After the American Civil War, mercenaries travel to Mexico to fight in their revolution for money. The former soldier and gentleman Benjamin Trane meets the gunman and killer Joe Erin and his men, and together they are hired by the Emperor Maximillian and the Marquis Henri de Labordere to escort the Countess Marie Duvarre to the harbor of Vera Cruz. Ben and Erin find that the stagecoach is transporting three million U.S. dollars in gold hidden below the seat, and they scheme to steal it. Along their journey, betrayals and incidents happen changing their initial intentions.