A legendary Native American-hating Army captain nearing retirement in 1892 is given one last assignment: to escort a Cheyenne chief and his family through dangerous territory back to his Montana reservation.

Ray Owens is sheriff of the quiet US border town of Sommerton Junction after leaving the LAPD following a bungled operation. Following his escape from the FBI, a notorious drug baron, his gang, and a hostage are heading toward Sommerton Junction where the police are preparing to make a last stand to intercept them before they cross the border. Owens is reluctant to become involved but ultimately joins in with the law enforcement efforts