Statistics for occurrence #1 of “Colonel O. M. Poe” in chapter 2 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 8: Soldier Life and Secret Service.:

...casionally slept in his Camp with the army. The lefthand of the three center pictures shows the What-is-it? again, on the Bull Run battlefield; in the next appears the developing tent of Barnard, Colonel O. M. Poe 's engineer-corps photographer, before one of the captured Atlanta forts, in September, 1864; and in the last stands Cooley, photographer to the Army of the Tennessee, with his camera, on the battered...
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