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Upon taking command of his Legion, Perturabo reviewed the war record of his new forces. After heavily analyzing their record, effectiveness, doctrines, and practices, Perturabo found them wanting. His punishment was decimation. By lottery, one in every ten Legionaries was chosen to be beaten to death by his comrades. Such would be Perturabo's reign: brutal and unforgiving.{{Fn|9}}Perturabo went on to lead his new Iron Warriors on a lightning crusade against the planet of [[Justice Rock]] and its heretical [[Black Judges]].

Perturabo led 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 Iron Warriors constant reminders of the perfection of the defences on [[Terra]]. The other primarchs also kept Perturabo at a lightning crusade against 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 planet defences of [[Justice RockOverdogg Mashogg]] , an [[Ork]] [[Warboss]] under attack by [[Leman Russ (primarch)|Leman Russ]], leader of the [[Space Wolves]], and its heretical [[Black JudgesJaghatai Khan]], Khan of the [[White Scars]]{{Cite This}}.  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 legions 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|12}} 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 This}}.

Shortly after the Sak'trada Deeps Campaign Perturabo was leading his Iron Warriors on a campaign to cleanse the [[Hrud]] Warrens on [[Gugann]] when he received news learned that his home worldhomeworld, Olympia, was in rebellion. Dammekos was long dead but demagogues had brought the people together and risen in arms. The thought of being the only primarch who could not control his own homeworld appalled him. Horus made the most of the opportunity by presenting Perturabo with a hammer named [[Forgebreaker]], the gift symbolic of a signing of a pact between them. Perturabo purged Olympia city by city, overrunning the fortresses he had built and sparing no one. By the time the massacre was over, five million Olympians had been killed and the rest put into slavery. 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]], destroying the Hrud one moment and the next they were committing genocide. Perturabo realized the Emperor could never forgive him for what he had done{{Cite This}}. Horus on the other hand commended Perturabo for his decisive action and the Lord of Iron swore an oath of loyalty to the [[Warmaster]].{{Fn|7}}

*{{Endn|12}}: [[Perturabo: The Hammer of Olympia (Novel)]] Chapter Chapters 7-11