[170] In February 1777, word reached London of the American victories at Trenton and Princeton, and the British realized the Patriots were in a position to demand unconditional independence.[171]

Brandywine, Germantown, and Saratoga
Main articles: Battle of Brandywine, Battle of Germantown, and Battle of Saratoga
In July 1777, British General John Burgoyne led the Saratoga campaign south from Quebec through Lake Champlain and recaptured Fort Ticonderoga intending to divide New England, including control of the Hudson River. However, General Howe in British-occupied New York blundered, taking his army south to Philadelphia rather than up the Hudson River to join Burgoyne near Albany.[172] Meanwhile, Washington and Gilbert du Motier, Marquis de Lafayette rushed to Philadelphia to engage Howe and were shocked to learn of Burgoyne's progress in upstate New York, where the Patriots were led by General Philip Schuyler and successor Horatio Gates. Washington's army of less experienced men were defeated in the pitched battles at Philadelphia.[173]
Howe outmaneuvered Washington at the Battle of Brandywine on September 11, 1777, and marched unopposed into the nation's capital at Philadelphia. A Patriot attack failed against the British at Germantown in October. 