When the American Revolution began in April 1775 Paterson was commissioned as a colonel by the Massachusetts Committee of Safety, and he marched with his militia unit to take part in the Siege of Boston. Paterson's command, the 1st Massachusetts Regiment saw action at the Battle of Bunker Hill. After the British evacuation of Boston, Paterson's regiment took part in the Invasion of Canada and the battles of Trenton and Princeton in New Jersey. On February 21, 1777 Paterson was promoted to brigadier general in the Continental Army. During the Saratoga Campaign of 1777 Paterson commanded a brigade of Horatio Gates' army, consisting of the 10th, 11th, 12th, and 14th Massachusetts Regiments, and the 1st Berkshire County Militia Regiment. Paterson served under George Washington at the Battle of Monmouth in 1778. He served primarily in the Hudson Valley of New York until the end of the war. In September 1783, he received promotion to major general, and he was discharged in December 1783. Paterson was one of the last generals to leave active duty at the end of the war. While Paterson served in New York in 1782 and 1783, his personal staff included Private Robert Shirtliff of the 4th Massachusetts Regiment, who served as a waiter. Shirtliff was later revealed to be Deborah Sampson, a woman who had disguised herself as a man in order to join the Continental Army. Rather than reprimand her, as had often been the case with women discovered in the ranks, Paterson provided her with a certificate of honorable discharge, a note with words of encouragement, and money sufficient to pay for travel to her home in Massachusetts. In January 1783, Paterson took part in the organizational meeting that created the Society of the Cincinnati, and he was one the society's charter members.
Return to Massachusetts
After the war Paterson returned to Massachusetts, where he resumed practicing law, and also served in local offices including town meetingmoderator, selectman, fence viewer, tax assessor, and highway surveyor. In addition, he was the leader of the successful movement to locate the Berkshire County seat in Lenox. In 1785, he was again elected to represent Lenox in the state House of Representatives. In 1786, he was commissioned as a major general in the Massachusetts Militia, and assigned to command the militia's 9th Division. In 1786 and 1787, Paterson commanded militia units that took part in the quelling of Shays's Rebellion.
Move to New York
In 1790, Paterson was one of the investors in the Boston Patent, a large land grant in Broome and Tioga Counties, New York. In 1791, he moved to Lisle, a newly-organized town in Tioga County. He was a member of the New York State Assembly in 1793. The area of Lisle where Paterson settled was later organized as the town of Triangle; the site of his home and farm was in what is now the village of Whitney Point. In 1798, Paterson was appointed judge of the Tioga County Court, and he served until 1806. When Broome County was organized separately from Tioga in 1806, Paterson was appointed judge of the new county's court. In the late 1700s and early 1800s, Deborah Sampson published a memoir and made a lecture tour in which she gave presentations about her military service. Her tour took her to New York, and from November to December 1802, she visited Paterson in Lisle. While she stayed with Paterson, Sampson was able to take part in reunions with other former Massachusetts soldiers who had settled in the area of the Boston Patent. In 1802, Paterson was a successful Democratic-Republican candidate for the United States House of Representatives. He served in the 8th United States Congress, and was not a candidate for reelection in 1804.
Death and burial
Paterson died in Lisle on July 19, 1808. He was originally interred at Riverside Cemetery in Whitney Point. In 1892 he was reburied at Church on the Hill Cemetery in Lenox, Massachusetts.
Family
In 1766, Paterson married Elizabeth Lee. They were the parents of seven children, including:
Josiah Lee, who married Clarissa Hyde
Hannah, the wife of Azariah Egleston
Polly
Ruth, the wife of Ira Seymour
Betsey
John Pierce, who married Sally Osborn
Mariah, the wife of Samuel Kilborn
Congressman Thomas J. Paterson and State Senator John E. Paterson were Paterson's grandsons. Scientist and academic Thomas Egleston was his great-grandson.