The 4th Continental Artillery Regiment, also known as Proctor's Continental Artillery Regiment, was an American military unit during the American Revolutionary War. The regiment became part of the Continental Army on 10 June 1777 as Colonel Thomas Proctor's Continental Artillery Regiment. It was made up of eight artillery companies from eastern Pennsylvania. At the time of the regiment's formation, two companies were already in existence, one from as early as October 1775. One company served at Trenton in December 1776 where it performed well in action. In February 1777, Pennsylvania expanded its two-company battalion into an eight-company regiment. After officially joining the Continental Army, the regiment saw much fighting in the Philadelphia campaign in late 1777. Elements of Proctor's