1-Orlando-Poe-map-of-1864-showing-Union-Army-Bridges

The two Union Army bridges as shown on “Topographical map of the Approaches and Defenses of Knoxville, E. Tennessee, surveyed by Capt. O.M. Poe, Chief Engineer Dept. of the Ohio, during Dec., Jan., and Feb., 1863-1864.” (Library of Congress.)