Ross, after a short period of service during the ’45 with the Master of Ross’s Independent Company, obtained a regular commission in the 37th Foot with which he served at Laeffelt in 1747, and during the seven years’ war in Germany. Active in raising and training Sutherland’s Highland Battalion (the 106th Foot), he returned at the peace to the 32nd as eldest captain. When the regiment was ordered to America, James Stuart Mackenzie, a close friend of Ross’s elder brother David (later Lord Ankerville S.C.J.), applied in July 1764 for leave for Ross to stay at home ‘till he could find a purchase of a lieutenant-colonelcy’.
He stood for Elgin Burghs in 1771 against Thomas Lockhart but withdrew. Having secured the lieutenant-colonelcy of the 39th Ft. in 1773 he went to Gibraltar, but within a few years was ‘on a disagreeable footing’ with his colonel, Robert Boyd, lieutenant governor of the garrison. ‘To avoid any further interference with him’ he obtained in May 1779 three months’ leave to visit Spain, where on the Spanish declaration of war he was made prisoner. Eventually allowed to go to Portugal, he returned by rowing boat to Gibraltar.
In 1780 he was returned for Tain Burghs with the support of his brother and Stuart Mackenzie. Appointed colonel of the newly raised Manchester Volunteers he served with his regiment at Gibraltar,
He voted against Shelburne’s peace preliminaries on 18 Feb. 1783 but none the less was listed by Robinson in March as connected with Shelburne. On 13 Mar. he made a long speech on army organization, methods of raising regiments, and injustices to old officers, attacked the brevet system and called for an inquiry. Conway, the commander-in-chief, regarded it as an attack upon himself, but after considerable altercation the matter dropped. In the army estimates debate of 16 June 1783 he castigated as ‘pound foolish, farthing wise’ any such drastic reduction as that of 1763 and insisted that his regiment should be brought home in triumph to Manchester and there disbanded. After two attempts on 20 and 24 June to raise the question of half-pay (during which he was shouted down and ruled out of order) he made a long speech on the subject on 27 June, when ‘the House was so disorderly’ that he could not be heard. On 3 July he moved a motion intended as an attack upon Conway for partiality in distributing commissions, but before the division the House was counted out.
He voted for Fox’s East India bill and remained loyal to the Coalition. A long-winded, dreary speaker with a low hoarse voice, who invariably bored or exasperated the House, he caused a sensation on 12 Jan. 1784 by his report of a conversation with a lord of the bedchamber [Galloway] who had told him ‘his name was down in the list of Members who always voted with Mr. Fox’. To this Ross had replied:
He had given no authority to have his name put upon any such muster roll; but he acknowledged he had generally voted in that manner and while he entertained the same good opinion of Mr. Fox and his friends ... would continue to vote with them. Upon this the noble Lord informed him that if he voted against the new Administration on the 12th of January ... he would be considered as an enemy to the King. The General declared his feelings were shocked ... as he would not suffer any man to control his vote.
This ‘proof of secret influence’ occasioned violent debates during which ministerial supporters produced accusations of attempted bribery by the Opposition. Keith Stewart, defending his brother Lord Galloway, challenged Ross’s interpretation of their interview, but eventually both sides dropped their charges.
Henry Dundas believed that in a new Parliament Ross would lose his seat and that there was ‘a chance of getting in a friend’.
Ross did not attempt to re-enter Parliament and died 5 Mar. 1797.
