New York's strategic central location and port made it key to controlling the colonies. The British assembled the century's largest fleet: at one point 30,000 British sailors and soldiers anchored off Staten Island. General George Washington barely escaped New York City with his army in November 1776; General Sir William Howe was successful in driving Washington out, but erred by expanding into New Jersey. By January 1777, he retained only a few outposts near New York City. The British held the city for the duration, using it as a base for expeditions against other targets.