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The '''Ark Reach Cluster''' was a group of binary stars discovered by the [[Expedition Fleet|47th Expeditionary fleet ]] during the [[Great Crusade]]. It contained 6 systems linked together by trade and mutually supported defence networks. {{Fn|1b}}

The planetary governments rejected an offer of joining the Imperium and were thus gained through wars of compliance. The first 4 systems fell to the 47th Expedition including the [[Word Bearers]] and [[Space Wolves]] Legions. The fifth and sixth world, [[Ark Reach Secundus|Shrike]], included the assistance of the [[Thousand Sons]].^{{Fn|1a}}{{Fn|1b}}

*¹:[[A Thousand Sons]] by [[Graham McNeill]] **^{{Endn|1a}}: Chapter 1**{{Endn|1b}}:Chapters 1, 11-12 [[Category:Planetary Systems]]