In fiction (and in RealLife) during a great war there's a certain strategic loss that is very significant to the point of being demoralizing, shocking, and Iconic in universe. One faction might be fighting a intergalactic war with ScaryDogmaticAliens, But there's one place in the galaxy that has no chance in hell of falling at the hands of the enemy. Perhaps it's a planet that's fortified by surrounding KillSat, a squadron of [[StarWars Sun Crushers]] and an armada of [[EVEOnline Titan-class motherships]], guarded by battalions of {{Voltron}}s and other CombiningMecha, [[RoboTech [=SDF=] fleets and Valkyries]].

But in the end, said planet falls, sending a chilling wave down the spines of TheFederation. Sometimes it could be a turning point in the war, but not always. A faction can suffer these defeats and not necessarily be defeated. But it's still a crippling loss that'll at least slow them down significantly. Sometimes these defeats are due to [[FailedASpotCheck surprise attacks]]. Could end up as a PyrrhicVictory for the attackers. Sometimes it's described as a NoodleIncident in some stories. This is usually TheWorfEffect, but for battles/wars (or even sports) instead of individuals. Usually to show how high the stakes is.

Usually overlaps with HopelessWar, RememberTheAlamo, and LastStand.

For the victors it could overlap with PyrrhicVictory, and WasItReallyWorthIt.

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!!Examples

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[[folder: Anime and Manga ]]

* End of ''CodeGeass'' season one when the [[{{LaResistance}} Black Rebellion]] fails spectacularly in the throes of what almost looked like their Finest Hour. HistoryRepeats in season two when the Black Knights are AGAIN defeated, this time by Lelouch, amplified by the fact that it means he now [[{{TakeOverTheWorld}} rules the world]] with an iron fist. [[spoiler: Which is then followed up by him being publicly assassinated by Zero - actually Suzaku in Zero's costume - at his apparent moment of triumph, in order to cement the final step of his [[ThanatosGambit Zero Requiem]]: [[UtopiaJustifiesTheMeans making himself into an effigy of all the evils of the world and then dying, taking all the world's hatred with him.]]]]
* The [[AllThereInTheManual Backstory]] of the ''Franchise/LyricalNanoha'' multiverse describes the loss of the [[TheEmpire Belkan Empire's]] homeworld as this.

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[[folder: Film ]]

* The Rebel Alliance from ''{{Star Wars}}'' blowing up not only the first Death Star, but the second one as well.
* The destruction of [[spoiler: Vulcan]] in the 2009 ''Film/StarTrek''. Not only was a massive loss for the Federation, but a signal to the fans that this was not going back to the status quo.

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[[folder: Literature ]]

* The [[WorldWarZ Battle Of Yonkers]]. They threw everything but the kitchen sink at the enemy and still lost. Though that was actually a detriment in the end, as all their gear and defenses and tactics were based on fighting an enemy that obeyed no human nor life norms (no pain, no fear, no stopping...)
* The Fall of Coruscant to the Yuzzhan Vong in the ''NewJediOrder'' series. Under the incredulous eyes of many of the surviving characters, the lights of The City That Never Sleeps go out for the first time in several thousand years.
--> '''Han Solo:''' ''[[TheEndOfTheWorldAsWeKnowIt The end of the world.]] Who’d’ve thought we’d live to see it?''
* The Dropsite Massacre of Isstvan V from the ''HorusHeresy''. Four noble space marine legions had suddenly turned traitor and fortified themselves on said planet (after burning Isstvan III and purging their own ranks of traitors), an overwhelming seven legions were sent to crush the rebellion before it could spread. Instead, four of those legions turned traitor too, and all of them caught the remaining three loyalist legions in a crossfire that saw hundreds of thousands dead. It went FromBadToWorse from there...
* ''Literature/TheSilmarillion'': The Battle Of Unnumbered Tears. It begins as a noble effort of the Elves, Men, and Dwarves to finish [[{{Satan}} Morgoth]] once and for all. It's the first coalition of all the races together to fight Morgoth, and the greatest army seen so far in the world outside of the gods. It gets crushed so badly and so many people die that Morgoth literally makes a hill out of the corpses. The worst part is that they never had a chance. And things get so much worse from there.
* In the Literature/{{Honorverse}} these were the [[spoiler: Battle of Manticore]] for Haven and [[spoiler: Grendelsbane disaster during the opening stages of the Second Havenite War and later the Operation ''Oyster Bay'' (though Manticorans didn't knew its official name)]] for Manticore, though both nations recovered from these pretty damn quickly, and with the vengeance.

