After the disaster at Carrhae, the Roman soldiers taken by alien captors do not vanish from history. Forced into service as a military caste, the lost legions are sent across the galaxy to fight one war after another, their discipline, tactics, and identity reshaped by two millennia of alien command. David Drake's Ranks of Bronze uses this premise to fuse ancient Roman military culture with far-future warfare, imagining what survives when soldiers are severed from the civilization that formed them. The novel follows the legions as they confront alien strategy, strange battlefields, and the long burden of captivity. Its focus is on command, loyalty, adaptation, and the enduring human drive to reclaim self-determination after generations of imposed service.