Mass Effect: Ghosts
A human farming colony in the Attican Traverse, Mindoir was raided in 2170 by Batarian slavers, who slaughtered most of the colonists. Those not fortunate enough to die immediately were subjected to horrific cranial implants that the Batarians used to control them. The Alliance dispatched troops to drive the Batarians out, but their defenses were too strong. The Marines were pinned down, forced to watch the suffering colonists but unable to reach them. The atrocity on Mindoir may have been a Batarian retaliation against humanity’s aggressive colonization of worlds in the Skyllian Verge.