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[[folder: Live-Action TV ]]

* The Battle of Wolf 359 from ''Series/StarTrekTheNextGeneration''.
* ''Series/StarTrekDeepSpaceNine'' provides a few:
** The Dominion attacking and destroying New Bajor, and shortly after the Galaxy-class ''USS Odyssey''. The writers invoked this trope to emphasize the Dominion threat - A starship the same class as the ''Enterprise'' stood no chance against this foe.
** The loss of Betazed in the ''[[Series/StarTrekDeepSpaceNine Deep Space Nine]]'' series to the Dominion.
** The Breen attack on San Francisco. Not as damaging as some of the others on this list, but shocking in that they were able to stab at the heart of TheFederation.
* The Battle of Serenity Valley in ''{{Firefly}}'', which was apparently the battle that lost the war for the Independents and sent Malcolm Reynolds over the DespairEventHorizon.
* In ''Series/DoctorWho'', much of the Last Great Time War between the Time Lords and the Daleks has only been explained through dialogue by the Doctor himself. However, we do have a definite shocking defeat that was said on the show: the Fall of the Cruciform, which was so shocking that it made the Master himself flee to the end of the universe.
** There was another one. The Doctor himself mentions that he was at the Fall of Arcadia, and that he might be able to come to terms with it someday.
* In the finale of ''Series/PowerRangersTurbo'', the planet Eltar falls, stripping the Rangers of their powers, forcing them into space to try and rescue their old mentor Zordon.

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[[folder: [=MMORP Gs= ]]
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* In ''WorldOfWarcraft'' there are numerous examples of this, as well as a couple of subversions, but given the name of the game, that's hardly surprising. There is the WarOfTheAncients which led to the destruction of the Kaldorei kingdom and the world splitting apart. Then the Orcs almost complete annihilation of the Draenei on Draenor. After which, said orcs go on to invade the world of Azeroth and sack the human city of Stormwind. Later, they go on to enslave the Red Dragon Flight, with which, they almost reduce Quel'Thalas to burning ash. Later, Prince/Death Knight Arthas ends up killing every man, woman, and child in Stratholme. After that, he kills his father, several paladins, including another father figure, Uther, then sacks Quel'Thalas and Silvermoon City to use the Sunwell, which he then blows up. Oh yeah, at the end of that campaign, Archimonde comes around to completely demolish Dalaran. The Kaldorei lose their beloved demigod, Cenarius, in a battle with Grom Hellscream. Finally, the Kaldorei give up their immortality by blowing up the World Tree to kill Archimonde. Did I mention there were a lot of examples in this?
** HOWEVER the killing of Archimonde, the whatever happened to Sargeras and Azeroth's ability to merely RESIST the Burning Legion are all pretty big. And implied to be bigger than anyone knows. Given this entails two {{cosmic horror}} like beings killed in a setting every (sane) person knows to be a {{cosmic horror story}} its kinda big.
** ''Wrath of the Lich King'' introduced the battle of Wrathgate, where a united Horde and Alliance force was destroyed by treasonous members of the Forsaken. This set back the offensive aginast the Lich King by years and renewed the waning war between the two factions.
** ''Mists of Pandaria'' begins with Garrosh Hellscream destroying Theramore, home to the peace-seeking Jaina Proudmoore. The leader of the neutral Kirin Tor is killed and Jaina nearly destroys Orgrimmar in return. Following these events, Jaina assumes leadership of the Kirin Tor with a decidedly anti-Garrosh mindset.

