Which British general was having trouble defeating the Americans in the south?

General Cornwallis was the British general who faced significant challenges in defeating the American forces in the southern colonies during the American Revolutionary War. His campaign in the South initially saw some successes, but he struggled with guerrilla warfare tactics employed by American forces and local militia. Ultimately, his difficulties culminated in the defeat at the Siege of Yorktown in 1781, which led to the end of major hostilities in the war.