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Thunder in the Valley is a 1947 American Technicolor drama film directed by Louis King and starring Lon McCallister, Peggy Ann Garner and Edmund Gwenn. It is based on the 1898 novel Owd Bob by Alfred Ollivant, which has previously been adapted into a 1938 film of the same title. The film was produced and distributed by 20th Century Fox and cost a reported $1.9 million. It was released in Britain under the alternative title Bob, Son of Battle.