A Civil War era western set in an Arizona stockade. Holden is the hard-bitten Union cavalry officer who ruthlessly guards his Confederate prisoners, who are led by Forsythe. Parker is a southern spy whose job is to break the rebels out of jail by seducing Holden from his duty, which she does. When Holden discovers what's happened, he recaptures his prisoners only to be beset by hostile Mescalero Indians while trying to get everyone back to the fort. It's an old story but well-executed with lots of action.