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From Warhammer 40k - Lexicanum
→Origins
[[Image:IV Legion.jpg|thumb|right|220px|Unification Wars-era Iron Warrior{{Fn|20e}}]]
===Origins===
Originally created as the '''IVth Legion''', the [[Space Marine Legion|Legion]] was founded atop the wreckage of a recidivist fortress on the [[Terra|Terran]] [[Auro Plateau]] of [[Sek-Amrak]]. The warlike [[GunTechno-tribeBarbarian|gun-tribes]] in the surrounding areas made up the first of the Legion's [[Space Marines|Marines]]. The early IVth Legion proved itself in the [[Unification Wars]], making its domain one of the most stalwart bastions of the [[Emperor]]. The Legion's [[gene-seed]] showed above average adaptability and a below average resistance rate to [[Bionics]]. This allowed the Legion to be one of the largest and the earliest deployed alongside the [[Dark Angels|I Legion]] and [[White Scars|V Legion]].{{Fn|20a}}
The Legion continued to distinguish itself in the conquest of the [[Sol System]] during the early days of the [[Great Crusade]], winning honours in many battles, most notably in the [[Mehr Yasht]] campaign on [[Venus]], where the IVth Legion was commanded by the Emperor himself to defeat the deadly [[Litho-Gholem]] armies of the [[War Witches]]. In light of their early successes, the Legion was given first access to new equipment being delivered from [[Mars]]. The Legion led the [[8th Expeditionary Fleet]], which distinguished itself in many campaigns. However, the Legion did not adapt their tactics to the new realities of the expanding Crusade and was called unimaginative by other [[Space Marine Legion]]s and by [[Horus]] himself. Horus however was impressed by their stubbornness and would use the Legion to fight inglorious but vital campaigns of attrition. They soon became known as the workhorse Legion, relied upon for their tenacity and to follow orders to the letter. It was during this time that the Legion began to spread itself out, garrisoning many worlds and fighting many smaller campaigns across the expanding [[Imperium]].{{Fn|20a}}
