Fort Sullivan was renamed Fort Moultrie shortly after the battle to honor Colonel William Moultrie for his successful defense of the fort and the city of Charleston . Extensively modified in the years after the battle , it was supplanted by Fort Sumter as the principal defense of Charleston prior to the outbreak of the American Civil War . In 1876 , to celebrate the centennial , companies from Savannah , Augusta , Macon , Columbia , New York and Boston were invited to Charleston . The site was turned over to the National Park Service in 1960 , and is now part of Fort Sumter National Monument .