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This film's working title was To the Last Man. Hollywood Reporter news items add the following information about the production: Alexis Smith was announced as Errol Flynn's co-star, Jesse L. Lasky was to produce the film and A. I. Bezzerides was to write the screenplay. Technical advisor Alf Engen, a ski champion, also played a Nazi in the film. An June 11, 1943 Hollywood Reporter news item states that the set was closed to the public because of "high-powered love scenes," but no such scenes were in the completed film. Press releases included in the file on the film at the AMPAS Library state that 275 tons of gypsum were used to manufacture the snow effects and a 250 foot ski run was built on one sound stage. Some footage was also shot on location in Sun Valley, ID. The film marked the motion picture debut of John Forsythe. Modern sources note that William Faulkner worked on the script.