Galois is practicing shooting in preparation for a duel the very next day. His last night.

David learns that his mother has cancer and only two months to live. He decides not to let her know.

In June 1944, a young doctor, Chevalier, under the threat of guns, is forced to treat a wounded man in a camp of resistance fighters (maquisards). He recognizes the man, minister of the Third Republic, called Morel by his companions. Carnot, the chief of the maquisards, is suspicious of a doctor who expressly disapproves of the resistance and wants to have him shot as soon as he has treated Morel. Philippe, who is second in command, intervenes in favor of the Chevalier. Meanwhile, peasants denounce the maquisards to the Nazis and the camp is surrounded by the Germans. The camp is saved thanks to Philippe who takes command of the group. He decides to leave the shelter and they begin the long march through the Cévennes to rally maquisard Napoleon in the Vercors...