However, Rawdon was forced to begin a gradual retreat to Charleston. He relieved the Siege of Ninety-Six, evacuating its small garrison and conducting a limited pursuit of American troops. He withdrew his forces to Charleston. In July 1781, in poor health, he gave up his command. On his return to Great Britain, he was captured at sea by François Joseph Paul de Grasse, but was exchanged. After Rawdon's departure, the British evacuated Charleston as the war drew to a close. They took thousands of Loyalists and freed slaves with them, having promised freedom to slaves of rebels who joined their lines, resettling these groups in Nova Scotia and the Caribbean.