Overview
Black Reach is a civilised world whose name became shorthand for ork incursion and Astartes counter-assault.
Ultramarines intervention broke the WAAAGH! that overran it, at the usual price paid by the people who lived there.
Its rebuilt cities watch the void with justified suspicion.
M41 and M42 status
Civilised world scarred by ork incursion.
Rebuilt frontier world within Ultramar's shadow.
Timeline
WAAAGH! Zanzag's Goff Orks overrun Black Reach's outer settlements.
The Ultramarines 2nd Company under Captain Cato Sicarius shatter the WAAAGH!'s leadership.
Reconstruction continues under Ultramar's regional oversight.
Frontier audits list the world as recovered and rearmed.
Cartographic positions and several administrative details are intentionally approximate where published Warhammer sources conflict or provide no canonical coordinate system.