura's location to the DWMA, so that the two sides will fight and weaken each other without her lifting a finger. Played with when Eruka later points out that both sides were so powerful that Medusa never stood a chance against either.
In the second half of SD Gundam Force, we learn that Deathscythe the Knight of Darkness was manipulating both the Dark Axis and the Royal Knights during the invasion of Lacroa.
Doctor Doom had one where he manipulated two countries, an Aesir worshipping one and Slovakia into a tense state. He then exacerbated things by splitting allegiances within the Avengers on the issue; Thor took the side of his worshippers and the others felt this was wrong of him and sought to oppose him. Then Doom gave Slovakia weapons to attack the other country but then used this as a pretext for his country, Latvaria which neighboured the other two, to intervene (i.e. invade) since the Avengers could not do so unbiasedly.
One of Batman's Gambit Roulettes blew up in his face when Stephanie Brown tried to implement it to prove herself after he fired her as Robin. This led to the War Games storyline, wherein Gotham City was consumed in a Mob War that set almost all the city's gangs against one another. Almost all of them-Black Mask stayed out of the melee, fanning the flames until most of his competition had exhausted themselves before he finally struck and united all of Gotham's gangs under his own leadership.
Happens a couple of times in Spy vs. Spy. The Grey Spy would often sucker White Spy and Black Spy into fighting each other, sometimes over her affections, and usually profit from it by either offing both of them, stealing the MacGuffin out from under their noses, or swindling them both with shoddy war materials.
In With Strings Attached, John lures a whole bunch of skahs warriors to the Abandoned Warehouse where the Uneasy Alliance of Brox and Co. and the Raleka wizards have stashed the Vasyn. The skahs promptly attack the Raleka guarding the warehouse in an attempt to get in, and the resultant chaos on the ground allows John and Ringo to make the attempt to sneak in via the roof.
In Blue Thunder, the heroes discover a conspiracy inside the U.S. government to stir up problems in the Los Angeles barrios by inciting racial tension between whites and Hispanics. They intend to prove the value of the title helicopter by using it to suppress the resulting violence.
The Clone War in the Star Wars prequel trilogy has this at the core of its Evil Plan. The early stages of the conflict get Naboo's ambassador to the Senate, Palpatine, made into its new Chancellor. Then the escalation prompts the Senate to give Palpatine emergency powers to deal with the Separatists. Of course, should he fail to do so, it's no skin off his back as he's leader of the Separatists too.
Yojimbo: This Akira Kurosawa film, one of the most classic examples of this plot, involves a wandering ronin who, coming across a town dominated by two rival criminal factions, engineers an Enemy Civil War between them, at least partially for kicks.
Tomorrow Never Dies: This is exactly what Elliot Carver's plan is. He intends to use the impending war between Britain and China to gain exclusive broadcast rights in China for himself, deliberately amping up the tension himself the entire time. The plot is not uncommon in James Bond films: it's also SPECTRE's plan in You Only Live Twice, Stromberg's plan in The Spy Who Loved Me (in both cases to start a nuclear conflict between the US and USSR), and Koskov's plan in The Living Daylights (getting the British and Soviet intelligence agencies to duke it out while he gets away with his scam).
In Lord of War, arms dealer Simeon Weisz criticizes Villain Protagonist Yuri Orlov for selling weapons to both sides in several conflicts. Orlov points out that Weisz did the same in the Iran-Iraq War, prompting the latter to reply that he wanted "both sides to lose".
Mentioned in G.I. Joe: The Rise of Cobra, when James McCullen discusses his ancestor who was locked in an iron facemask after being convicted of selling weapons to both sides (which we actually saw in the film's prologue).
This is Killian's objective in Iron Man 3: if he controls both the world's greatest terrorist (the Mandarin) and the world's greatest superpower (the USA through its vice-president and soon to be president), he effectively controls war and can make a lot of money.
Caleb Trask, in East of Eden took part with his businessman friend Will in war profiteering, buying beans for two cents a pound over fair market value, establishing a monopoly, then selling those beans for more than ten cents a pound over market value several weeks later in the heat of World War One.
