A plains drifter cowboy single-handedly rescues a local nun from a gang of attackers. After meeting a band of Mexican revolutionaries, who are resisting the French occupation of Mexico, the cowboy and Sister Sara decide to join forces with the freedom fighters and set off on a deadly mission to capture the enemy's garrison. But along the way the soft spoken hero discovers that the nun is not what she seems.

Railroad workers have not been paid for months because Whitey and his gang keep holding up the train.

An engaging frontiersman attempts to track down his father's murderer and the whereabouts of his one-of-a-kind rifle, the Winchester '73, as it passes among a rogue's gallery of owners including a crazed highwayman, an immoral gunrunner, a young Indian chief, and Stewart's own murderous brother.