Lyon Gaultier is a deserter in the Foreign Legion arriving in the USA entirely hard up. He finds his brother between life and death and his sister-in-law without the money needed to heal her husband and to maintain her child. To earn the money needed, Gaultier decides to take part in some very dangerous clandestine fights.

Alain Lefevre is a boxer paid by a Marseille mobster to take a dive. When he wins the fight he attempts to flee to America with the mobster's girlfriend Katrina. This plan fails and he seeks escape by joining the foreign legion. As part of the legion he tangles with abusive lieutenant Steinkampf and bonds with legionnaires Luther, Mackintosh and Rosetti.

Hans is a street fruit peddler and born-loser. His choice of career upsets his bourgeois family, causing him to turn to drinking and violence. After recovering from a debilitating heart attack, his business finally begins to take off. However the more he becomes a credit to his family, the more depressed he becomes.