Army of Shadows (1969)

In Nazi-occupied France, a respected civil engineer and member of the Resistance is arrested and imprisoned by the Germans. He manages to escape during interrogation and return to his network's headquarters in Marseille. From there, he and his multi-talented team of resisters carry out complex operations involving travel by submarine to London, parachuting into France, hiding in a chateau in the French Alps and posing as German military personnel. Both the film's writer and director belonged to the French Resistance and it shows in this authentic, engrossing thriller.