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[[folder: Video Games ]]

* The Fall Of Reach in the ''{{Halo}}'' universe. Which is the equivalent of America's CENTCOM, Norfolk Naval Shipyard, Fort Bragg, and Norad being taken out all at once. And that's not counting the civilian casualties.
** The Covenant get one of their own by losing a whole armada of about ''five hundred'' ships thanks to BadAss Admiral Cole.
** 90% of the Fleet of Particular Justice was lost during the Fall of Reach. The remainder was annihilated during the destruction of Installation 04. The loss was so spectacular the Prophets [[TheScapegoat laid the blame on Fleetmaster Thel'Vadamee]] and [[KickedUpStairs declared him Arbiter]]. One of the few times BOTH sides in the conflict had a chain of shocking defeats... at the same battles.
** When Flood overrun the Covenant capital High Charity it signals a massive loss for the Loyalists and the gradual turning of the tides.
* ''VideoGame/DeusEx'': the (French!) terrorist group blows up the Statue of Liberty!
* ''MassEffect'' has Shanxi, a human colony that was blockaded and sieged by the Turians during the First Contact War until it was forced to surrender. The {{DLC}} Bring Down the Sky features a devastating ColonyDrop that heralds the return of the Batarians into galactic politics. [[spoiler:Averted thanks to Shepard, though.]]
* ''EveOnline'' has the [[http://wiki.eveonline.com/en/wiki/The_Battle_of_Vak-Atioth_(Chronicle) battle of Vak-Atioth]], a CurbStompBattle between the Jove and Amarr Empires, which sent the latter reeling into VestigialEmpire status. Later on, the Amarr reversed their fortune in the Battle of Mekhios, where they wiped out an entire Minmatar fleet and send the remnants of their forces packing.
* ''VideoGame/DragonAgeOrigins'' has the Battle of Ostagar, in which the PlayerCharacter participates. [[spoiler: Much of the Fereldan army, and all of the Grey Wardens but the PlayerCharacter and TheLancer Alistair, are killed after Teyrn Loghain's forces, TheCavalry, abandon the battlefield.]]

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[[folder: Western Animation ]]

* ''WesternAnimation/AvatarTheLastAirbender'' had Iroh's siege.
** Not the best example, since the siege failed but didn't even slow the Fire Nation's progress. More appropriate examples would be the conquest of Omashu and Azula's coup in Ba Sing Se during the second season: the latter was particularly significant as Ba Sing Se was the last free city in the Earth Kingdom.
** However, considering the effect it had on the line of succession in Fire Nation's monarchy, it was an important defeat nonetheless. The city of Ba Sing Se was sieged relentless off and on for a hundred years, but Iroh's siege is the only notable attempt to capture Ba Sing Se due to it being a turning point in the history of the Fire Nation, and as a result, the 100 Year War. Iroh's loss in favor gave Ozai an opportunity to make a claim on the throne, which was successful, and as a result of Ozai's leadership, the Fire Nation came dangerously close to winning once and for all. ShockingDefeatLegacy is not a killing blow or major surprise attack, but instead a defeat that no one saw coming and one that has major consequences. Nobody imagined Iroh's son would be killed, nor that as a result Iroh would retreat. If it were any other soldier, Iroh would probably have pressed the attack and won. Or, at least, that's what everyone was expecting to happen. He might still have lost, but that's irrelevant. It's the perception of defeat at the hour of victory or safety that defines this trope.
*** Iroh was a much better leader than CardCarryingVillain Ozai, and if he hadn't retired, he would've found a way to crack Ba Sing Se open anyway, either with his original siege or later (he later managed it with a much smaller army, and against an army of comet-empowered Firebenders no less). Demoralizing Iroh and pushing him away from the war and the conquering mindset was the all-important coup which led to the Fire Nation's eventual defeat. Moreover, a hypothetical [[TheEmperor Fire Lord Iroh]] would have encouraged massive numbers of LesCollaborateurs due to his [[CoolOldGuy competence, winning personality]] and [[HeroAntagonist kindness]], ensuring Fire Nation dominion over the Avatar world during his lifetime at least. Instead, Ozai succeeded Azulon, but he only really cared for himself and increasing his personal power, using and abusing even his favoured daugher and his country as a whole as tools to this end and running both ragged in the process; further, with his evil antics, he put all his enemies into a very motivating "do or die" situation, as well as adding his own son and brother, considerable powers in the world especially the latter, to their ranks. Any fight against Fire Lord Iroh would have been half-hearted at best, by comparison. TL, DR: It was this trope because it replaced Iroh's solid leadership with Ozai and his VillainBall, a major strategic defeat for the Fire Nation.
*** Assuming, of course, that Iroh had zero CharacterDevelopment between the loss of his son and the start of the series, and was always that CoolOldGuy.
** Another example was the Day of Black Sun. [[spoiler: The Water Tribes and Earth Kingdoms had united to hit the Fire Nation at exactly the time that firebenders would be unable to bend. Everything was planned out and executed perfectly, but due to some clever stalling tactics by Azula and Ozai, the Fire Nation held out and the good guys were forced to break and retreat, and the Fire Nation could prepare for Sozin's Comet unopposed.]]
* The loss of the Homeworlds for the Terrans in ''WesternAnimation/ExoSquad'', although the [[spoiler:utter destruction of Mars]] late in the second season was an even more devastating blow to the Neosapiens. Phaeton built most of his anti-Terran propaganda upon it afterwards.

