A concise biography for elementary-school students of Sergeant William Jasper, one of South Carolina's Revolutionary War heroes. As British guns shelled the little palmetto fort of Sullivan s Island known as Fort Moultrie, enemy fire broke the flag pole causing it to fall outside of the fort. Sergeant William Jasper leapt over the wall and saved the flag as cannons boomed and rifle fire showered around him. The blue flag , with the added palmetto tree design, has since served as the South Carolina state flag