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.
After being freed from a Vietnamese war prison, French Lt. Col. Pierre Raspeguy is sent to help quell resistance forces in Algeria. With the help of the Capt. Esclavier, who has grown weary of war, and Capt. Boisfeuras, who lives for it, Raspeguy attempts to convert a rugged band of soldiers into a formidable fighting unit, with the promise of marrying a beautiful countess if he's made a general.