The Continental Congress appointed Washington commander-in-chief of the American revolutionary forces in 1775. The following year, he forced the British out of Boston, lost New York City, and crossed the Delaware River in New Jersey, defeating the surprised enemy units later that year. As a result of his strategy, Revolutionary forces captured the two main British combat armies at Saratoga and Yorktown. Negotiating with Congress, the colonial states, and French allies, he held together a tenuous army and a fragile nation amid the threats of disintegration and failure. Following the end of the war in 1783, Washington returned to private life and retired to his plantation at Mount Vernon, prompting an incredulous King George III to state, "If he does that, he will be the greatest man in the world."