The Challenge: Rivals III is in opposition to The Challenge.
Sholto Charles Douglas , 15th Earl of Morton -LRB- c. 1732 -- 25 September 1774 -RRB- was the son of James Douglas , 14th Earl of Morton .. He was Colonel of a regiment of light dragoons , the 17th Regiment of Light Dragoons , raised in Scotland in 1759 and disbanded in 1763 .. 17th Regiment of Light Dragoons. 17th Regiment of Light Dragoons ( 1759 ). In February 1754 he was elected a Fellow of the Royal Society. Fellow of the Royal Society. Fellow of the Royal Society. On 19 November 1758 , he married Katherine Hamilton and they had two sons  :. George Douglas , 16th Earl of Morton -LRB- 1761 -- 1827 -RRB-. Lt. Hon. Hamilton Douglas Halyburton -LRB- 10 October 1763 -- 31 December 1783 -RRB- , who died of exposure while commanding the barge of HMS Assistance .. Hamilton Douglas Halyburton. Hamilton Douglas Halyburton. exposure. Exposure ( environmental hazard ). His party was caught in a snowstorm while looking for deserters and wrecked on Sandy Hook .. Sandy Hook. Sandy Hook, New Jersey