After service in Portugal (1762), Halifax (Nova Scotia), and Boston (1766-72), Dalrymple commanded the expedition sent to subdue the Caribs in St. Vincent, 1773.
Col. Dalrymple, having had hopes given him of a further payment to reimburse him for his expenses in the expedition against the Caribs, will in all probability desist from his claim upon obtaining the promotion he solicits.
He received nothing until the autumn of 1779, when he was appointed quartermaster general in America with the rank of brigadier-general.
In 1782 charges were brought against him concerning his accounts and profits; in his defence he quoted the comment of the commander-in-chief, Sir Henry Clinton:
Your acts have my complete approbation and ... the advantages that may have risen to yourself I am glad of. The public have been well served, and it is fit those who performed it so meritoriously should have their reward.
Dalrymple returned home in 1783, and at the 1784 election was returned after a contest, on Lord Stair’s interest. Despite Stair’s Opposition connexions, Dalrymple was listed ‘doubtful’ by William Adam in May 1784. He voted for parliamentary reform, 18 Apr. 1785, and with the Opposition on the Regency. No speech by him is recorded. He did not seek re-election in 1790.
‘A man of the most amiable manners and temper’,