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[[folder: Real Life ]]

* [[{{NapoleonBonaparte}} Waterloo]] - So famous it's practically a synonym for defeat.
** Although as with many battles, what gave Waterloo such a "knock-out blow" mystique was not the battle itself but the subsequent pursuit. Thus in 1815, unlike 1812/13 and 1813/14, Napoleon's army was not given time to regroup and replenish.
** Another example would be the Battle of the Berezina, which marked the end of NapoleonBonaparte's squalid retreat from Russia. It was so bad, "une Berezina" became a synonym for catastrophe in France for a while afterwards.
** Subverted with the Battle of Bailén - the Spanish destroyed three French divisions. Unfortunately, it was so shocking...that Napoleon turned up to sort the mess out in person, and promptly sent Spain into retreat.
*** Double subverted, because although Napoleon sent the Spanish into retreat, it was the first clear defeat of a major French army since he came to power, which (along with the defense of Saragossa) encouraged his enemies to continue their fight. Thus not only did the French army find itself stuck in a bloody war on the Iberian Peninsula for the next six years, but Austria started another war in the following year (1809), leading to the first defeat of an Army led by Napoleon in person at Aspern.
* The Battle of Trafalgar became this for the Combined Navies in the Napoleonic Wars - the French and Spanish lost almost seven times as men as the British, and the majority of their active ships-of-the-line. Not only would they never challenge the British at sea again, it gave the British the ability to strike at will at French and Spanish trade, contributing directly to the collapse of both empires by slowly throttling their treasuries. Indeed, when Napoleon was presented with an embroidery of an Eagle strangling a Lion, he said that it should be the other way round. During the battle itself, the explosion of the ''Achille'' was what signaled the end of the engagement and convinced the Franco-Spanish fleet to run.
** The Battle of Quiberon during the Seven Years War effectively bankrupted the French government by causing a credit crunch (because financiers realized that the British could strike French trade at will). They ''still'' hadn't paid the debts off by the time of the Revolution, nearly fifty years later.
* The surprise attack on Pearl Harbor might count as one of these for the U.S.
** Subverted, however, in that Pearl Harbor was for more catastrophic for Japan than the U.S. A tactical defeat for the U.S., but it added to what was already a hopeless war with China.
* The [[http://en.wikipedia.org/wiki/Battle_of_Midway Battle of Midway]] became this for the Japanese, as their loss in the battle effectively halted their expansion and put them fully on the defensive for the first time. US Naval Supremacy was only a matter of time, however; the Empire couldn't stay lucky forever in the face of the Allies' overwhelming economic superiority.
* In a sense, the Doolittle Raid counts as well. After Pearl, the Japanese appeared invincible, seizing island after island and colony after colony. By April 1942, they had all but swept the Allies from the Pacific. Then, sixteen B-25s were transported by carrier a few hundred miles from Japan and dropped light bombs on Japanese cities. Almost no infrastructure damage was inflicted, but it scared the crap out of the Japanese. This drove Admiral Yamamoto to fight much more aggressively, causing him to attack Midway in order to secure it and thus the Japanese defense perimeter would be complete. Then, at Midway, all four of Yamamoto's carriers were sunk...
* Another real life example would be the Battle of Hastings, as England would've ended up an entirely different country without it. Yet another real life example (and an often fictionalised one) would be the Battle of Chi Bi in the RomanceOfTheThreeKingdoms, as it's widely believed that if the aggressors hadn't been defeated, the Three Kingdoms period might have ended then and there, which would have had a drastic impact on China's history.
** Another example, although lesser known to Westerners, but with nearly as much impact on China's history is the Battle of Fei River. Had Jin lost, the Han Chinese could have lost control of China, however, Xie An (who was famous as a great administrator and had little military experience) decided he wasn't going to let Former Qin [[TookALevelInBadass run wild]] and [[CrowningMomentOfAwesome beat back a far more experienced army well over twice the size of his own]]. It was the single largest catalyst in the fall of Former Qin and just ten years later practically ceased to exist.
** Hastings is a perfectly [[JustifiedTrope justified]] example, in that the King of England got an arrow to the head and his troops [[TooDumbToLive kept falling for fake retreats]]. Since few people really cared who was king at the time, William the [[strike:Bastard]] Conqueror pretty much won by default.
* Britain's 1940 retreat from Dunkirk marked a turning point in WorldWarII, but is remembered in Britain more for the heroic rescue of stranded troops than as a defeat.
