Major Cooper was a member of the Continental Army and an original member of the Society of the Cincinnati.
The Major was one of the participants of the "Boston Tea Party".
In 1773, Samuel was appointed a 2nd Lieutenant of the 3rd Regiment, Continental Corps of Artillery; 2nd Lieutenant and Regimental Quartermaster on 14 May, 1778, and then to Regimental Adjutant on 11 June, 1783.
He was transferred to the Corps of Artillery on 17 June, 1783 and served as Adjutant of the same until honorably discharged on 1 January, 1784.
Moving to Georgetown, D.C., he resided there until his death on 19 August, 1840. Buried in christ Church Cemetery, Alexandria, Virginia, his tombstone was inscribed as follows:
Sacred to the Memory of Major Samuel Cooper of the Revolutionary Army, who in early youth at the first outset Struck for Liberty and continued to wield the sword in the defense of his Country until victory crowned her arms. He fought at Bunker Hill, Trenton, Brandywine, at Germantown and Monmouth, and other sanguinary fields. As then a valiant soldier, so in after life was he an active and estimable citizen. He was born in the State of Massachusetts. He died in the State of Virginia on the 19th of August, A.D.1840, at the age of 84
Major Samuel Cooper's wife, Mary Horton, was the daughter of Jacob and Jane Van Voorhies Horton of Duchess County, New York. Their wedding took place at "Mooda", later called "Murderers Creek", below Newburg, New York. The bride, Mary Horton, was given away at the ceremony by General the Marquis de Lafayette.
Major Cooper is the Father of General Samuel Cooper.
Major Samuel Cooper and Mary Horton had the following children:
+ 12 v. Jane Cooper Heaton was born May 15, 1783.
+ 14 vii. George Cooper was born 1795 1795.
+ 15 viii. Adjutant and Inspector General Samuel Cooper, CSA was born June 12, 1798.
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