On May 29, 1778, the British army begins the process of evacuating Philadelphia, and relocating to New York City, by deploying two regiments across the river at Cooper’s Ferry, near Camden, to reinforce the garrison there. New Jersey militia are watching and reporting all such movements to George Washington’s command center. At this point, neither the British nor the Americans know what route General Clinton will choose in order to reach New York City. They will meet on the field of battle in four weeks at the Battle of Monmouth.
Source: Lender, Mark E., & Stone, Garry W. (2016). Fatal Sunday. University of Oklahoma Press, Norman, Okla., pp. 441-450.