Paul-Emile Deiber

Henri La Tour after accomplishing a brilliant feat is awarded a title by King Louis XV, the Duke of Saint-Sever takes offense at it and challenges Henri to a duel. While they fight, a group of Austrian soldiers appear suddenly and the two rivals instantly unite to repel their enemies. Unfortunately, Saint-Sever is mortally wounded and, feeling he is about to die, he entreats his new friend to offer protection to Toinon, his natural daughter, whose life is being threatened... (imdb)

An actor disguises himself as a soldier during the Second World War, but is mistaken for a soldier and becomes a war hero during the Allied Liberation of France in 1944.