Starting in 1779, the British initiated a southern strategy to begin at Savannah, gather Loyalist support, and reoccupy Patriot-controlled territory north to Chesapeake Bay. Initially the British were successful, and the Americans lost an entire army at the Siege of Charleston, which caused a severe setback for Patriots in the region. But then British maneuvering north led to a combined American and French force cornering a second British army at Battle of Yorktown, and their surrender effectively ended the Revolutionary War.