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From Warhammer 40k - Lexicanum
Cleaning up the mess left for me
===Great Crusade===
Perturabo established himself as efficient and highly capable, but also brutal, bitter, and envious.{{Fn|9}} It is widely acclaimed that Perturabo was envious of [[Rogal Dorn]]. He was annoyed by his constant reminders of the perfection of the defences on [[Terra]]. The other primarchs also kept Perturabo at a distance. This might have been because of his supreme command of technology, far in advance of anything the other primarchs could do. He is referred to as the 'comrade' who devised the best plan to avoid the defences of [[Overdogg Mashogg]], an [[Ork]] [[Warboss]] under attack by [[Leman Russ (primarch)|Leman Russ]], leader of the [[Space Wolves]], and [[Jaghatai Khan]], Khan of the [[White Scars]] .{{Cite Marker EndFn|9}}.
The Iron Warriors went on to create citadels throughout the regions they fought in. Small numbers of Iron Warriors were left behind at these outposts, but Perturabo resented being forced to split his army. As time went on they were stereotyped as being the best army for sieges and garrisons, but eventually the Iron Warriors were so worn out that they simply began to enjoy the killing they had to do after the trenches were dug. A particularly vicious campaign was against the [[Hrud]] in the [[Sak'trada Deeps Campaign|Sak'trada Deeps]], a region that Perturabo saw as strategically useless. Nonetheless, he dutifully oversaw the purging of the Hrud despite his legion's heavy casualties, as it was ordered by the [[War Council]]. At the climax of the campaign, as his fleet lay devastated by a Hrud temporal shockwave, Perturabo could only blame the Emperor's vanity for the damage done to his sons on this useless campaign.{{Fn|12b}} It might well have been [[Horus]] who kept the legion on this role, allowing him to more easily sway the mind of Perturabo towards Chaos{{Cite Marker End}}.
==Horus Heresy==
Shortly after the [[Sak'trada Deeps Campaign]] Perturabo learned that his homeworld, Olympia, was in rebellion. Dammekos was dead and in his absence the politicking and bickering of the city-states had resumed. Perturabo demanded the Olympians themselves enact decimation, killing one in every ten of their own or face extermination and enslavement. Many refused, and Perturabo purged Olympia city by city, overrunning the fortresses he had built and sparing no one. Iron Warriors that refused to take part in the genocide suffered the same fate.{{Fn|12c}} By the time the massacre was over, five million Olympians had been killed and the rest put into [[slavery]]. While storming [[Lochos]]' palace, Perturabo came across his old foster sister [[Calliphone]] and strangled her to death after a furious argument where she blamed the Primarch for what had befallen their world. As Olympia died, Perturabo looked on in cold silence. After the pyres were burning, the Iron Warriors realized what they had done. They were no more the saviours of the [[Imperium]] - they had been destroying the Hrud one moment and the next they were committing genocide on their own. Perturabo realized the Emperor could never forgive him for what he had done.{{Fn|12d}} Horus, on the other hand, commended Perturabo for his decisive action and the Lord of Iron swore an oath of loyalty to the [[Warmaster]]. After the [[Dropsite Massacre]], Horus would present Perturabo with a hammer named [[Forgebreaker]], the gift symbolic of a signing of a pact between them. {{Fn|7b}}
It was in that time that disturbing news of the [[Horus Heresy]] and new orders came from Terra. Leman Russ and the Space Wolves had attacked [[Magnus]] and his [[Thousand Sons]] on [[Prospero]]. [[Horus]] had turned renegade with his legion the [[Sons of Horus]] besides some other legions. The whole of the Imperium was on the brink of a civil-war. The new orders were to join with six other legions and then to face Horus and his forces on [[Isstvan V]]. The result of the following [[Drop Site Massacre|battle]] was that the Iron Warriors, Night Lords, Word Bearers and Alpha Legion all joined Horus and almost completely destroyed the three remaining loyal legions on the '''Drop Site Massacre'''.{{Cite Marker EndFn|1a}}. After that the Iron Warriors were let loose and Perturabo relished the opportunity to fight in a way that did not rely on massive sieges and trench warfare. Because of their massive deployment throughout the galaxy, dozens of [[Warsmith]]s took over planets and demanded tithes to support the heresy.
====Iydris====
After fleeing Terra following Horus's death, Perturabo took the opportunity to take vengeance on the Imperial Fists with a trap on [[Sebastus IV]]. The trap was known as the Eternal Fortress, a keep 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".
Rogal Dorn expected an honourable battle, but this was not to be. Beginning by isolating the four Companies of the Imperial Fists 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 centre of the 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, surrounded by twenty miles of killing ground. 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.{{Cite Marker EndFn|1a}}
[[file:Perturabo.jpg|thumb|230px|right|Perturabo - Iron Warriors Primarch, during the Horus Heresy]]
The siege of the Eternal Fortress (later referred to as the "[[Iron Cage]] Incident") lasted for a further three weeks. Relief came in the form of Roboute Guilliman and the Ultramarines, who drove off the Iron Warriors, but the siege left Rogal Dorn a broken man and rendered the Imperial Fists Chapter unable to fight for nineteen years. The gene-seed of over 400 Imperial Fists was sacrificed to the Dark Gods, and Perturabo was elevated to the rank of [[Daemon Prince]] of [[Chaos Undivided]] {{Fn|1a}}.
