WILLIAMSON, SIR ADAM, only son of Lieut. -Gen. George Williamson, Royal Artillery, and Jane, dau. of Capt. Robert Pedley; b.; adm. (aged 10) Oct 1744 (Hawkins'); Cadet Gunnner, Royal Artillery 1 Jan 1748; RMA Woolwich 1750; Practitioner Engineer 1 Jan 1753; Ensign, 6th Foot 14 Oct 1755; Lieut., 5th Foot 25 Sep 1757; Engineer Extraordinary and Capt. -Lieut., 4 Jan 1758; Capt., 40th Foot 21 Apr 1760; Maj., 61st Foot 16 Aug 1770; Engineer in Ordinary and Capt., 4 Dec 1770; Lieut. -Col. in Army 12 Sep 1775; 18th Foot 9 Dec 1775; Col., 15 Feb 1782; Major-Gen., 28 Apr 1790; Col., 47th Foot 16 Jul 1790 – Mar 1794, 72nd Foot (Highlanders) from 19 Mar 1794; Lieut. -Gen., 26 Jan 1797; nominated KB 18 Nov 1794, invested 21 Apr 1795; served in Braddock’s expedition to Virginia 1755, wounded at battle of Du Quesne; took part in Canadian campaign during Seven Years’ War, being wounded at Montmorency during siege of Quebec Aug 1759; accompanied expedition to West Indies 1761-3; present at battle of Bunkers Hill Jun 1775; Deputy Adjutant-Gen., Forces in South Britain 23 Dec 1778; Lieut. -Governor and Commander-in-Chief, Jamaica 1790- Oct 1794; established British protectorate at St. Domingo Sep 1793; appointed Governor of St. Domingo 24 Oct 1794, but owing to losses caused by yellow fever and desultory fighting was compelled to evacuate the island; returned to England 1798; m. 10 Aug 1771 (IGI) Anne, dau. of Thomas Jones, Comptroller of Artillery, Woolwich; d. from effects of a fall 21 Oct 1798. DNB.