War

“	And another, a red horse, went out; and to him who sat on it, it was granted to take peace from the earth, and that men would slay one another; and a great sword was given to him.	„
	~ Revelation 6:4

War is one of the four Harbingers, and the horseman of Chapter 3.

Behavior

Phase 1

War, while mounted on his horse, will either charge left or right and won't stop until he has crossed the screen three times.
He will also shoot an 8-directional shot.
He will occasionally ascend off-screen and summon five troll bombs.
Once his health is halfway down, War's horse will blow up, and War will do his crying "rest animation", starting phase 2.

Phase 2

War will charge the player at high speeds, pausing occasionally to catch his breath.

Black: Summons 2 Mega Troll Bombs when he ascends off screen, and summons a single Troll Bomb behind his path when he charges through the screen. Also shoots in 6 directions when he stops chasing the player in his second phase.

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War is one of the Four Horsemen of the Apocalypse mentioned in the Bible.
In many depictions of War, he is shown holding a sword vertically [1], corresponding with why fan art and the in-game Vs. splash screen shows War holding his hobby-horse vertically.
Although his appearance on the vs screen shows his horse as brown, it is red in-game.
In the original game, War's face was round.
It appears in the resting animation that War is crying about his horse being blown up. This could be evident by when he loses his mount and immediately does his rest animation before charging at Isaac. This could explain why War chases after Isaac afterwards.