The siege of Augusta took place between May 22, 1781, and June 6, 1781. American Patriot forces, led by General Andrew Pickens and Colonel Henry "Light Horse Harry" Lee, were successful in capturing Augusta, Georgia held by British loyalist militia. Fort Cornwallis, the primary British defence, was successfully exposed to cannon fire by the construction of a tower 30 feet (9.1 m) high on which the Americans mounted a small cannon. The British surrendered on June 6.