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.
The young Alberto Ruotolo leave the country cottage to go for the sharpshooter. But the command does not pull good air, three riflemen arrogant and unruly bear much disorder as anger Marshal Nero.
Poor Mr. Murray Selwyn (Guy Middleton)! He's suffering from 'Acute Apprehension Complex' and his doctors have strongly recommended that he avoid any stress or excitement in his life.