Robert Hanson Harrison (1745 – April 2, 1790) was an American Army officer, attorney, and judge. He was a Continental Army veteran of the American Revolution and is most notable for his service as George Washington's military secretary, the de facto chief of staff of Washington's headquarters for most of the war. Early life Born in Charles County, Maryland, Robert Hanson Harrison was the son of Dorothy (Hanson) Harrison and Colonel Richard Harrison, who served in offices including justice of the peace and member of the Maryland House of Delegates. Little is known of the younger Harrison's early life and education, but he settled in Fairfax County in 1765 and was admitted to the bar. Early career By 1768, Harrison had a steady practice; after meeting Washington, Harrison represented him on several legal matters . In the years prior to the American Revolution, Harrison became identified with the Patriot cause in Virginia; he supported the Virginia Nonimportation Resolves in 1770, and served as the clerk for the Fairfax Resolves in 1774. Harrison was also a member of Alexandria's Committee of Correspondence. Additionally, he joined the militia and served as an officer in the Fairfax Independent Company in 1774 and 1775. In September 1775, Harrison was commissioned as a major in the Fairfax County Militia. American Revolution On November 6, 1775, Robert Hanson Harrison was appointed an aide-de-camp to General Washington. The following May, Harrison was appointed military secretary to General Washington in lieu of Joseph Reed. The Continental Congress approved his commission as a lieutenant colonel on June 5, 1776. In this capacity, he assisted with the drafting, writing and organization of the Commander-in-Chief's voluminous correspondence for almost five years. Moreover, President James Monroe testified that "in all the actions in which General Washington commanded, Colonel Harrison was present, near the person of the General." Along with Alexander Hamilton, Robert Hanson Harrison negotiated for the exchange of prisoners of war. The death of his father, Richard Harrison, in 1780 began a chain of events that led to Robert Hanson Harrison's resignation from the Continental Army in the spring of 1781. George Washington attested that Robert Hanson Harrison discharged his duty "with conspicuous abilities – That his whole conduct during all the interesting periods of the war has been distinguished marked by the strictest integrity and the most attentive & faithful services while by personal bravery he has marked his conduct