Like his father, Montgomery chose the military profession and served with distinction as a cavalry officer in the war against Tipu Sultan in India. While on furlough in July 1803, he requested permission to raise a fencible corps in his native Donegal, where he thought he had ‘a chance of being most useful’ to government, though by now a ‘stranger’ there. He applied to Lord Hobart, whom he had known in India, and was armed with a testimonial from Lord Wellesley, to whom he had been captain of the bodyguard at Calcutta. His wish was gratified.
Lord Wellesley was anxious to bring Montgomery into Parliament as one of his India squad in 1806 and with Michael Symes he unsuccessfully contested St. Ives, where his return would have cost £3,500. By a bargain with (Sir) Christopher Hawkins, Montgomery was returned instead for Mitchell, with Sir Arthur Wellesley, in January 1807 at the cost of £5,000.
When disappointed over a request for local patronage, 24 Mar. 1808, he assured Sir Arthur Wellesley:
I do not however by this mean to intimate that I have the smallest intention of changing my conduct, for as long as Lord Wellesley continues his support to the administration so will I continue to do so.
The official view of him was, ‘Supports government but not zealously, and ... will oppose when he can’. On 10 June 1808 Wellesley reported to Perceval that government had had his ‘attendance and support’ and in October he became a baronet, at Wellesley’s rather than the viceroy’s instigation.
Montgomery’s pre-ordained role in Parliament was to defend his patron’s conduct of the government of India. Creevey dubbed him ‘the ogre of the Indian squad’. An East India Company stockholder, he was not disappointed in his hope of replacing Sir Arthur Wellesley on the East Indian committee in February 1810, but was not retained on it next session. On 4 May 1810 he supported Creevey’s motion on Indian affairs, as also on 21 Feb. 1811, in both cases criticizing the Madras government and Sir George Barlow; on 4 Mar. he criticized the East India Company’s extravagance. He opposed any fresh regulation of the press in India, 21 Mar. On 10 Jan. 1812 he objected to the vote of thanks to Lord Minto in such a ‘vehement’ way as to lead Minto’s friends to suppose that Montgomery ‘must have some Indian source of enmity of his own’, since Lord Wellesley was supposed to favour the vote. He tried in vain to explain away his speech on 10 Feb. On 22 June 1813, once more a select committeeman, he ridiculed the notion of converting India to Christianity, thinking ‘the people of this country’ living in India in far greater need of moral reform. On 13 July he twice attempted, unsuccessfully, to improve the standing of the unpensioned senior military officers employed by the East India Company by moving additional clauses to the charter allowing them eligibility for the council or agency at the courts of native princes.
Next to India, Ireland was Montgomery’s favourite subject in debate. On 17 Apr. 1809 he brought in a bill to guarantee the freehold rights of Irish Catholics who had not taken the oath of allegiance, which was mauled in committee, but passed on 12 June. On 28 May 1810 he seconded Robert Shaw’s motion critical of the Irish post office. On 22 Feb. and 7 Mar. 1811, supporting the prohibition of the Catholic convention, he nevertheless pledged himself to continue his support of Catholic claims ‘so long as those claims were brought forward in a peaceable and constitutional manner’. He voted for their claims, 21 May 1810, 31 May 1811, 24 Apr. 1812, 2 Mar., 13 and 24 May 1813 and 30 May 1815. On 16 May 1811 he voted for the repeal of the advertisement tax on Irish newspapers. He supported the Irish distilleries bill, 17 June 1813. He was a critic of the Orange Lodges, 29 June 1813, and on 25 Apr. 1815 (after voting against the new taxes on 13 Mar.), he opposed the extension of the property tax to Ireland: in fact he opposed it on principle, deprecating the prospect of the renewal of war and voting against it, 28 Apr. and 1 May.
He also intervened on military affairs, supporting votes of thanks to Wellington and opposing Burdett’s motion to abolish flogging in the army, 16 June 1811. On 6 July 1814 he concurred in the general vote of thanks to the armed forces, paying particular tribute to the Duke of York and suggesting the inclusion of the East India Company forces.
When his patron left the government in February 1812, Montgomery voted selectively with opposition for the remainder of the session, as did other Wellesleyites. He naturally voted for Stuart Wortley’s motion, 21 May 1812, and had Lord Wellesley come to power he was earmarked for ‘a government’. He had canvassed Irish Members on Wellesley’s behalf and the Liverpool administration saw to it that Lord Conyngham withdrew his support from Montgomery in Donegal at the ensuing election. He gave up that seat, to be returned instead for a seat purchased by Lord Wellesley from Sir Leonard Holmes.
