History Main / WarArc

** The Hawk of the Millennium Empire arc focuses on one between Midland (and the Apostle army led by the reincarnated Griffith) and the Empire of Kushan led by the rogue Apostle Emperor Ganishka.

** The Whitebeard War saga, especially the Marineford arc, is the third and most famous war arc due to the sheer scale, as powerful characters throughout the series all converge for a BigBadassBattleSequence with serious implications on both the characters themselves and the world at large; everyone expects this to signal the EndOfAnEra regardless of who wins. This all started when Ace, brother to [[IdiotHero Luffy]], lost his fight to [[BigBad Blackbeard]] and was sent to the Marines for execution. [[WorldsStrongestMan Whitebeard]], Ace's captain, mobilizes his entire fleet at the Navy's HQ, Marineford, to try to rescue a man he considers a son. The Marines mobilize not only hundreds of thousands of their forces, but all three Admirals, dozens of Vice Admirals, and the Shichibukai, privateers who work with the World Government, to stop Whitebeard, with Fleet Admiral Sengoku himself leading the defense of Marineford. Due to the circumstances surrounding Ace, Marineford also doubles as a RescueArc, as the whole point was to save Ace from execution. It's also unusual among both war and rescue arcs for a couple of big reasons: almost none of the main cast are present (the protagonist is there, but none of his TrueCompanions), the hero is actually one of the weaker people on the battlefield, and [[spoiler:the antagonists win the war, albeit at a price. The rescue also fails, with the character they're trying to rescue getting killed.]]

** ''VideoGame/MassEffect3'' features the intergalactic war against the Reapers and their Husks, the conflict with a massively strengthened Cerberus, and the quarians retaking their homeworld from the geth, all going on ''at the same time''. The developers have repeatedly said that ''Mass Effect 3'' is the start of World War II IN SPACE!...

* The ComicBook/GreenLantern has the ''ComicBook/SinestroCorpsWar'' (Green Lantern Corps vs Sinestro Corps), War Of Light (7 different Corps against each other) and ComicBook/BlackestNight (everybody against Black Lantern Corps).
* ComicBook/ChaosWar is this for ComicBook/TheIncredibleHercules.
* Cosmic Marvel has had multiple war arcs in last few years. ''ComicBook/{{Annihilation}}'' was a war between the Negative Zone and the normal universe, ''ComicBook/{{Annihilation}}: Conquest'' told the tale of the Phalanx's invasion of the Kree Empire, ''ComicBook/WarOfKings'' depicted the war between the Kree and Shi'Ar empires and ''ComicBook/TheThanosImperative'' was a war between the normal Universe and [[EldritchAbomination the Cancerverse]].
* ''ComicBook/{{Civil War|2006}}'' focuses on heroes taking different sides and fighting about whether or not to put themselves under government control and do away with secret identities.
** 11 years later, it got a sequel, ''ComicBook/CivilWarII'' this time with the focus on a Inhuman being discovered who can see into the future and it being argued by the heroes if they should use his powers to stop disasters before they happen or leave it be before they end up [[SelfFulfillingProphecy causing the disasters themselves]].
* ''ComicBook/{{Secret Wars|1984}}'' in which a being named the Beyonder pits good and evil in an experiment to see who would win. It got a sequel sometime later, a somewhat sequel in "Beyond" a few years down the line with a similar premise and [[ComicBook/SecretWars2015 a remake in 2015]] which had the remnants of the destroyed main and Ultimate Marvel universes fused together into one planet ruled over by Doctor Doom.

* ''ComicBook/AmazonsAttack'', which features the Amazons of Themyscira, led by Franchise/WonderWoman's mother, Queen Hippolyta, launching an invasion on Washington, D.C., with various superheroes, including the Franchise/JusticeLeagueOfAmerica, attempting to quell the conflict.

* ''Manga/SoulHunter'' has the Great Sennin War, a conflict between the Sennin from Kongrong Mountain and the ones from Kingou Island.

* ''ComicBook/CivilWar'', which focuses on heroes taking different sides and fighting about whether or not to put themselves under government control and do away with secret identities.

*** The first half of Season 8 sees the protagonists in conflict with the PADRE organization to try and end their ReignOfTerror.

* The Arachnophobia arc, a war between DWMA and Arachnophobia which has highlights such as a battle in Lost Island for a Demon Tool BREW, anf culminates with a full-scale assault on Baba Yaga's Castle, Arachnophobia HQ; and the Moon arc, pitting DWMA and [[spoiler:legions of Clowns defending the Kishin Asura]] in ''Manga/SoulEater''. In both cases, Medusa and her gang take part to reap some benefits or [[spoiler:being an important factor for the heroes to suceeed.]]

* ''LightNovel/ACertainMagicalIndex'' has the British Civil War arc, and shortly thereafter, the ''WorldWarThree'' arc, the latter of which makes for the climax of the original series of light novels.

** ''Series/TheWalkingDead'':

* The first ''Animation/PleasantGoatAndBigBigWolf'' movie, ''The Super Adventure'', is about the goats shrinking to investigate what's made Mr. Slowy's snail friend sick. The cause of his illness is a war raging between two factions of bacteria that the goats assist in stopping.

* ''Literature/MagicalGirlRaisingProject'' has a war arc that's split into two parts:
** '''ACES'' has the [[BigBad Puk Faction]] vs the [[NominalHero Osk Faction]] vs [[FaceHeelTurn Princess Deluge]]'s Team [[MeleeATrois vs]] [[spoiler:a [[BrainwashedAndCrazy brainwashed Ripple]]]].
** ''QUEENS'' is the [[BrainwashingForTheGreaterGood Puk Faction]] vs the Osk Faction, [[EleventhHourRanger Caspar Faction]] and [[EnemyMine Princess Deluge's Team]].

* ''LightNovel/MagicalGirlRaisingProject'' have 2 War Arcs, one after the other, but it is justified because both are the same war, just in different stages:
** The ACES arc have the [[BigBad Puk Faction]] vs the [[NominalHero Osk Faction]] vs [[FaceHeelTurn Princess Deluge]]'s Team [[MeleeATrois vs]] [[spoiler: [[BrainwashedAndCrazy Ripple]]]].
** The QUEENS arc changes this to [[BrainwashingForTheGreaterGood Puk Faction]] vs Osk Faction, [[EleventhHourRanger Caspar Faction]] & [[EnemyMine Princess Deluge's Team]].

* ''{{Manga/Vagabond}}'', as a manga based on the lives and deeds of historical Japanese martial artists, is bound to have war arcs.

* ''[[Anime/YuGiOhARCV Yu-Gi-Oh! ARC-V]]'''s main story is about an interdimensional war between four dimensions. While the main characters are only a small team of Lancers, they face off against the Fusion-based [[AcademyOfEvil Academia]] and their army. Each arc focuses on the specific factions and their takes on the war.

** Season 3 of ''Series/StarTrekEnterprise'' has the titula ship racing to stop the Xindi from launching an attack on Earth.

** Season 3 of ''Series/StarTrekEnterprise'' has the eponymous Enterprise racing to stop the Xindi from launching an attack on Earth.

* ''Manga/SoulHunter'' has the Great Sennin War, a conflict between the sennin from Kongrong Mountain and the ones from Kingou Island.

** The ''Series/StarTrekVoyager'' writers wanted to make "Year of Hell" a season-long arc, but the executives said no, and it was instead made into a two-parter.