deserter, and threatened with military punishments appropriate to that charge. Even though he and Lee did not get on well, Washington threatened to treat captured British officers in the same manner Lee and other high-profile prisoners were treated. This resulted in an improvement in Lee's captivity, and he was eventually exchanged for Richard Prescott in 1778. Despite the loss of troops due to desertion and expiring enlistments, Washington was heartened by a rise in militia enlistments in New Jersey and Pennsylvania. These militia companies were active in circumscribing the furthest outposts of the British, limiting their ability to scout and forage. Although Washington did not coordinate this resistance, he took advantage of it to organize an attack on an outpost of Hessians in Trenton. On the night of December 25–26, 1776, Washington led his forces across the Delaware River and surprised the Hessian garrison the following morning, capturing 1,000 men. This action significantly boosted the army's morale, but it also brought Cornwallis out of New York. He reassembled an army of more than 6,000 men, and marched most of them against a position Washington had taken south of Trenton. Leaving a garrison of 1,200 at Princeton, Cornwallis then attacked Washington's position on January 2, 1777, and was three times repulsed before darkness set in. During the night Washington evacuated the position, masking his army's movements by instructing the camp guards to maintain the appearance of a much larger force. Washington then circled around Cornwallis's position with the intention of attacking the Princeton garrison. On January 3, Hugh Mercer, leading the American advance guard, encountered British soldiers from Princeton under the command of Charles Mawhood. The British troops engaged Mercer and in the ensuing battle, Mercer was mortally wounded. Washington sent reinforcements under General John Cadwalader, which were successful in driving Mawhood and the British from Princeton, with many of them fleeing to Cornwallis in Trenton. The British lost more than one quarter of their force in the battle, and American morale rose with the victory. These unexpected victories drove the British back to the New York City area, and gave a dramatic boost to Revolutionary morale. During the winter, Washington, based in winter quarters at Morristown, loosely coordinated a low-level militia war against British positions in New Jersey, combining the actions of New Jersey and Pennsylvania militia companies with careful use of Continental Army resources to harry and harass the