Map of the harbor and city of Charleston, S.C., showing its defenses, and the position of the sunken vessels closing the entrance to the great ship channel, and also the portion of the city lately destroyed by fire

Map of Charleston Harbor, with inset detail showing the positions of the Stone Fleet, and an accompanying paragraph clipped from a newspaper from April 1861. The Stone Fleet was a collection of whaling ships in poor condition bought by the Northern defense forces during the Civil War, filled with stone, and sunk in Charleston Harbor, with the aim of forming sand shoals and blocking off access to the harbor. However, they failed in this goal.