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In this Matthew Brady photograph, a nine-inch Dahlgren gun on a slide-pivot mounting is seen in operation aboard a U.S. Navy warship during the Civil War
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Navy Historical Center -- In this Matthew Brady photograph, a nine-inch Dahlgren gun on a slide-pivot mounting is seen in operation aboard a U.S. Navy warship during the Civil War. A similar gun, originally mounted on the famous Confederate ironclad CSS Virginia, was recently loaned to the Fredericksburg Area Museum, Fredericksburg, Va., for a three-year exhibit. On March 9, 1862, CSS Virginia battled the Union ironclad USS Monitor in the famous Battle of Hampton Roads, an action in which the two ships fought to a virtual draw and revolutionized sea warfare. U.S. Navy file photo.

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