Fort Sumter SC Fort Sumter is where the first shots were fired to start the Civil War. The fort is located in Charleston Harbor. On April 12, 1861 at 4:30 AM, after weeks of tension as the Confederates demanded the Union forces under Major James Anderson, abandon the fort, Confederate commander P. G.T. Beauregard fired on the fort. By 2 PM the next day, the US forces surrendered the fort. Much of Fort Sumter is in ruins. The first shots were fired from the water directly ahead in this picture. Several casemate cannons 12-pounder Mountain Howitzer 8-inch (200 Pounder) Parrott 15-inch Rodman 8-inch Columbiad 10-inch mortar, Model 1819 This flag flew over Fort Sumter during the bombardment of April 12-13, 1861.