Shock Troops (1967)

A French resistance group frees twelve captured soldiers from a German prison camp, but apparently there is an additional prisoner among them who is suspected of being an enemy spy.

Directed by: Costa-Gavras

Starring: Charles Vanel, Bruno Cremer, Jean-Claude Brialy, Michel Piccoli, Gérard Blain, Claude Brasseur

Links: IMDb, Movie posters, Movie stills