 Promoted to captain on 13 October 1807, Parker was given command of the third-rate HMS "Monmouth" in the Downs in March 1811 and the fifth-rate HMS "Tenedos" on the North American Station in April 1812.He commanded the naval forces at the siege of Machias in September 1814 and took the surrender of the frigate USS "President" in January 1815 during the War of 1812.Parker took command of the fifth-rate HMS "Iphigenia" also on the North American Station in March 1818 and then the first-rate HMS "St Vincent", flagship of the Commander-in-Chief, Portsmouth, in May 1830.