In Neil Gaiman's American Gods, the Batman Gambit Odin and Loki have been working on together is to goad the home-grown modern gods into fighting the immigrant gods to the death, so both Odin and Loki could feed off ensuing battle.
In David Edding's The Belgariad, Nyissa attempts to do this. They feel threatened by the impending war between the super powers on either side of them, and so try to keep in the good books of both sides in order to switch to the winning team and therefore survive.
Comrade Death, a short story by Gerald Kersh, features an Arms Dealer who specializes in this. There are two separate scenes of him selling weapons to one nation only to turn around and sell countermeasures to their enemy immediately after. Ultimately, his company becomes a monopoly and wars fought are entirely supplied by him.
The Dragaera novel Jhegaala appears to be inspired by Red Harvest and involves former-assassin Vlad returning to his hometown and finding it a nasty, corrupt place. The two groups responsible for this are a coven of witches and a merchant's guild, and Vlad ultimately plays the two against each other to destroy them both.
Byerly Vorrutyer in A Civil Campaign is conspiring with both the Richars, and Dono sides in the struggle for who inherits the Vorrutyer Countship, (and telling both sides that he's their spy in the enemy camp.) Whose side he's really on doesn't really become clear until the end.
In The Vor Game, the vampish Commander Cavilo is obviously playing all sides against each other, and sends Miles back to the Dendarii fleet in the belief that he'll do the same with the pro- and anti-Miles factions within the command structure there. Miles has trouble figuring out who Cavilo is really working for; he discovers that it was going to be the Cetagandans, but in the end, she's really only in it for herself.
The title character of Mara, Daughter of the Nile decides to do this when she finds herself being maneuvered into being a agent of two opposing sides. Then she starts Becoming the Mask and everything starts falling apart.
The Gentleman from Adam-Troy Castro's Sinister Six trilogy has spent most of his life doing this, calling himself an investor in chaos.
Live Action TV
In Buffy the Vampire Slayer season 4, the part-man, part-demon, part-robot Adam incites violence between soldiers and demons in order to get a big pile of body parts for making more monsters like himself.
In the "Pillows And Blankets" episoce of Community Jeff gives a Rousing Speech to one side of the conflict that lifts their morale and prompts them to go on fighting. We then find out that he gave the same speech to the other side. As long as the conflict is going on, classes are suspended and Jeff does not have to do any school work.
Criminal Minds once featured a Charles Manson expy who intended to spark a race war between Caucasians and Native Americans.
In the Doctor Who serial "Frontier in Space", the Daleks exacerbate tensions between Earth and the Draconians, hoping to spark a war that will weaken both sides and allow the Daleks to conquer both empires.
Farscape: In season 4, Crichton and his shipmates incite a riot between the techs (Kalish) and soldiers (Charrids) of the bad guys (Scarrans) to cover their escape.
In the Modern Family episode "The Last Walt", Haley asks Gloria if she can have a pool party at their house. She overcomes Gloria's resistance by saying she'll have "her uncle" chaperone. Gloria's son Manny, who technically is Haley's uncle even though he's younger than her, only finds out he's the chaperone when the party starts.
In Supernatural's season 7 finale, Crowley plays the Winchesters and Dick Roman against each other, ensuring that he's the season's only true victor. It works; by the time the finale's over, Roman's dead, and the Winchesters are divided and powerless.
In the The X-Files episode "Kill Switch", the AI sets up two rival drug gangs to have a shoot out in order to kill the real target, the hacker trying to get at the AI. And that's the AI's sense of humor.
Tony Almeida does this in the seventh season of 24 by first working with the heroes and later the villains all in his attempt to get close to the season's Big Bad and kill him in revenge.
Chaos God Tzeentch from Warhammer 40,000 definitely qualifies. Although all 4 Chaos gods want to destroy the Imperium, enslave all life, and so on, Tzeentch will often hatch schemes through his followers, then betray said followers. Just because it's fun.
Genesteeler cults too: They usually infiltrate and manipulate both the government and dissident groups to cause a continuous world-wide civil war until the hive-fleet arrives.
