From Warhammer 40k - Lexicanum
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Midian is an Imperial world.
During the 7th Black Crusade, the Blood Angels were saved from destruction after their defeat here to Black Legion forces when the Carcharadons arrived. 
In 407.M39, the thousand-year war to secure the planet was won. That night, under a red moon, every celebrating soldier was suddenly decapitated by an invisible blade.
- 1: Codex: Chaos Daemons - Daemonic Incursion Edition — Chaos Rising
- 2: Imperial Armour Volume Ten pg.119