Statistics for occurrence #1 of “Whitefield, New Hampshire” in chapter 7, page 226 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 10: The Armies and the Leaders.:

...tersburg until December 3, 1864, when it was discontinued. The white troops were merged in the Twenty-fourth and the colored ones in the Twenty-fifth Corps. (U. S. M. A. 1846) was born in Whitefield, New Hampshire , May 27, 1823. He rendered able service in the Mexican War, taught engineering at West Point, suporintended Government works, and was one of the officers garrisoned at Fort Sumter during the siege....
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