In Grand Theft Auto III, Donald Love has the player incite a gang war between the Colombian Cartel and the Yakuza in order to bring down real estate prices. In Vice City, Avery has Tommy do the exact same thing between the Haitians and the Cubans, with Donald taking notes (they even use the same wording).
Bully has Gary orchestrating a massive, all-out brawl with simultaneous Jocks vs. Nerds and Preps vs. Greasers conflict, which was made possible by his earlier plan to pit the Townies against the Academy kids and frame Jimmy for everything they did.
Halo has two sets of enemies that will happily fight each other. It is possible to engineer a situation where one side narrowly beats the other, allowing Master Chief to mop up the remaining forces.
Iji: in several sections of you can take advantage of fighting between Tasen and Komato forces.
Fallout2: Few encounters are as pleasant as the ones where you meet two groups of gangsters fighting each other. Stay out for the first part, attack one side if it's winning too easily, then wipe out the other side afterwards. Then loot the large number of powerful weapons they drop.
Two of the four endings in Fallout: New Vegas revolve around this. When siding with either of the local superpowers, the New California Republic or Caesar's Legion, the player averts this trope. When siding with Mr. House or going rogue, pitting the militarily superior NCR and Legion against each other becomes instrumental. In Mr. House's case, he also wants to make sure that the NCR's defeat is mitigated, as he needs their tourism for his own economy.
The Doom series has monsters that are programmed to fight one another if you can get them to either blast/wallop each other or if you splash them and trick them into fighting other demons. This allows a player to clear seemingly impossible scenarios, like the room with the Cyberdemon and 18 Barons of Hell. Additionally, some monsters just plain don't like each other, such as the Baron of Hell and the Cacodaemon, a feud lampshaded in the original Doom.
Last Scenario and Exit Fate: SCF clearly likes this trope. Both of his freeware RPGs involve it in some fashion.
In Modern Warfare 2, General Shepherd deliberately engineers a war between the USA and Russia to make America stronger by giving them an enemy to unite against.
In Far Cry 2, the Jackal is engineering a conflict between the two rebel factions by selling weapons to both sides. He isn't trying to make money from this, though. He wants the factions to fight each other so that neither of them will attack the country's civilians while he helps them escape.
The first part of Tales of Vesperia revolves around two villains trying to start a war between the Empire and the Guild Union. Though they war is narrowly averted, the tension between the two factions remains a plot point for the remainder of the game.
In Mercenaries, it's generally work for all of the factions, to maximize the amount of money you get and vehicles you can buy. It becomes a careful balancing act once the factions you work for want each other dead.
In Silent Storm, when the player first encounters Thor's Hammer, they are supplying the enemy (Allies or Axis, depending on the campaign) with advanced Powered Armor. Then you discover that they're giving those to your side as well. This makes their end-game clear. Cripple both sides, and you can pick up the pieces with technology that neutralizes the Powered Armor advantage.
The Kingdom of Loathing "Mysterious Island of Mystery" is inhabited by Frats and Hippies who the Council would like to see wipe each other out in time for the tourist season. Though the Obligatory Pirates remain out of sight during the war you incite, it's possible to get them to strike the finishing blow, bombing them all back to the stone age.
Deus Ex: Invisible War allows the player to do this between the WTO and The Order. Turns out to be subverted, because the Illuminati is actually running both sides. Later, the player can play this straight with the Illuminati, the Templars, and Apostle Corp.
On a more humoristic note, there is a whole subplot about the ruthless competition between the Pequods and Quee Quegs coffee chains. It is eventually revealed that both chains are secretely owned by the same company, which controls and organize the "coffee war" to make even more money.
Wrathion in World of Warcraft allies himself with both the Alliance and the Horde, telling players he supports their side in the conflict, regardless of which faction they belong to. He's not trying to Divide and Conquer them, instead he's worried that an outside enemy is coming, and the Alliance/Horde war has to end.
The "Clan War" questline in Borderlands 2 has the player doing this with the feuding Zaford and Hodunk families.
