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From Warhammer 40k - Lexicanum
→History
Discovered by the 47th Expedition Fleet towards the end of the Great Crusade, Heliosa (as it was then known) was part of an extensive planetary alliance that covered the majority of the [[system]]s within the [[Ark Reach Cluster]]. When the leaders of this alliance refused to join the Imperium, the Astartes of the 47th - the [[Word Bearers]] - and their attached Army units were turned loose. For reasons unknown (although presumably because of the size to cover and the relative power of the Ark Reach resistance) a significant portion of the [[Space Wolf]] [[Legion]] were tasked to the campaign shortly afterwards, with forces from the [[Thousand Sons]] subsequently assigned to aid the compliance as well.{{Fn|1}}
Ark Reach Secundus, the Imperial designation for Heliosa, was the last holdout world in the [[subsector]] and as a result suffered military assault by formations from all three Astartes legions led by their [[primarchs]] and all the resources available to them. Once their inevitable defeat was realised the kings of Heliosa attempted to surrender, but this offer was refused by [[Leman Russ (Primarch)|Leman Russ]], who led his legion into a determined sack of the last Heliosan stronghold and slaughtered all the defenders.{{Fn|1a}}
At the conclusion of the war of compliance on Ark Reach Secundus, Major General [[Hestor Navarre]] was installed as the planetary governor. This world required a significant garrison to ensure Imperial authority was maintained.{{Fn|1b}}
