Darling married in 1817. Between February 1819 and February 1824, General Darling commanded the British troops on Mauritius, before serving as acting governor of the colony for the last three years of his stay. In this role, Darling again exhibited his administrative ability, but he also became very unpopular in Mauritius: he was accused of allowing a British frigate to breach quarantine and start an epidemic of cholera, and he then suspended the island's "Conseil de Commune" when it protested his actions; in reality, however, there was no evidence that the frigate had been carrying cholera, and the opposition to General Darling appears to have been motivated in large part by his vigorous actions against the slave trade, and the fact that British rule in Mauritius was still little more than military occupation of a proud French colony. Notwithstanding the criticism from some quarters, it was largely on account of his service in Mauritius that Darling was appointed the seventh Governor of New South Wales in 1824.