The 11th Pennsylvania Regiment was assigned to the main army on 27 December 1776. Together with the 2nd, 4th, 10th, and 12th Pennsylvania Regiments, the 11th was assigned to Thomas Mifflin's brigade. Since the brigade fielded 1,500 troops, the five regiments averaged around 300 men each. Mifflin's brigade crossed the Delaware River to Burlington, New Jersey on 28 December. By 1 January 1777, Mifflin moved his troops to Bordentown, New Jersey. He joined the main army the next day in time to be present at the Battle of the Assunpink Creek. Mifflin was at George Washington's council of war that evening.