Greene's brilliant southern campaign reversed the course of the war. His liberation of most of the south revived Patriot morale. His integration of partisan and conventional warfare upset British strategy and drove the British high command into risky improvisations. Charles Cornwallis attempted to make the most of his retreat from the Carolinas by turning Virginia into a major theater of war. Basing himself on the Chesapeake, he made himself vulnerable to a decisive counterstroke launched by George Washington and the French.