 He participated in the Raid on Richmond with Benedict Arnold in January, 1781 and was involved in a skirmish near Williamsburg and was at the Siege of Yorktown.He was invalided back to England in December of that year as a Lieutenant-Colonel, having been promoted in March 1782.Simcoe wrote a book on his experiences with the Queen's Rangers, titled "A Journal of the Operations of the Queen's Rangers from the end of the year 1777 to the conclusion of the late American War", which was published in 1787.