Left without a ship after the peace in 1763, Elliot did not return to active service until 1767, when he was given command of the 60-gun , one of the
Plymouth guardships. He also briefly became
Member of Parliament for
Cockermouth that year. He was promoted to
commodore on 11 April 1778, and shortly afterwards took the
Earl of Carlisle,
George Johnstone and
William Eden to North America to negotiate with the colonists as the
Carlisle Peace Commission. It was about this time that he was made a Colonel of
Marines, a post he held until 1787. Elliot soon found that there was little assistance that he could render, and having a ship as large as
Edgar on station there made her a target for Spanish gunboats. Elliot consequently returned to England. Elliot spent most of the remaining years of the war commanding
Edgar in the
English Channel. In November 1781, the
Admiralty had received intelligence that a large convoy was preparing to sail from Brest under Admiral
de Guichen. It was a convoy of transports carrying naval supplies for the
West Indies and the French fleet in the
East Indies.
Edgar was part of Admiral
Richard Kempenfelt's squadron of 18 ships, commanded from , which was ordered to intercept the convoy. Kempenfelt did so in the afternoon of 12 December in the
Bay of Biscay, approximately south-west of
Ushant. With the French naval escort to
leeward of the convoy, Kempenfelt attacked immediately, capturing 15 of the transports before nightfall. The rest of the convoy scattered, most returning to [Brest; only five transports reached the West Indies. During the engagement, known as the
Battle of Ushant,
Edgar fought a running battle with the 84-gun
Triomphant. Elliot was later praised by Kempenfelt for his actions during the battle. Elliot was moved into in June 1782, and there were plans to send him to the West Indies in command of a squadron of five
ships of the line and a
frigate, but the end of the war prevented this. ==Later years==