Statistics for occurrence #1 of “First-Lieutenant William P. Wright” in chapter 4 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.:

... is Andrew Cowan (later brevet-lieutenant-colonel), then lieutenant commanding the battery (he had been promoted to captain at Lee's Mills, but had not yet received his captain's commission). Next is First-Lieutenant William P. Wright (who was disabled for life by wounds received in the battle of Gettysburg), Lieutenant William H. Johnson (wounded at Gettysburg and mortally wounded at Winchester), and Lieutenant Theodore Atkins, s...
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