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The working title of this film was To the Last Man. In the opening credits, Zane Grey's name appears above the title. Modern sources state that because of competition with a proposed Liberty Films production, RKO was forced to change the picture's title from To the Last Man to Thunder Mountain. Although Grey's novel Thunder Mountain is listed as the film's source in some publications, onscreen credits do not specify a particular Grey work, and the film's plot more closely resembles that of To the Last Man than Thunder Mountain. Some scenes were shot on location in Lone Pine, CA. With Tim Holt's return to filmmaking following four years of service in the Army Air Corps, RKO reinstated its "Tim Holt" western series, which it had started in 1940. Richard Martin's "Chito Rafferty" character was the only character the studio continued from the earlier series. According to Hollywood Reporter, James Warren was originally set to star in the picture and Lesley Selander, who directed many later Tim Holt Westerns, was to direct. For more information on RKO's Tim Holt westerns, for Wagon Train. In 1923, Victor Fleming directed Richard Dix and Lois Wilson in a silent Parmount version of Grey's novel, called To the Last Man (see AFI Catalog of Feature Films, 1921-30; F2.5749). In 1933, Henry Hathaway directed Egon Brecher and Fuzzy Knight in a second Paramount adaptation of the novel, also titled To the Last Man (see AFI Catalog of Feature Films, 1931-40; F3.4641).