Stewart, ‘a soldier of the first order’,
In his absence he had been returned for Wigtownshire on the family interest, by an arrangement made seven years before: he was the only member of the family of age to sit. There is no evidence of parliamentary activity. In 1799, apparently through Henry Dundas’s intercession with the Duke of York, with whom Stewart and his father were at loggerheads, he obtained leave to serve with the allies and did ‘wonderfully well’ at the battle of Zurich, securing the retreat of William Wickham, who thought him ‘an active intelligent officer’.
In 1802, when his father and he in turn fell foul of Henry Dundas, Stewart lost his county seat to Andrew McDouall, but in 1803 a vacancy was made for him in the burghs seat, where the family interest was secure. When in May 1804 Galloway handed over his electoral interest to his heir, Stewart wrote to Pitt to assure him that he and his younger brother Montgomery would be happy to acquiesce in whatever arrangements Garlies might make with the minister. Garlies’s acceptance of office caused the brothers to be listed among Pitt’s friends in September 1804 and July 1805, in which month Stewart resigned his seat as part of an arrangement to enable Garlies to come into Parliament. In March 1805 he had three times spoken in debate: on 5 Mar. in favour of limiting corporal punishment imposed by courts martial; a week later as to the composition of courts martial; while on 6 Mar. he supported Pitt’s additional force bill, till ‘an entire new plan’ for the army was produced. He was officer to a brigade of volunteers in the eastern counties in 1804 and his experiences inspired his Outlines of a plan for the general reform of the British land forces. This he first submitted to Pitt in January 1805.
In the autumn of 1806 Stewart was posted to Calabria, though he was willing to serve ‘anywhere’. He had made known to Lord Grenville in June his intention of standing for the county again, and being, as his eldest brother put it, ‘attached to Mr Windham’, obtained the prime minister’s good wishes; but his father’s unpopularity told against him and in his absence his candidature was withdrawn. Nor would his brother Lord Galloway hear of his candidature in 1807.
Having received six wounds and four contusions during 17 campaigns, Stewart saw no further service. In 1816 after voting for the army estimates, 6, 8 Mar., for the property tax, 18 Mar., and for the civil list, 6 May, he resigned his seat for health reasons; though, according to his erstwhile opponent Hunter Blair, he informed none of his friends, not even Lord Galloway his brother, that he intended to do so and Hunter Blair wondered whether a political difference with Galloway lay behind it. In 1817 he purchased and retired to Cumloden, where he died 7 Jan. 1827. ‘Auld Grog Willie’, as he was affectionately known to his men, kept journals of his military campaigns, some of which were published, together with his military correspondence, in 1871.
