After stopping a British siege in Boston, Massachusetts in 1776, General George Washington wanted to defend New York City and the Hudson River Valley. The British intended to control the Hudson River to brings its Royal Navy in to split the Colonies and end the rebellion. In 1776, soldiers fortified a site called Fort Constitution, which would be renamed Fort Lee to honor General Charles Lee. Lee achieved a victory in Charleston, South Carolina. Opposite of Fort Lee was Fort Washington. The British brought the Rose and the Phoenix, two ships, into the Hudson River. Since firing from Fort Washington did little to halt the ships, work continued faster on Fort Lee.
The British continued to encroach on American territory, taking New York City and Manhattan. In November 1776, the British also took Fort Washington and captured 3,000 American troops. After losing Fort Washington, Washington ordered the commander of Fort Lee, Nathaniel Greene, to evacuate. George Washington heard that the British army was advancing and ordered an immediate retreat of Fort Lee, leaving supplies and artillery behind.
Monument Park has numerous historical markers. The Palisade Avenue entrance of Monument Park has a historical marker dedicated to George Washington's time at Fort Lee and a historical marker for General Hugh Mercer who constructed Fort Lee on October 18, 1776. General Nathaniel Greene, commander of Fort Lee, and John Black Jack Pershing who was the keynote speaker at the 1908 dedication of Monument Park also have historical markers at the Palisade Avenue entrance. Palisade Avenue also has a monument dedicated to the Soldiers of the American Revolution.
The Parker Avenue southern entrance to Monument Park has a historical marker for General Henry Knox, Commander of the Continental Army Artillery. Also on the southern entrance a historical marker for General Horatio Gates, Brigadier General and Adjutant General of the Continental Army.
Parker Avenue has the Liberty Tree Memorial historical marker and tree. The original Liberty Tree in Boston, Massachusetts had effigies in protest of the Stamp Act. It was the rallying place for the Sons of Liberty until British soldiers cut it down in 1775. The Liberty Tree in Monument Park was planted by the Fort Lee Common Sense Society on the Bicentennial of Thomas Paine's death on June 8, 2009. The tree was planted where Thomas Paine wrote The American Crisis in 1776. Also on the corner of Parker Avenue and Angioletti Place are historical markers for Old Army Road, the original name for Palisade Road, and Thomas Paine who was a volunteer in the Continental Army and authored The American Crisis while at Fort Lee. Paine wrote The American Crisis to unite by colonies by exposing the British and to gain support of the Loyalists.