The kingdom of Hironeiden a fine and dandy place to live. Open spaces, nice forests, friendly neighbors to the north and no civil unrest to speak of. Until, that is, a group of soldiers on patrol near the borders discover a hamlet burned to the ground. They chase after the culprits and discover a group of orcs on the run.

From there on it's full out war as the orcs and ogres of Hexter move to invade with their new warlord Regnier at the head of their army while the humans mount their counter offensive. It does not go well, as the various forces of Bersia, all with their own goals and intentions, get involved in a huge war that may very well shape the fate of the entire world.

Kingdom Under Fire: The Crusaders is an action/strategy game for the XBOX. It was created by Phantagram, the same studio that would go on to make Ninty-Nine Nights. It received a sequel (which is also partially a prequel) named ''Kingdom under Fire: Heroes'', which tells the sidestories of seven other characters that already appeared in the previous game.

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!! VideoGame/KingdomUnderFireTheCrusaders contains examples of:
* AndNowForSomeoneCompletelyDifferent: The game has four playable hero characters. The changes in move set and playstyle can be quite jarring.
* ArmorIsUseless: Human soldiers wear metal armor and die just as quickly as anyone else
* AnachronicOrder: The different chapters, especially if we include ''Heroes'' as well. For instance, Ellen's, Leinhart's, Urrukubar's campaign take place five years before the battles in the main game, but those of Morene, Cirith, Walter and Rupert do not.
* AntiVillain: The sequel, ''Heroes'', provides a surprisingly large amount of this thanks to the SympatheticPOV. Despite being classified as the Dark Legion, the protagonists do not really engage in any particularly heinous acts except for the necessary evils of war and showing the occasional callous attitude. In fact, let's have a look at the four of them:
** Cirith is just a regular soldier trying to survive. While she betrays her commander, she only does so after said commander tried to get her killed several times. For the most part, her storyline consists of trying not to get killed and saving her comrades and family from danger.
** Urukubarr is not only not a villain, but arguably one of the most heroic and sympathetic of all characters. He is depicted as honorable and wise and only fights to liberate his country from foreign oppression. In fact, by the final mission of his campaign, one might find themselves joining in on his cries of "Liberate Hexter!".
** Morene is easily the most evil of the playable four. That said, she mellows a bit near the end due to the BreakTheHaughty situation she finds herself facing, as well as seeming fairly shocked when she has to face Leinhart. In her epilogue, she also reveals a hidden idealist side, having firmly believed in the pride and strength of a united Vellond Empire. There is also her growing friendship with the darkelf commander Ilfa, who she initially despises and distrusts, but grows to respect as she realizes she is an honest one.
** Finally, Leinhart starts out as a casanova and spoiled vampire princeling with little respect for anyone, but the time he spends with the orcs of Hexter, as well as the subsequent HumiliationConga he goes through before meeting Regnier, actually give him a heavy amount of CharacterDevelopment, turning him into a fierce and devoted knight who has learned to rise beyond his position of birth and stand up for something he believes in even if it may mean giving up all his priviledges.
* AnnoyingArrows: Archers are definitely useful support units to have but nothing stops the hero characters from continuing to run around slaughtering dozens of enemies after being pin cushoned.
* AttackAnimal: Hexter makes heavy use of them, with their giant scorpions and swamp mammoths.
* BeastOfBattle: Hexter, the orc and ogre nation, uses giant scorpions as siege weapons. They also employee swamp mammoths, which are able to shoot large masses of spores out of their flanks, acting as artillery.
* BodyHorror: [[spoiler: The late game enemies are twisted fusions of human, orc, ogre, elf, and any other living species present at the awakening of Encablossa.]]
* BolivianArmyEnding: The ending to Cirith's campaign is...bitter.
* BoringButPractical: Of the wide diversity of units the game offers, you will likely end up sticking to very basic units like archers and infantry mostly, with a lot of healing magic. Aerial units are easy to loose and many other units like sappers or fire elementals suffer from CripplingOverspecialization or are just not that powerful.
* ChekhovsGun: The Dragon Tomb and the Battle Balloon introduced early on in Lucretia's and Gerald's campaign become relevant in the endgame.
* CripplingOverspecialization: Advanced units sometimes end up lacking in basic areas. Sappers shouldn't get into a melee fight. Neither should cavalry either (unless it's heavy orc axe cavalry).
