I work at another HQ of Washington's in the Hudson Valley. From my experiences, I have found that the letters of Washington hold information about his various locations throughout the war. I would visit the Library of Congress website (loc.gov) and review his letters from 1777 to find out where he was.
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The battle of Philadelphia began on the night of September 25, 1777. The British captured Philadelphia the following day and occupied the city until June 18, 1778.
1777
Camp Valley Forge is where General Washington stayed the winter of 1777-1778, and ended up suffering many hardships.
In 1777, the British' attempt to cut New England off from the rest of the colonies failed when Burgoyne surrendered his army at Saratoga.
It was after the second of the two Battles of Saratoga that General Burgoyne of Great Britain surrendered his men. This occurred on October 7, 1777.