Burnside's bridge just after the Battle of Antietam, 1862.
Unknown author<span style="display: none;">Unknown author</span>
File from <i><a rel="nofollow" class="external text" href="https://archive.org/stream/photographichist01mill#page/n76/mode/2up">The Photographic History of The Civil War in Ten Volumes: Volume Two, Two Years of Grim War</a></i>. The Review of Reviews Co., New York. 1911. p. 76.