The Path of Honor(1939)

Original title: Le Chemin de l'honneur

Two twin brothers have joined the army, Paul by vocation is a lieutenant of spahis and Georges to escape the police is a sergeant in the Foreign Legion. A snitch having informed the police of Georges' presence at the Legion, he must leave. In Casablanca, Paul helps his brother escape the police by taking his identity to allow him to regain his honor.