Valley Forge National Historical Park is the site of the third winter encampment of the Continental Army during the American Revolutionary War from December 19, 1777 to June 19, 1778. The National Park Service preserves the site and interprets the history of the Valley Forge encampment. The park contains historical buildings, recreated encampment structures, memorials, museums, and recreation facilities.

The Continental Army was the army of the United Colonies representing the Thirteen Colonies and later the United States during the American Revolutionary War. It was formed on June 14, 1775 by a resolution passed by the Second Continental Congress, meeting in Philadelphia after the war's outbreak. The Continental Army was created to coordinate military efforts of the colonies in the war against the British, who sought to maintain control over the American colonies. General George Washington was appointed commander-in-chief of the Continental Army and maintained this position throughout the war.