Colonel Pembroke, having surrendered Fort Holman to the Confederacy without engaging in any combat, finds himself confronted with public humiliation and the looming threat of a court-martial. His only chance to redeem himself lies in reclaiming the fort from the tyrannical Major Ward, who currently holds its power. Desperate for assistance, Pembroke assembles an unlikely team of condemned men, offering them freedom as a reward if they manage to survive. Amidst internal conflicts and discord, the group gradually unites, preparing for the decisive assault.