George Washington (February 22, 1732 – December 14, 1799) commanded the Continental Army in the American Revolutionary War (1775–1783). After serving as President of the United States (1789 to 1797), he briefly was in charge of a new army in 1798. Washington, despite his youth, played a major role in the frontier wars against the French and Indians in the 1750s and 1760s. He played the leading military role in the American Revolution. When the war broke out with the Battles of Lexington and Concord in April 1775, Congress appointed him the first commander-in-chief of the new Continental Army on June 14. The task he took on was enormous, balancing regional demands, competition among his subordinates, morale among the rank and file, attempts by Congress to manage the army's affairs too closely, requests by state governors for support, and an endless need for resources with which to feed, clothe, equip, arm, and move the troops. He was not usually in command of the many state militia units. In the early years of the war Washington was often in the middle of the action, first directing the Siege of Boston to its successful conclusion, but then losing New York City and almost losing New Jersey before winning surprising and decisive victories at Trenton and Princeton at the end of the 1776 campaign season. At the end of the year in both 1775 and 1776, he had to deal with expiring enlistments, since the Congress had only authorized the army's existence for single years. With the 1777 establishment of a more permanent army structure and the introduction of three-year enlistments, Washington built a reliable cohort of experienced troops, although hard currency and supplies of all types were difficult to come by. In 1777 Washington was again defeated in the defense of Philadelphia, but sent critical support to Horatio Gates that made the defeat of Burgoyne at Saratoga possible. Following a difficult winter at Valley Forge and the entry of France into the war in 1778, Washington followed the British army as it withdrew from Philadelphia back to New York, and fought an ultimately inconclusive battle at Monmouth Court House in New Jersey. Washington's activities from late 1778 to 1780 were more diplomatic and organizational, as his army remained outside New York, watching Sir Henry Clinton's army that occupied the city. Washington strategized with the French on how best to cooperate in actions