** The "Fall of France" fits the trope name better. Dunkirk is more of snatching victory from the jaws of defeat (although Churchill was quick to point out that you don't win wars with retreats and that while it was great to save the troops, the Fall of France was still a major defeat for the Allies).
*** Also, they had to leave most of their heavy arms and equipment behind, so it would take a while before they were in a condition to face the Wehrmacht in the field again.
* The failed Rzhev offensive and loss of Sevastopol of 1942 were probably this for the Soviet Union. They were later overshadowed by the great victories of Stalingrad and Kursk, but these failures, which stemmed largely from overconfidence after the successful Battle of Moscow and generally crappy Soviet logistics, costed enormously both in lives and materiel, and later weighed heavily over Soviet morals and military thinking even late in the war and after it.
* For the European colonial powers in general, and the UK in particular, the [[http://www.historylearningsite.co.uk/fall_of_singapore.htm Fall of Singapore]]. It had been boasted that Singapore was the best-defended city in the world, the armour-piercing shells of her heavy gun emplacements capable of punching through any ship the Japanese had to offer. However, Singapore was besieged from the landward side, and their anti-battleship defenses were wholly ineffective at targeting infantry. Percival had 100,000 troops on paper, but they were in no shape to continue fighting. Realising that their situation was hopeless, he surrendered. Only to find that the Japanese only numbered some 30,000 and their supply situation had been even worse.
** Churchill himself felt the fall of Singapore to the Japanese in 1942 was the greatest defeat in British history.
-->'''Winston Churchill''':''"I put the telephone down. I was thankful to be alone. In all the war I never received a more direct shock."''
* [[TheVietnamWar Vietnam]] was the greatest military quagmire in United States history.
** Within the war itself, the Tet Offensive can be considered this. The vietcong attacked many cities simultaneously, notably claiming the US Embassy in Saigon. This was a major hit to the vision of American strength and hit their morale deeply. In reality, the vietcong suffered heavier losses than the American troops, but in terms of perception, this drastically swayed the war in their favour.
* The [[http://en.wikipedia.org/wiki/Battle_of_Stalingrad Battle of Stalingrad]], for the German forces in the Soviet Union. So much so that this was the first time the Nazis publicly acknowledged that the war was beginning to go badly.
* The [[http://en.wikipedia.org/wiki/Second_Battle_of_El_Alamein Second Battle of El Alamein]], for the Axis forces in North Africa.
** Despite the loss and withdrawal from El Alamein, the campaign in North Africa continued for another six months. When Rommel ordered the retreat, Montgomery did not pursue and thus allowed the broken German formations to withdraw, fortifying themselves within Tunisia. The loss of Tunisia occurred only a few months after the loss at Stalingrad, with a quarter of a million troops taken prisoner. Soon after, the loss of Sicily was so great that the Italians overthrew Mussolini.
** Rommel probably thought he could regroup and attack again the following year after halting the British offensive. What made El Alamein ensure this would never happen was that not too long after, the Americans started landing in Morocco and Algeria.
** After failing to break through to Alexandria and beyond in the ''First'' battle of El Alamein, Rommel would have had to retreat after the American landing in Morocco and Algeria in any case. Some people therefore see the Second Battle of El Alamein as having been fought to a large extent to build up British morale and prestige in a last chance to win a major battle without the American army helping...
* The Battle of Gettysburg was a major turning point of the American Civil War.
** Although the war did continue for nearly two years after that. Many however actually see the Battle of Antietam as the real turning point of the war, because this was the last real chance the Confederacy had of not just temporarily carrying the war north (there was also a Southern offensive in the west at the time, while even if Gettysburg had been won by Lee, Vicksburg still would have fallen to Grant), but also to gain recognition from the major European powers.
* The Battle of the Alamo, which was a major defeat for the Republic of Texas.
** Subverted and completely reversed in that the Alamo actually [[{{DefensiveFeintTrap}} fulfilled its objectives.]] While a tactical defeat, it was a resounding strategic victory that not only severely bled out the Mexican Army and allowed the Texan Army to organize into a fighting force. Also provided substantial [[{{RememberTheAlamo}} morale boost.]]
** The men of the Alamo had actually been ordered by Sam Houston to leave--Bowie's men originally came to destroy the fort, but the defenders chose to stay. Perhaps a better example from that war is the Battle of San Jacinto, where the relatively ragtag and much smaller Texan army hid out in the swamplands near what is now Houston, and defeated Santa Anna's men in a completely unexpected attack.
* Gallipolli for Australia and New Zealand. It's viewed in much the vein as Dunkirk for the UK, only more so.
* The Battle of Lepanto and the second Siege of Vienna for the Ottoman Empire.