* CuttingTheGordianKnot: Several missions have moments where you're supposed to partipate in a complex strategic scenario, outmaneuvre an enemy, or pull a tactical retreat. If you are strong enough (that is to say, good in melee and with plenty of healing nearby), you can usually just breeze through anyway. Especially jarring considering that the lategame expects that kind of combat prowess from you all the time.
* DarkIsEvil: Played straight [[spoiler: once you learn about Encablossa and Nibel, the gods of dark and light respectively.]]
* DialogDuringGameplay: Most missions have extensive inter-character dialog, normally between the hero (play character) and the two lieutenants fighting with them and sometimes conversation with allied units.
* DropTheHammer: Rubert and Kendall use hammers in combat. Rubert's is greatly oversizes while Kendall's is functionally closer to a polearm.
* EasyLogistics: Played straight during combat, your units are comprised of dozens of soldiers, none of whom seem to be carrying any supplies. When you return to camp between missions you can find your troops at their barracks where they, presumably, get plenty to eat and drink.
* ElementalPowers: Magic spells and lieutenant abilities can be elemental in nature. Lightning and fire are the most common you'll run into.
* EldritchAbomination: [[spoiler: Encablossa]].
* ElvesVersusDwarves: Averted. Both are races driven to the brink of extinction, elves existing only as Protectorates under Hironeiden now, dwarves being scattered to the mountains north of Ecclesia, making it easy for them to bond over their shared situation, especially when the dwarf elder takes in elven refugees. It is said that they did not get along well in the past, but the dwarves and elves we see in Rupert's campaign are good friends.
* EnemyMine: The characters team up against a shared enemy for the final missions.
* ExpositionBreak: Aside from updating your units this is what world map screen is for, especially in the late game when you would have no idea what's going on without [[spoiler:Regnier]] filling you in on events that happened before most of the characters where born.
* FantasticRacism: Something of a theme. All the races of Bersia have grown to passionately hate each other during previous wars (with the exception of elves and dwarves, curiously enough, who get along very well). This is the reason the all-out catastrophical world war depicted in the game breaks out easily, despite being instigated by an outside force. The nations do not investigate their situations properly, instead believing they are just dealing with TheUsualAdversaries, and jumping straight into all-out aggression.
* GreyAndGreyMorality: The game basically starts you off with your average WhiteAndBlackMorality StandardFantasySetting, then completely turns the concept on its head. To give a few specific examples:
** It's the "good guys" who start the war. [[spoiler: Even though they've been deceived, it was still humans who instigated the raid on Greyhampton and it was the complete distrust of humans in the words of their dark elven neighbors that kept the war growing more intense]].
** Regnier, who just screams ObviouslyEvil EvilOverlord, is trying to keep the world from falling to TheEndOfTheWorldAsWeKnowIt and [[spoiler: proves instrumental in preventing the worst when it does happen]].
** Similarly, the plans of most of the "bad guys", while ambitious, would keep the world in a comfortable status quo instead of destroying it. Several of them have reasonably sympathetic motives.
** Kendal, who is one of the more heroic characters, is working for the Ecclesians, one of the most vile factions. Walter, who pulls a DefectorFromDecadence on Ecclesia, commits the most atrocities of any of the heroes and ends up [[spoiler: unleashing the SealedEvilInACan]].
* GodAndSatanAreBothJerks: The world, as it exists at the beginning of the game, is under the control of [[spoiler:Nibel, the god of light]], but the nations are still divided and its far from peaceful, especially in places like Vellon and Hexter. And when [[spoiler:the age changes to the Age of Darkness under Encablosa]] it just gets worse. The [[spoiler:Age of Light]] is certainly better than the alternative, of course.
* GodOfEvil: [[spoiler:Encablossa, as the god of darkness, torments the beings of light whenever the age of the world swings from light into darkness.]]
* HeroesPreferSwords: Played straight with Gerald, Lucretia, and Regnier all use swords. Averted by Kendal, fights using both a hand mace and a staff long warhammer.
* HeroOfAnotherStory: All of the playable characters are this to each other, really. Rupert is the most obvious example, as his journey to gain the support of the elves and dwarves is alluded to in Gerald's campaign, but becomes playable in ''Heroes''.
* HideYourChildren: Played straight with the justification that all of the events where characters are visible on screen take place on battle fields. Possibly averted with Thomas, one of Kendall's lieutenants, the youngest character in the game. He fights on the field along with Kendall and can get the crap kicked out of him (though he usually doesn't, being quite skilled as a fighter and a magician).
