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 Hamilton notably the rebuilt Fort Richmond and Fort Tompkins, along with the Fort at Willets Point and the Fort at Sandy Hook. Lieutenant Thomas "Stonewall" Jackson also served at Fort Hamilton, and Captain Abner Doubleday served as the post commander in 1861, shortly after serving at Fort Sumter during the bombardment that started the Civil War. During the Civil War, Fort Hamilton's garrison expanded. A ship barrier across the Narrows assisted Fort Hamilton and its sister forts on Staten Island, now called Fort Wadsworth, in protecting the harbor against the possibility of Confederate raiders. The forts also provided troops to help