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The working title of this film was In the Darkness of the Sun. Contemporary news items and production charts add the following information about the production: RKO borrowed John Wayne from Republic Pictures and clothes designer Michael Woulfe from William Cagney's company for the picture. Maureen O'Hara was the film's original female lead, but was replaced by Laraine Day because of a scheduling conflict. Earle S. Dewey is listed as a cast member, but his appearance in the final film has not been confirmed. Although RKO announced in Hollywood Reporter that the entire production was to be shot by cameraman George Barnes in RKO's Churubusco Studios near Mexico City, other news items indicate that location shooting was done in Lone Pine and five other points in California's Owens Valley. Barnes was not credited onscreen or in production charts and probably did not participate in the final film. Location filming reportedly broke expenditure records for RKO, with $65,000 being spent for a mock road strip and train tunnel. In addition, a fake mountain was built in Lone Pine, with Mt. Whitney as the backdrop. In mid-April 1947, Day "collapsed" during filming in Lone Pine, forcing director Richard Wallace to shoot around her. Modern sources note that the total production cost was $3,209,000, an RKO record, and the film lost $1,035,000 at the box office.