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In page M7 Priest:

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During the Battle of the Bulge, each U.S. armored division had three battalions of M7s, giving them unparalleled mobile artillery support.[7] A total of 3,489 M7s and 826 M7B1s were built. They proved to be reliable weapons, continuing to see service in the U.S. and allied armies well past World War II.[8][9]