Perturabo grew up upon the world of Olympia, a mountainous planet divided into constantly warring city-states. When the Horus Heresy came, it was perhaps inevitable that the two Primarchs should find themselves on opposite sides of the galactic civil war. Yet, Perturabo felt himself side-lined by his brother Primarch, whose every proud boast was, to the master of the Iron Warriors, a barbed insult. The Iron Warriors were the Emperor's finest siege troops and their Primarch, Perturabo, was the equal of Rogal Dorn in the arts of fortification and strategy. When struck with a mutational 'gift' from the Ruinous Powers, most Iron Warriors simply cut off the mutated appendage, if possible, and replace it with a mechanical one. Like the members of the Adeptus Mechanicus and the Loyalist Iron Hands Chapter, the Iron Warriors have a strong predilection for replacing parts of their body with cybernetic enhancements. It was this rivalry between the Legions, and between their primarchs Perturabo and the Imperial Fists' Rogal Dorn, that helped turn the Iron Warriors to Chaos. The Iron Warriors, who were originally the IV th Legion of Space Marines, specialised in the breaking of sieges and assaults on static fortifications, which made them great rivals of the Imperial Fists Legion, said to construct the greatest static defences in the Imperium. The Iron Warriors are one of the nine First Founding Traitor Legions of Chaos Space Marines that turned to the service of Chaos during the Horus Heresy and now fight to overthrow the Imperium of Man. Silver armour, Gold trim, and Black shoulder pauldrons, Black and Gold striped pattern common

The iron wars