* TheHorde: Basically how the human kingdoms see the orc and ogre tribes, especially after they are united by Regnier into a single organization (the commonwealth of Hexter).
* IHateYouVampireDad: Taken literally. Leinhart doesn't seem to greatly care for his vampiric father, the King of Vellond.
* InTheHood[=/=]MalevolentMaskedMen: Regnier has a large brown hood and short cape. However, the hood casts only a partial shadow. The rest is completely covered by layered metal which completely conceals his face, no even leaving eyes holes or any normal facial features to look at. It's impossible to be sure with the hood but it appears that the "mask" is actually the faceplate of a helmet from which Regnier's massive horns extend.
* ImmortalityInducer: [[spoiler:The Ancient Heart, at least for Regnier.]]
* KnightInShiningArmor: Gerald. He seems to think of himself as more of a soldier than a 'knight' but he fits the trope.
* KnightKnaveAndSquire: Kendall, Duane, and Thomas, in that order.
* LevelMapDisplay: Type 1. Each combat has a map of the available area, used when directing units.
* LivingForeverIsAwesome: [[spoiler:It is according to Regnier. He seems to have actively sought it out previously and regrets it's loss after the Ancient Heart is destroyed.]]
* MadeOfIron: Regnier. He traipses around the desert in what amounts to a metal loincloth and a cape and shrugs off whatever comes his way, [[spoiler:including Rupert's suicidal final attack]] with no apparent ill effects apart from annoyance.
** Let's not forget the time he's caught in Gerald's trap, where an entire forest is set ablaze with Regnier's forces trapped inside. The troops celebrate, believing they've finally taken down Regnier... until they see Regnier calmly walking toward them through the flames as if nothing happened.
* MedievalEuropeanFantasy
* NamesToRunAwayFromReallyFast: Regnier, for his in-game world reputation alone. Furthermore, [[spoiler:Regnier isn't his real name. Originally Regnier was 'Rick Blood', which probably qualifies as another example]].
* NoCampaignForTheWicked: Averted, you spend a fair amount of time playing as Lucretia, the dark elf, leading the forces of Vellond, who certainly the bad guys [[spoiler:until the god of darkness starts destroying the world]].
* RoyalsWhoActuallyDoSomething: Leinhart is the Prince of Vellond but he's out in the field kicking ass with Regnier, if you really consider that a constructive use of a noble's time.
* ObligatoryWarCrimeScene: While this ain't exactly ''Literature/ASongOfIceAndFire'', frequent mentions are made to all sides executing enemy prisoners and using EnhancedInterrogationTechniques to fish for information. This appears to just be how war is waged in this world, which makes some sense considering the serious racial tensions between the different peoples.
* ObviouslyEvil: Regnier. He's tall, dark, has horns, wears spiky armor; Essentially the guy looks like Dr. Doom co-playing as Skeletor.
* OneManArmy: All of the playable characters.
* OurElvesAreDifferent: Regular elves are your average fantasy elves, but have very little relevance to the story. Darkelves are one of the main factions, though. They are a nationalist race organized into feuding city-states, they heal while in forests, they shoot three times as a fast as a human and they refer to themselves as High Elves.
* OurOgresAreHungrier: Played straight. Ogres are noticeably larger than other units on scene and speak in broken fragments.
* OurOrcsAreDifferent: They are shorter and squatter than humans and ruled by ogres. There are no named orc characters in the game but we hear their units deliver some rather dim lines.
** "I got axe for jou!"
** "Orc riders... ride!"
* OurVampiresAreDifferent: Vellond is ruled by vampires and half-vampires are used as their representatives in dealings with other Vellond races such as the dark elves and the orcs.
* OutOfTheInferno: Regnier gets to do this.
* PaddedSumoGameplay: Towards the endgame you may begin to experience this as the enemies become tougher and tougher.
* PlayingWithFire: Regnier is capable of igniting himself and his sword as a special attack. The fire spreads to whatever he attacks for a short time afterwards.
* PointOfNoReturn: It's pretty clear when it's coming, luckily. This is partly because [[spoiler: it appears to be the end of the current quest, when you are trying to prevent Walter from destroying the Ancient Heart]] so you probably aren't expecting to do a lot of backtracking after that point anyway.