* [[http://en.wikipedia.org/wiki/Battle_of_the_Allia The Battle of the Allia]] for AncientRome. The Gaulish chieftain Brennus defeated the Roman army and sacked Rome itself. The Romans were determined never to allow this to happen again, and strengthened the city's defences, reorganised the army and, for generations afterwards, marked the anniversary of the defeat by [[DisproportionateRetribution sacrificing the city's guard dogs as punishment]] [[YouHaveFailedMe for their failure to alert the Romans to a night attack on the Capitoline Hill]]. The sacred geese that ''did'' alert the Romans were carried through the city on gilded cushions in the same ceremony.
** Same thing would happen 800 years later in year 410, when the Visigoths under Alaric I sacked Rome. The Roman Empire remained as an independent nation and would live to 476, but it was clear to everyone after the sack that Rome was at that point just a shadow of its former glory self, and the only reason why the Huns were not able to finish the job was because of Flavius Aetius (who historians calls "the last true Roman")' tactical genius and his [[EnemyMine alliance with the Visigoths]].
** Also for the Romans, the Battle of Teutoburg Forest on September 9, 9 AD. Three Roman legions were returning to camp when they were attacked by Arminius, a Germanic chieftain who had grown up in Rome. All three legions were wiped out, and eventually the Roman Empire withdrew from Germania. Emperor Augustus, when told of the disaster, reportedly banged his head against the wall, shouting "Varus! Give me back my legions!"
*** More recent research, e. g. the finding of the remains of a post 9 A. D. battlefield in the middle of Germania where the Romans conclusively defeated their Germanic foes, indicates that Rome continued to make successful incursions into Germania much longer than was hitherto believed and that the eventual withdrawal from there was not immediately preconditioned on the battle of the Teutoburg Forest.
** Another great Roman disaster was the Battle of Manzikert in 1071, when the Seljuk Turks routed the much larger Byzantine army and captured Emperor Romanos IV Diogenes. While modern scholars don't consider it a "turning point" anymore, the disaster at Manzikert led to the loss of most of Anatolia (some parts of which irrevocably) and plunging the Empire into a series of civil wars. Until the end of the Empire in 1453 Manzikert was widely known as "that day" and considered one of the most shameful days of the Roman Empire.
* Amazingly averted by the Roman Republic in the First and Second Punic Wars. In the first, the Romans lost two entire fleets in heavy storms, losing 280 ships and 100,000 men in 255 B.C. and a slightly smaller number in 253, yet they kept building new fleets and wrested naval supremacy from Carthage. In the Second Punic War, Hannibal and his army inflicted three terrible defeats on the Romans, but Rome continued to wage war until ultimate victory. When Hannibal sent the news of his greatest victory at Cannae (216 B.C.) to the Carthaginian senate, the senator Hanno asked: "Did the Romans ask for peace? Did one of the cities of Latium or one of Rome's colonies rise against the Romans?" When Hannibal's emissaries answered "no" to both questions, Hanno said: "Then the course of the war has not changed."
* During the [[RedOctober Russian Civil War]], Kolchak's defeat at Tobol was the turning point for the Whites to start losing. After that defeat, Kolchak's Eastern White army started a retreat that quickly escalated to panicked flight resulting in the fall of Omsk, the rebellion at Irkutsk and Admiral Kolchak's own demise. For Denikin's Southern White army, the failure of his Moscow offensive at the battle of Orel was such a defeat; after Tobol and Orel the Reds had a practically guaranteed win, and the rest of the war was basically cleanup of remnant Whites, Blacks and Greens.
* The sinking of the SMS ''Szent István'' during WorldWarI was this for the Austro-Hungarian Navy. Before that, the Austro-Hungarians had tried various times to break the Otranto Barrage. Then the ''Szent István'', the ''flagship'' of the fleet, was sunk by ''two Italian torpedo boats that just happened to be in the area'', and not only the attack the flagship was supposed to lead was canceled, but the Austro-Hungarian navy didn't dare to leave the ports anymore.
** Not that there was much time left for another attempt - the ''Szent István'' was sunk on 10 June 1918, less than five months before the land battle of Vittorio Veneto which forced Austria-Hungary to sue for peace.
* The Mongols do this a lot they conquered China, decimated Persia, ravaged Russia, and nearly conquered Europe. But they also get the receiving end of this like in Vietnam.
* The disasters that were the Battles of Mukden and Tsushima were largely responsible for the Tsarist government to fold the RussoJapaneseWar, despite the still enormous strategic advantage and intelligence reporting of the impending collapse of the Japanese economy. The sense of national shame still felt forty years later was one of the major reasons the Soviet Union agreed to join the war against Japan in the closing days of WWII, despite technically still being neutral[[note]]The details of the non-aggression pact between the Soviet Union and Empire of Japan said that it would lose power only a year after its denonsation or non-prolongation, which happened in the Spring of '45[[/note]].

