George Washington

1777 campaigns
In the late summer of 1777 the British under John Burgoyne sent a major invasion army south from Quebec, with the intention of splitting off rebellious New England. General Howe in New York took his army south to Philadelphia instead of going up the Hudson River to join with Burgoyne near Albany. It was a major strategic mistake for the British, and Washington rushed to Philadelphia to engage Howe, while closely following the action in upstate New York. In pitched battles that were too complex for his relatively inexperienced men, Washington was defeated. At the Battle of Brandywine on September 11, 1777, Howe outmaneuvered Washington, and marched into the American capital at Philadelphia unopposed on September 26. Washington's army unsuccessfully attacked the British garrison at Germantown in early October. Meanwhile, Burgoyne, out of reach from help from Howe, was trapped and forced to surrender his entire army at Saratoga, New York.^[70] It was a major turning point militarily and diplomatically. France responded to Burgoyne's defeat by entering the war, openly allying with America and turning the Revolutionary War into a major worldwide war. Washington's loss of Philadelphia prompted some members of Congress to discuss removing Washington from command. This attempt failed after Washington's supporters rallied behind him.^[71]
Valley Forge
Main article: Valley Forge
Washington's army of 11,000^[72] went into winter quarters at Valley Forge north of Philadelphia in December 1777. Over the next six months, the deaths in camp numbered in the thousands (the majority being from disease),^[73] with historians' death toll estimates ranging from 2000^[73] to 2500^[74][75] to over 3000 men.^[76] The next spring, however, the army emerged from Valley Forge in good order, thanks in part to a full-scale training program supervised by Baron von Steuben, a veteran of the Prussian general staff. The British evacuated Philadelphia to New York in 1778, shadowed by Washington. Washington attacked them at Monmouth, fighting to an effective draw in one of the war's largest battles. Afterwards, the British continued to head towards New York, and Washington moved his army outside of New York.