Statistics for occurrence #1 of “Lieutenant Wilson” in chapter 1.3, page 63 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.:

...uartermaster; Lieutenant H. C. Strong, assistant quartermaster; Brigadier-General James Barnes; Major A. G. Brady, provost-marshal; Dr. T. H. Thompson, surgeon; Captain J. W. Welch, ordnance officer; Lieutenant Wilson , aide-de-camp; and the last is Lieutenant J. T. Cantwell, engineer.
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