 Fort Sullivan was renamed Fort <unk> shortly after the battle to honor Colonel William <unk> for his successful defense of the fort and the city of Charleston . <unk> modified in the years after the battle , it was <unk> by Fort <unk> 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 , <unk> , 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 <unk> National Monument . 
