In 1763, by royal proclamation, the brothers were each awarded 5,000 acres (20 km²) of land in the colonies for their military service. They attempted to establish their claims in what was then a disputed part of the New Hampshire Grants, now Vermont. However, in 1770 they decided to locate on the east bank of the Unadilla River in New York State just west of George Croghan's Otsego patent, in what is now the Town of Edmeston in Otsego County. They established their homes on the land, which became known as the Mount Edmeston Tracts. The transactions were facilitated by Percifer Carr, who had been a sergeant in the 48th with Edmeston and when the Edmeston brothers later returned to England, Carr would be employed as caretaker of their land.
When the American War of Independence broke out in 1775 Edmonston was arrested by the Americans and sent to Boston to be exchanged, after which he became Lieutenant-Colonel of the 48th Foot. He was captured by a French privateer in 1779, but he made his way to England the following year and spent the remainder of the war serving in Europe as a lieutenant-colonel, first with the 48th Foot but from 1782 to 1783 with the 50th Foot.
He died the following year and was buried at Hanwell, Middlesex on 3 July 1804.
- "To George Washington from Major General Philip Schuyler, 30 September 1776". Founders Online. Retrieved 25 July 2016.
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