When Cornwallis left Greensboro for Wilmington, he left the road open for Greene to begin the American reconquest of South Carolina. This he achieved by the end of June, in spite of a reverse sustained at Lord Rawdon's hands at Hobkirk's Hill (2 miles north of Camden) on April 25. From May 22 to June 19, 1781 Greene led the Siege of Ninety-Six, which he was forced to abandon when word arrived that Rawdon was bringing troops to relieve the siege. However, the actions of Greene and militia commanders like Francis Marion drove Rawdon to eventually abandon Ninety Six and Camden, effectively reducing the British presence in South Carolina to the port of Charleston. The town of Augusta, Georgia was also besieged on May 22, and fell to Patriot forces under Andrew Pickens and Harry "Light Horse" Lee on June 6, reducing the British presence in that state to the port of Savannah.