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Working titles for this film were Hold High the Torch and Blue Sierra. The film was copyrighted as Blue Sierra and was reviewed as such by Variety. The onscreen credits contain the following written acknowledgment: "We tender our appreciation to the office of the Quartermaster General, Army of the United States, for cooperation in parts of this production." Despite its title, the picture contains no reference to a dog character named Lassie, although the character of "Bill" is played by Lassie. September 1944 Hollywood Reporter production charts list actor Edmund Gwenn in the cast, but he did not appear in the final film. Hollywood Reporter production charts also list actor Paul Langton in the cast, but his appearance in the released film has not been confirmed. According to a June 1944 Hollywood Reporter news item, the film was originally to star Margaret O'Brien and Lionel Barrymore. For additional information on other films featuring Lassie, please consult the Series Index and see the entry below for Lassie Come Home.