Statistics for occurrence #1 of “Captain William Colvill” in chapter 3.9, page 147 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...e first from the left is Lieut. Colonel Stephen Miller, the next is Colonel Gorman. On his left hand is Major Dyke and next to him is Adjutant W. B. Leach. Between the last two and behind them is Captain William Colvill , while at the left hand of Adjutant Leach is Captain Mark Downie. At the extreme right of the picture stands General J. B. Sanborn with Lieutenant Sanders (mustering officer) on his right hand, and...
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