Statistics for occurrence #1 of “Chattanooga, Tennessee” in chapter 12 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.:

...ved constantly in the Western Federal armies, and though they had no regular engineer troops under them, the volunteers who received training from these officers proved their worth. Their labors at Chattanooga, Tennessee , under Captain (afterward Colonel) Merrill, rendered that important position impregnable. Knoxville, Tennessee, likewise withstood terrific onslaughts, having been fortified with great skill. T...
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