Statistics for occurrence #1 of “Captain O. M. Poe” in chapter 12, page 251 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.:

... and though they had no regular engineer troops under them, the volunteers who received training from these officers proved their worth. The army under Sherman had with it nine able engineers under Captain O. M. Poe , under whose supervision a number of the photographs which are reproduced in this work were taken. He fortified many strategic points, made surveys and issued maps, reconnoitered the positions of t...
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