Statistics for occurrence #1 of “Captain O. M. Poe” in chapter 12, page 250 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.:

...portant position impregnable. Knoxville, Tennessee, likewise withstood terrific onslaughts, having been fortified with great skill. The army under Sherman had with it nine able engineers, under Captain O. M. Poe , who labored constantly in the construction of defenses for the numerous bridges along the line of railroad, fortified many strategic points, made surveys and issued maps, reconnoitered the positions...
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