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The working title of this film was Fire in the Night. Helen MacInnes' novel was serialized in The Saturday Evening Post from 2 May to June 20, 1942. When M-G-M bought the screen rights in February 1942, the novel was titled Cross Channel. French screen star Pierre Aumont made his American acting debut in this film, as did Swedish actress Signe Hasso. Like the character he plays in Assignment in Brittany, Aumont fought with the Free French forces in Tunisia, Italy and France. He was awarded both the Legion of Honor and the Croix de Guerre. Hollywood Reporter news items and production charts add the following information about the production: John Carradine was announced as one of the film's stars in August 1942. In mid-October 1942, production shut down for several days due to director Jack Conway's flu. The following actors were announced as cast members: Blanche Yurka, Wolfgang Zilzer, Byron Nelson, George Ford, Vernon Rickard, Jack Lorenz, Alan Westcott, George Calliga, George Magrill, Max Lucke, Waclaw Rekwart, Alex Akimoff, Helen Giere, Cap Somers, Bob Ireland, John Peters, Bruce Carruthers, Florence Brown, Richard Carpenter, Michael Macey, Claude Payton, Art Belasco, John Phipps, Esther Fleischman and Lillian Nicholson. Their appearance in the final film has not been confirmed. In November 1942 Hollywood Reporter production charts, Ben Lewis is listed as editor instead of the credited Frank Sullivan, and Paul Groesse is listed as associate art director instead of the credited William Ferrari.