Dave Harmon (Clint Walker), a former lieutenant in the U.S. Army is sent to Yuma as the new United States Marshal. His wife was raped and son killed and the only description of the criminals responsible was they were wearing army uniforms. He has served in several locations as U.S. Marshal and all were near an army post. Yuma is a city with an army post commanded by Major Lucas (Peter Mark Richman) and an Indian reservation nearby.
