Katharine Ross repeats her portrayal of Etta Place (from "Butch Cassidy and the Sundance Kid") in this adventure of the fugitive who, alone and desperate following the deaths of Butch and Sundance, seeks help from Pancho Villa in exchange for guns and ammunition.

James Arness rides again as Matt Dillon, the US Marshal he made popular in the 1955-75 TV series. In this movie he goes after a renegade Apache named Wolf who has taken his daughter captive. As a bargaining chip, Dillon helps two sons of Apache chief Geronimo out of the fort stockade and offers them in trade. Dillon is aided by an Army scout, Chalk Brighton.