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In page Paths of Glory:

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After Schary was fired by MGM in a major shake-up, Kubrick and Harris managed to interest Kirk Douglas in a script version that Kubrick had done with Calder Willingham. After reading the script, Kirk Douglas was impressed and managed to get an advance for a $1 million budget from United Artists to help produce the film.[3]  Of the roughly $1 million budget, more than a third was allocated to Kirk Douglas' salary.[4]  Prior to the involvement of Douglas and his Bryna Production Company, no studio had showed interest in the seemingly noncommercial subject matter and filming in black and white.[5]  MGM rejected the idea of the film based on fears that the film would be unfavourable to European distributors and audiences.[4] United Artists agreed to back it with Douglas as the star.[6]