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 fort. When the Civil War ended, Fort Sumter was in ruins. The U.S. Army worked to restore it as a useful military installation. The damaged walls were re-leveled to a lower height and partially rebuilt. The third tier of gun emplacements was removed. Eleven of the original first-tier gun rooms were restored with 100-pounder Parrott rifles. From 1876 to 1897, Fort Sumter was used only as an unmanned lighthouse station. The start of the Spanish–American War prompted renewed interest in its military use and reconstruction commenced on the facilities that had further eroded over time. A new massive concrete blockhouse-style