Description: Fort Pentagon: 1756, Oneida County, Rome. More commonly called Fort Craven. French and Indian War, On the Oneida Carry/Portage (Rome). Construction started June 1756. A pentagon shaped fort just south of Fort Williams to replace it. Major earthen fortifications 9 feet wide and timber faced. Three of five bastions were completed. Destroyed by British 20 Aug 1756 after French took Fort Oswego. See map at Oneida Carry.