Two groups have been locked in a ForeverWar for a long, long time. Then, a third party (like TheHero) comes along and wants something from both of them. But first he has to play the peacemaker and stop the senseless bloodshed for them to work together with each other and with him.

Success usually results in a very, very awkward but hopefully honest (just how awkward and honest will depend on whether OntologicalInertia factors in or not) [[PeaceConference handshake between the two leaders]] and a SugarWiki/MomentOfAwesome for TheHero.

Compare YoungLoveVersusOldHate, which can overlap with this (cf. ''Theatre/RomeoAndJuliet'') but not necessarily, and VelvetRevolution, when a conflict that started off violently immediately winds down peacefully.
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!!Examples:

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[[folder: Anime and Manga ]]

* The main character's goal in ''Manga/{{Naruto}}'' is finding a peaceful resolution to the ancient ideological conflict between two dominant ninja clans, Uchiha and Senju.
* In a ''Manga/OnePiece'' arc, the centuries-long war between the natives of Skypeia and the tribal Shandians finally reaches a peaceful resolution after God Eneru nearly destroys everything and is defeated by Luffy. Luffy wasn't actually ''trying'' to do this, though; it was just a consequence of his actions.
* The war between the Tribes of Light and Shadow in ''Words Worth'' broke out over the shattering of the eponymous magical tablet and is ultimately resolved by a child descending from both Tribes, who reassembles the tablet and interprets its inscriptions.

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[[folder: Comic Books ]]

* {{Asterix}} in the Corsica album. As the Corsican chief stated: "Defeating the Romans is nothing special, but making two foes reconcile definitely is!" (paraphrased)

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[[folder: Film ]]

* A large portion of ''[[Film/TheMatrix Matrix Revolutions]]'' revolves around Neo traveling to the Machine City to call for an end to the war between humans and machines, [[spoiler:in order to allow him to stop [[BigBad Agent]] [[AGodAmI Smith]] from destroying both races]].

[[/folder]]

[[folder: Literature ]]

* In ''TheIcemarkChronicles'', Thirrin successfully forms an alliance between the Icemark and the vampires, despite the fact that the Vampire King and Queen have been their enemies for over a thousand years.
* In Creator/TerryPratchett's ''Discworld/{{Thud}}'', it turns out that the thousand-year war between dwarves and trolls started with a huge misunderstanding. The dwarves said that trolls ambushed them at Koom Valley, the trolls say the dwarves ambushed them. In reality, there was just a natural disaster.

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[[folder: Live Action TV ]]

* ''Series/StarTrekTheOriginalSeries'' episode "A Taste of Armageddon." The planets Eminiar 7 and Vendikar have been at war for 500 years. However, for most of this time the conflict has been completely simulated on computers. When the computers tell the inhabitants of the planets that they've been "killed", they obediently file into [[DisintegratorRay disintegration chambers]] and are destroyed. Captain Kirk sabotages the computers running the conflict, which will force the two planets to fight their war for real if they want to continue it. He figures that the horror of possible planetary obliteration will cause the two populations to seek peace instead. He turns out to be right - the planets do start negotiating.

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[[folder: Video Game ]]

* In ''VideoGame/TheLongestJourney'', April ends the ancient war between the [[WingedHumanoid Alatien]] and the [[OurMermaidsAreDifferent Maerum]] by uncovering proof that [[spoiler:they are actually the same species worshiping the same god]].
* In ''VideoGame/MassEffect3'', Shepard has a chance to end the war between [[spoiler:the quarians and the geth]] peacefully, though there are many conditions that have to be met for this to succeed. Also, the Krogan/Salarian/Turian enmity can be mended to the point where the three races start cooperating--something deemed impossible for at least several centuries. The Turians and the Humans have the latest in species grudges, but the Turians are the most willing to help humanity out (though they have their own problems).
** And as the Extended Cut shows, [[spoiler:the Control and Synthesis endings both result in a lasting peace between the Reapers and the galactic life, though only in the latter is it completely voluntary (in Control, Shepard becomes the new Reaper overmind and basically forces them to obey organics)]].
* A major plot point in ''VideoGame/{{Wild ARMs 5}}'' is to reconcile the ancient conflict between the humans and the Veruni.

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[[folder: Western Animation ]]

* The episode "The Great Divide" of ''WesternAnimation/AvatarTheLastAirbender'' had Aang do it with two tribes of SlobsVersusSnobs.[[spoiler:..by saying that he had witnessed the birth of their conflict (since he ''is'' [[ReallySevenHundredYearsOld Really 112 Years Old]]), which had been twisted over the century and was in fact no more than a children's game. And once the now peaceful tribes are out of earshot, he confides to Katara and Sokka that he made the whole thing up.]]
* GoneHorriblyWrong for [[WesternAnimation/TheLegendOfKorra the first Avatar, Avatar Wan]] when he [[spoiler:separates Raava--the World-Spirit of Order--from Vaatu--the World-Spirit of Chaos--and thereby sets up the latter to plunge the world into a 10,000-year age of, you guessed it, chaos and darkness. To be fair, Vaatu abandoned his pride to take advantage of Wan's kindly nature and manipulate him whereas Raava was extremely condescending and dismissive of Wan, refusing to explain her motives for keeping Vaatu entrapped until ''after'' Wan had freed Vaatu.]]

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[[folder: Western Animation ]]

* Parodied in ''Webcomic/{{Wondermark}}'' -- [[http://wondermark.com/657/ page #657, "The Negotiator."]]

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