This map is one of twenty-four military maps and drawings in a collection of papers from Confederate General P.G.T. Beauregard. The map dates from 1865.
Citation: Map of the Defences of Charleston and Harbor showing the works erected by the U.S. forces in 1863 and 1864. To accompany the report of Major Genl. Q. A. Gillmore, U.S. Volunteers. AMs 1168/11