Fort Barrancas mostly by enslaved African-American workers. January 8, 1861, more than three months before the American Civil War officially started at Fort Sumter, South Carolina, a company of 50 U.S. Army soldiers stationed at Fort Barrancas, under the command of John H. Winder fired upon a militia. This militia was Florida state troops under Colonel William Henry Chase demanding that the U.S. troops surrender the fort. Lieutenant Adam J. Slemmer, acting commander in Winder's absence, had the troops fire shots meant to repel the militia. Lt Slemmer knew that Fort Pickens was easier to defend, so he spiked the guns at
Fort Sumter after General Thomas Sumter, Revolutionary War hero, Fort Sumter was built after the War of 1812, as one of a series of fortifications on the southern U.S. coast to protect the harbors. Construction began in 1829, and the structure was still unfinished in 1861, when the Civil War began. Seventy thousand tons of granite were transported 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, long, with walls thick, standing over the low tide mark. It was designed to house 650 men and