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In page Two Flags West:

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The role of the major was meant to be played by Lee J. Cobb who owed 20th Century Fox a film. (He had recently ended a long term contract with the studio after refusing to make Where the Sidewalk Ends.) However Cobb was replaced by Jeff Chandler, who had a six-film contract with Fox after making Broken Arrow of which this was the second movie. He had to commute from Hollywood to the location because of his radio commitments.[1][2]