* PunchedAcrossTheRoom: Regnier's combos can end with him delivering a straight punch that will stagger or throw back anyone on the receiving end.
* RidiculouslyFastConstruction: Played straight, differently from other examples. Because the game isn't an RTS the construction doesn't appear on screen but there's nothing stopping you from switching a unit from infantry to cavalry or siege weaponry between missions, even if you're in the desert miles from the nearest city.
* RPGElements: You are able to select equipment for your leader and two secondary characters as well as the units as a while.
* RunDontWalk: For a squad focused military game there isn't much marching for the foot troops. You can order them to go slower and keep quiet but by default it's nearly a sprint.
* SaveTheWorldClimax: Eventually becomes the main quest of the game though [[spoiler: it begins metaphorically (saving the human kingdoms) when the head of the church gives you a mission and gets literal after that mission is completed and the god of darkness starts destroying everything]].
* SensibleHeroesSkimpyVillains: Played straight. All of the heroic characters wear complete clothing and full body armor. The villainous characters are all {{Stripperiffic}} including full dressed Leinhart, who models what appears to be skin tight leather evening wear.
** Justified in that the villains are half-vampires and darkelves, who are superhumanly agile and fast, but lack the constitution and strength of humans, dwarves or orcs. When Lucretia's group first encounters heavy human infantry, they are confused why anyone would slow themselves down that much with metal armor, especially when it just makes you vulnerable to lightning magic (which is a very common sight on Bersia's battlefields).
* SiegeEngines: Human units can employ seige weaponry such as catapults and ballistas.
* SlidingScaleOfIdealismVersusCynicism: On the cynical side with a few idealist characters. The game largely feels more cynical with several characters clearly motivated entirely by their own desires. Good people exist, Gerald standing as a prime example, but these people are often forced or ordered to do unpleasantly pragmatic things. Even Gerald, at the end of the first mission, coldly orders his soldiers to take one of the dark elves for interrogation (read, torture) and "kill the rest". [[spoiler:There is a god of light, Nibel, who seems to also be the good god of the world. But it's eventually revealed that Nibel had to basically cheat Encablossa to get the current arrangement of the world, which is then put back on the track to darkness due to human action]].
* SlidingScaleOfSillinessVersusSeriousness: Heavily on the serious end of the scale. Battles are loud and bodies stay on the ground for sometime after mooks die. The plot also takes itself seriously, even approaching [[spoiler:CosmicHorrorStory]] in the end game.
* SpecialAttack: Each commander has two lieutenants who not only have their fighting abilities but can be called on to assist with a signature attack during a fight.
* StoryToGameplayRatio: The game falls in the high middle range. While the game has an extensive story, it is often told while playing the game itself in the form of character dialog. However this is intercut with world map "cut scenes" of debate between characters and information exchange which can be quite lengthy and numerous.
* {{Stripperiffic}}: Any female from Vellond, apparently. Basically every female character and model in the game apart from one. And Regnier as a male example.
* SealedEvilInACan: Do not break [[spoiler:the Ancient Heart!]]
* TrapMaster: The player can become one whenever they have access to a unit of Sappers.
* UncleanlinessIsNextToUngodliness: Played straight for Hexter. It's not directly mentioned but the ogres and orcs don't look like they smell too great. The same probably holds true for Regnier since he lives with them. Averted for Vellond, where the dark elves and half-vampires seem to find the time to wash up.
* UselessUsefulStealth: There are a few sneaking missions in the game, most of which can be easily defeated by taking the enemy upfront instead and supporting with lots of healing. This also gives more XP.
* TheUsualAdversaries: Played straight with humans and elves fighting orcs, ogres, and dark elves. [[spoiler:Averted once Encablossa appears and starts making freakish mutated enemies]].
* WarIsHell: Perhaps one of the most subtle examples ever. It's become a clichee by now to point out that the [[WhatMeasureIsAMook regular soldiers you are killing]] might have family and loved ones too. However, due to the point-of-view mechanics, you actually experience it in this game, seeing the story from both sides and realizing that you're ''killing the friends of your previous characters''.
* WhatHappenedToTheMouse: In-universe example: Regnier's epilogue states that to this day, it is unknown how Ecclesia learned of the Ancient Heart. However, Walter's campaign in ''Heroes'' explains this one, Walter was whispered to by Encablossa posing as God, who told him of it and ordered him to find it, causing the Ecclesians to make a secret alliance with the Kaedes in order to obtain the Heart.