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[[folder: Sports ]]

* The 04 Dream Team during the 04 Olympics, who were soundly beaten by... ''Puerto Rico''. The media never let them live it down. Until they started curb stomping international teams again.
* The New England Patriots are best remembered for their 18-1 season. They were undefeated heading into the Super Bowl, and they lost the game to the underdog New York Giants on a flukey catch.
* The Miami Heat, led by LeBron James, Dwyane Wade and Chris Bosh, ran roughshod through the Eastern Conference in the 2011 playoffs, defeating even the Boston Celtics and the Chicago Bulls in five games apiece. Entering the Finals against Dallas, the Heat led the series 2-1... before losing the next three games to the Mavericks. It especially stings when you consider [=LeBron=] saying that he'd win multiple championships with Wade and Bosh. The media, the fans ''and'' the internet never let the Heat live it down after that, and the loss was haunting enough that it sent [=LeBron=] past the DespairEventHorizon. (he lead the Heat to the title the following year [[TheAce winning basically every award in the process]], but the legacy remains because he left Cleveland solely to finally get a title, only to fail again with a better team)
** It didn't help that the Heat seemed on the cusp of seizing victory for the series in both Game 2 (which would have severely crippled Dallas' morale) and Game 4, only for Lebron to get a little presumptuous by celebrating with Wade next to the Dallas bench in Game 2, leading to the miracle comeback that was led by Dallas superstar Dirk Nowitzki. From there, the Finals were a hard-fought battle to the finish.
* Speaking of {{Cleveland}}, their teams have plenty of this, helped by the fact that most of their notable defeats can be summed up with a single phrase (The Shot, The Fumble, The Drive, Red Right 88, The Slip). Two were even off-field (The Move, where the Browns were moved overnight to Baltimore; and The Decision, where [=LeBron=] announced his departure).
* TheWorldCup has at least three finals, 1950 (Brazil loses at home; 5 titles later, it's still a sore point), 1954 (DarkHorseVictory of Germany over the heavily-favored Hungary) and 1974 (DarkHorseVictory of Germany over the heavily-favored Netherlands... though not as unexpected as the previous one).
* The Boston Red Sox emassed [[http://en.wikipedia.org/wiki/Curse_of_the_Bambino#.22Cursed.22_results quite some]] in their 86 year drought. The Chicago Cubs's [[http://www.billygoattavern.com/legend/curse/ one also deserves mention]].

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