The park includes the site of George Washington's crossing of the Delaware River at Johnson's Ferry. This is where George Washington and a 2,400-man detachment of the Continental Army crossed the river overnight on December 25, 1776, and into the morning of December 26, 1776, to make a surprise attack on Trenton, a move that would prove to be a turning point in the American Revolutionary War. The corresponding ferry on the Pennsylvania side of the Delaware River was known as McConkey's Ferry.