Statistics for occurrence #1 of “Fort Whipple” in chapter 8, page 152 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...defiantly above the parapet. But there are no longer any Confederates to defy. The nation is again under one flag, as former Confederate leaders proved by leading Union troops to victory in 1898. Fort Whipple was a mile and a half southwest of the Virginia end of the Aqueduct bridge. It was a semi-permanent field work, completely closed, having emplacements for forty-one heavy guns. The gun in the fo...
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Fort Whipple (Arizona, United States) 67 8 1 0 0 user votes

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