General Map of Charleston Harbor showing Rebel Defences and Obstructions
prepared by party under Charles Boutelle, Asst. U.S.C.S., and drawn by E.
Willenbucher. A note to the west of Ft. Moultrie shows where the Coast Survey
Steamer BIBB had a torpedo (mine) explode under it during clearing of the harbor
on March 16, 1865. The BIBB survived with little damage and no casualties.