[1] He was born the son of Captain John Montresor; Henry's brothers were also officers in the Army.
Promoted Brigadier General he was posted to the West Indies from 1805 to 1808, where he was captured by a French ship en route to Jamaica and released on parole on condition that he did not continue to serve.
He was in Sicily 1812–1814, commanded a division in Italy at Genoa in 1814, and was in Corsica in 1814.
[2] He was honoured with a knighthood in 1818 and was appointed KCB in 1820 and GCH in 1817.
He was made colonel of the 11th (North Devonshire) Regiment from 1823 to his death in 1837.