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Brandywine Dooms Philadelphia
After defeating General Washington at the Battle of Brandywine on Sept. 11, 1777, General Howe captured and occupied the city of Philadelphia on Sept. 26, 1777.
Vally Forge
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.
Washington was defeated in Brandywine on September 11, 1777
George Washington, at the time a general, inaccurately gauged the British forces, believing them to be a lot smaller. The British employed a flanking maneuver, where the army was split into 3 parts. One to march head on to the Americans, with the attention focused on them. Oblivious to the Americans, the other two parts came up from behind on either side.
Philadelphia campaign happened in 1777.
The British captured Philadelphia in 1777. The leaders of the British troops were William Howe and Henry Clinton and for the United States it was George Washington and Nathanael Greene.
1777???
In 1777, Washington's troops had their winter quarters there. The main reason is because George Washington wanted to keep look out for the British army to know what they were up to and what they were going to do next. Valley Forge was close enough to Philadelphia to manage this.
In 1777 they did not have a president, Washington was elected in '89
September 1777