Grosvenor served in Flanders in 1793, and in Holland and the retreat from Bremen in 1794-5. In 1794 his uncle, the 1st Earl of Grosvenor, asked Pitt to appoint him a groom of the bedchamber, and Grosvenor himself later reminded the minister of the application, but nothing came of it.
Grosvenor gave general support to Addington’s ministry. He was a teller for the majority against Tierney’s attack on Dundas as a war minister, 22 Apr. 1801. Although he went to the House inclined to support the claims of the Prince of Wales to arrears of duchy of Cornwall revenues, 31 Mar. 1802, the arguments advanced ‘convinced him that he could not regularly enter upon the discussion, or venture upon the decision of the right’, but he spoke and voted for the Prince’s financial claims when they were pressed again, 4 Mar. 1803. He opposed the suppression of bull-baiting, 24 May 1802, when he raised a laugh with his observation that ‘the higher orders had their Billington, and why not allow the lower orders their bull’. He spoke against a proposed amendment to the volunteer consolidation bill, 20 Mar. 1804. Between 1802 and 1807 he held brigade commands at home.
A coolness had developed between Grosvenor’s cousin, now 2nd Earl Grosvenor, and Pitt, by the time the latter returned to power in May 1804. Lord Grosvenor was said to be ‘strongly disinclined’ to support the new ministry ‘on account of the Catholic question’, and Pitt apparently never forgave him for his letter of 14 May 1804 deploring the excessive number of peerage creations during the past 50 years. After failing to persuade Grosvenor’s elder brother Richard Erle Drax Grosvenor, his colleague at Chester since 1802, to attend Parliament to support the additional force bill, the King ‘had application made to the general, whose answer was that he wished his elder brother Drax to set him the example, as he was fearful of offending Lord Grosvenor’.
After Pitt’s death Lord Grosvenor went over to the Whigs, and General Grosvenor, unlike his brother, is not known to have opposed the ‘Talents’. On 25 Feb. 1807 he asked Lord Grenville for the vacant colonelcy of the 47th Foot and referred to ‘the high respect I entertain personally for your lordship and the wishes of my family and myself to give our aid and support to your administration’.
He commanded a brigade in the Copenhagen expedition, received the thanks of the House for his part in the affair, 28 Jan. 1808, and replied in his place, 1 Feb. He endorsed the vote of thanks for the victory at Vimeiro, 25 Jan. 1809, paying particular tribute to Wellesley’s leadership, but voted against government on the convention of Cintra, 21 Feb. At the close of the following day’s proceedings on the Duke of York inquiry he made a statement testifying to the army’s appreciation of his services as commander-in-chief. He was second in command of a division on the Walcheren expedition. He voted against government on the address, 23 Jan., and on Porchester’s motion for inquiry into the expedition, 26 Jan., when he said that ‘he was little disposed to dispute about forms’ and ‘inquiry was his sole object’. One ministerialist dubbed him a deserter ‘who ought to have voted with us’, and a Whig reported that his ‘few words’, as a spokesman for the army, ‘had most effect’ in the debate.
Grosvenor, who topped the poll at Chester at the contested election of 1812, voted for Catholic relief, 2 Mar., 13 and 24 May 1813, but did not do so in subsequent divisions in this period. He continued to divide with opposition, when present, but was clearly an indifferent attender. His only recorded votes in the 1812 Parliament were on the Spanish Liberals, 15 Feb., the army estimates, 6 Mar. 1816, the address, 29 Jan., the suspension of habeas corpus, 26 and 28 Feb. 1817, and its renewal in June, and the Speakership, 2 June 1817. He called for the exemption of officers on active service from the property tax, 1 May 1815, and paired against continuance of the tax, 18 Mar. 1816. His opponents at Chester in 1818, when he was returned with Lord Grosvenor’s son after a contest, attributed his sparse voting record to diplomatic absences ‘when his expectations from ministers have opposed his fealty to his lordly constituent’.
