A young couple marry in France in the 1940s and the film follows the arc of their marriage over the next decade. As France recovers from the trauma of the war, the wife finds herself increasingly caught up in acquiring material possessions while the husband prefers a more traditional lifestyle.

A certain number of French fighter pilots who will not accept the Second Armistice at Compiègne nor Vichy's orders decide to join the USSR. Once they have reached Moscow they resume training and form a squadron they call "Normandie". Reinforced in 1944, the squadron wins many victories. Following the acts of valor displayed by its pilots during the Battle of the Nieman River, it becomes the "Normandie-Niemen" squadron for the rest of times...