Named after General Thomas Sumter, revolutionary war hero, Fort Sumter was built following the war of 1812, as one of a series of fortifications on the southern U.S. coast. Construction began in 1827, and the structure was still unfinished in 1861, when the Civil War began. Seventy thousand tons of granite were imported from New England to build up a sand bar in the entrance to Charleston Harbor, which the site dominates. The fort was a five-sided brick structure, 170 to 190 feet (58 m) long, with walls five feet thick, standing 50 feet (15 m) over the low tide mark. It was designed to house 650 men and 135 guns in three tiers of gun emplacements, although it was never filled near its full capacity. (from Wikipedia, for full description see here)