In the Arizona Territory of the 1880s, rancher Dan Evans (Van Heflin) and his young sons witness a stagecoach holdup. The boys want to try to intervene, but their father warns them that it would be useless to act when they are so heavily outnumbered. When the stagecoach driver overpowers one of the robbers and uses him as a human shield, Ben Wade (Glenn Ford), the leader of the gang, callously shoots both men dead.