Washington's Headquarters at Morristown
The Ford Mansion is part of the Morristown National Historical Park, and is located on a hilltop in Morristown, New Jersey. The Ford Mansion was the "hard winter" (from December 1779 - May 1780) quarters of George Washington and the Continental Army. That winter remains the coldest on record for New Jersey.
Benson John Lossing, ed. Harper's Encyclopedia of United States History (vol. 10) (New York, NY: Harper and Brothers, 1912)