Map of Seige of Port Hudson
<a href="https://en.wikipedia.org/wiki/Robert_Knox_Sneden" class="extiw" title="w:Robert Knox Sneden"><b>Sneden, Robert Knox</b></a>, 1832-1918, map-maker for the Union Army.
1863
<a rel="nofollow" class="external text" href="https://www.loc.gov/item/gvhs01.vhs00139/"><b>Library of Congress</b></a>