Some time after the outbreak of war with France, Drogheda, then a lieutenant-colonel, undertook, at considerable expense to himself, to raise a regiment of light dragoons. When this did not lead to immediate promotion, various influential friends pressed Pitt to make him a colonel. George Stone, the archbishop of Armagh, praised him for ‘persevering application in business, sound good sense, and excellent temper, and the firmest personal intrepidity’, and added: ‘alliances and friendships connect him very closely with those who are at present both willing and able to support the service of the Government, and the effects of his being disgusted would not be unperceived.’ But Drogheda had seen no active service (and in fact never did), and Pitt refused to promote him over the heads of veteran officers.
In 1764 he was appointed chief secretary to the lord lieutenant of Ireland—a surprising appointment for an Irish peer, since a principal duty of the chief secretary was to lead the Government party in the Irish House of Commons. ‘My friend Hamilton’, writes Lord Charlemont, ‘was, through the intrigues of the primate, removed from that office, and strangely replaced by my cousin Lord Drogheda.’
Drogheda was a heavy gambler. In 1763 he was reported to have broken the bank at Spa;
In October 1776 he was returned at Horsham, where Lord Irwin had placed both seats at the disposal of Government. No votes of his are reported 1776-9, and he seems to have been abroad most of that time. He wrote to the lord lieutenant, Lord Buckinghamshire, 3 Nov. 1778, that two winters abroad had not been enough to re-establish his health, and he now wished for a further extension of leave from his post in the Irish Ordnance.
Horace Walpole wrote to Lady Upper Ossory, 12 Nov. 1784, that Drogheda was ‘ruining his health through drink and play’; and according to Thomas Raikes’s diary (1858 ed. ii. 10) he was during the latter years of his life ‘subjected to great pecuniary embarrassments’. He died 22 Dec. 1822.
