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It was infiltrated by [[Genestealer]]s under the guise of the [[Cult of the Emperor's Light]]. Apparently from there the cult eventually infiltrated the entire Gehenna system, and were finally destroyed by a force of the [[Space Wolves]].{{Fn|1}}{{Fn|3}}

Gehenna Prime was also the site of an [[Ork]] invasion. During the war most of the Orks besieging the hive world's capital hive were drawn off by [[Imperial Guard]] armoured companies under the command of [[Colonel]] [[Born Tahal]]. This allowed Imperial reinforcements to land at the capital and break the siege a few weeks later.{{Cite This}}

Tahal's adversary was the Ork Warlord [[Hargluk]], the commander of the entire invasion. The Imperial army consisted of [[Legio Metalica]] [[Titan]]s supported by [[Blood Angels]] [[Space Marines]].{{Fn|2}}