Changes

[[Perturabo]] soon devised and enacted the one real victory for the Iron Warriors in the immediate aftermath of the [[Horus Heresy]]. He crafted a trap on [[Sebastus IV]], designed to ensnare [[Rogal Dorn]] and the [[Imperial Fists]], with whom Perturabo and his warriors harboured a bitter rivalry. This trap was known as the [[The Iron Cage|Eternal Fortress]], a keep centered centred within twenty square miles of bunkers, towers, minefields, trenches, tank traps and redoubts. Upon hearing of this, Rogal Dorn publicly declared that he "would dig Perturabo out of his hole and bring him back to [[Terra]] in an iron cage". As a result of this statement, the ensuing battle has become known as the [[Iron cage|Iron Cage]] or "Iron Cage Incident".{{Fn|1d}}

[[Rogal Dorn]] expected an honourable battle, but this was not to be. Beginning by isolating the four Companies of the [[Imperial Fists]] that landed from their orbital support, [[Perturabo]] began to carefully divide his enemy and destroy them piecemeal. Some Imperial Fists managed to penetrate the defences and reach the center centre of the [[The Iron Cage|Eternal Fortress]], only to find there was no central keep - simply an open space watched by yet more defenses. The fortress was a decoy of no real value. By the sixth day of the siege, Imperial Fists [[Space Marines]] were fighting individually, without support, using the bodies of their own battle brothers for cover.{{Fn|1d}}

The siege of the Eternal Fortress lasted for a further three weeks. Relief came only in the form of [[Roboute Guilliman]] and a force of [[Ultramarines]]. The sacrifice of over four hundred loyalist Marines' [[gene-seed]] paved the way for [[Perturabo]]'s ascension to [[Daemon Prince]]. Following this, the Iron Warriors retreated into the [[Eye of Terror]] and Perturabo crowned the world of [[Medrengard]] as the new home of the Legion.{{Fn|1e}} Since then, Perturabo has remained on Medrengard while his Legion both continues the [[Long War]] while warbands periodically battle one another.{{Fn|1d}} Their grudge against the Sons of Dorn has, however, endured the long millennia, and even now, the Iron Warriors take great pleasure in tearing down the defences of the Imperial Fists.{{Fn|74b}}