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Bill Douglas, a mercenary during the Mexican Revolution, is hired by mine owner Garcia to escort his silver across the border into Texas. When Bill arrives at the mine, he discovers that the workers, led by Eufemio, have taken over, and they hire Bill to help them fight the Federales. The Mexican soldiers arrive to recover the mine, and Bill slaughters them with his machine gun. Ricciolo, another mercenary, thinks that Bill has a hidden cache of silver and captures him, but Eufemio and his men rescue him, leaving Ricciolo naked in the desert. Eufemio and Bill then form a partnership in which they travel around the country robbing banks and freeing peasants from the Federales. During one of their missions, Eufemio meets and soon marries a young woman named Columba, under whose influence he becomes dedicated to the revolution. Meanwhile, Bill has become wealthy from the robberies, and Eufemio and Columba decide to expropriate Bill's money for the revolution and throw him in jail. Garcia and the Mexican soldiers, tipped off by Ricciolo, attack and defeat the revolutionaries, but Eufemio and Bill escape separately. Some months later, Bill recognizes Eufemio working as a rodeo clown; Ricciolo also appears, swearing revenge on Eufemio. Bill sets up a duel between the two men, and Ricciolo is killed. Afterwards, Bill tells Eufemio that he is going to turn him in for the bounty money, but the Federales again attack and capture them both. A band of revolutionaries, led by Columba, rescue them, and after one last fight, the two men go their separate ways.