Garth was the son of
John Garth (1701–1764), Recorder and MP for Devizes, and Rebecca, daughter of John Brompton and granddaughter of Sir
Richard Raynsford, Lord Chief Justice of the King's Bench. He entered the army as a
cornet in the
1st Dragoons in 1762. He saw action in Germany in 1762 during the
Seven Years' War. General Garth died on 18 November 1829. He left his house, 32
Grosvenor Place, Mayfair, to Tommy Garth. He named his residuary legatee as his nephew,
Captain Thomas Garth RN (1781–1841) of Haines Hill, Berkshire, the son of General Garth's older brother,
Charles (1734–1784) who was an MP and Government Agent for
South Carolina,
Georgia and
Maryland. Another brother,
George Garth (abt 1733–1819) was a British General in
American Revolutionary War, and Colonel of the
17th Regiment of Foot. ==References==