Statistics for occurrence #1 of “Harper's Ferry, Virginia” in chapter 12 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.:

... of Washington in the winter of 1861-62, and during that time received instruction in the duties which it afterward performed so well in the field. On February 24, 1862, the battalion was sent to Harper's Ferry, Virginia . There, under the greatest of difficulties, it constructed a pontoon bridge across the Potomac. The river was a raging torrent, the water being fifteen feet above the normal level, and filled wit...
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