Battle of the Iron Labyrinth
The Battle of the Iron Labyrinth was a battle between the Imperium and Black Legion in 777.M41. Beginning after a Black Legion fleet cut a path into the worlds of the Cadian Gate, the defenders of Cadia managed to slow the attack before pushing it back with the combined effort of Imperial Guard reinforcements and Imperial Fists Space Marines. Eventually the renegade forces are finally broken, retreating back into the Eye of Terror.
- 1: Black Legion - A Codex: Chaos Space Marines Supplement (E-Book), A Legacy of Vengeance.