At the end of Assassin's Creed, Robert de Sable finds himself with the advantageous position of being able to convince both his Crusader brothers and the Holy Land defenders, the Saladin's Saracens, that they need to group together and deal with the Assassin brotherhood, as Alta´r has been assassinating key people in both. However this plan gets snuffed when Alta´r addresses King Richard directly at Arsuf and calls out de Sable's plan, to which Richard actually acknowledges Alta´r's claims and allows God to sort out whose position is correct by pitting de Sable against Alta´r in armed combat, to which Alta´r obviously wins.
Buck Godot: Buck does it in multiple arcs. A great one is at the end of the Psmith arc, where he starts off with playing two sides while both of them are standing right next to him. The Psmiths believe him, Der Rock the Destroyer doesn't. Which turns out to be a mistake, since he was being truthful to Der Rock. But that was exactly what Godot was counting on. It ends with him getting paid by Der Rock (since he had done the job he was supposed to) getting paid for the job the Psmiths were supposed to do (but failed to because of Godot trickery) and getting paid for aiding in the capture of Der Rock (without actually betraying him, he got himself captured by not believing Godot.)
In The Order of the Stick the IFCC grant Vaarsuvias massive arcane power because they know that having it will encourage the elf to attack Xykon, thus tying both Xykon and the Order up in a conflict while their pawns move in and snap up the MacGuffin.
Aladdin: One episode had Nefir the imp trick the Odifferans into believing that Aladdin had stolen a sacred artifact, so that they would attack Agrabah, and supplied both sides with weapons for an exorbitant fee. Once his intentions were revealed (as was the fact that Nefir himself stole the artifact), both sides threatened Nefir into rebuilding Agrabah and refunding both sides' money.
In the Looney Tunes short "The High and the Flighty", Daffy Duck is a novelties salesman who supplies for both Foghorn Leghorn and the barnyard dog in their ongoing prank war. He is found out when he accidentally sells them the same gag (the Pipe Full O'Fun Kit No. 7) and decide to team up against Daffy to trap him in his own device.
Bob's Burgers: In "Beefsquatch", Bob and Gene have their own cooking segment in a local talk show and try to sabotage each other. They both unknowingly enlist Louise to come up with ways of messing with each other, which she gladly does. Eventually Louise gets disgusted at Bob and Gene's competitiveness and quits.
An episode of Transformers showed that the Quintessions had been doing this to a pair of warring planets for hundreds of years. When the two sides found out about this they promptly cancelled the war.
War Profiteers in every war ever fought.
The Swiss during World War II. They did profitable business with both sides.
In a related example from the same time period, Ho Chi Minh took advantage of aid and equipment from both the People's Republic of China and the Soviet Union during the Vietnam War. He was able to get away with it because the PRC and USSR had been at each other's throat for some time by the mid 1960s, but the US and NATO had not yet discovered the 'Sino-Soviet split', and both countries wanted to project an image of unified world communism to the West. Being the master manipulator that he was, it is likely that Ho knew this and the whole scheme was a deliberate Batman Gambit.
A few wars in Ancient Greece (e.g. The Corinthians during the Peloponnesian War) began with a such a plot. Typically, side A would deviously provoke a proxy of side B to invade one of their own proxies. Side A thus gained a pretext to invade the proxy of side B, prompting side B to declare all-out war on side A. The advantage was that, in the heavily morally charged political climate of Classical Greece, side B would appear to have been the aggressor.
Zeno, Emperor of Byzantium, pulled off one of these in A.D. 488 when he induced Theodoric the Great, King of the Ostrogoths, to invade Italy, which was then held by King Odoacer. Both men were nominally servants of the Emperor but actually independent rulers who were constantly causing trouble; by getting them to go to war with each other, Zeno ensured that the Empire would be rid of at least one set of troublemakers, no matter which side won.
Could be considered an instance of Divide and Conquer, except that the Emperor didn't follow up his successful gambit (Theodoric won) with a conquest of the Ostrogoths. Although, a few decades later, Justinian did manage to conquer the Ostrogoths and much more.