Background
He was born in Rockfleet Castle, County Mayo, Ireland, the sixth son of John Arbuthnot, Senior of Rockfleet.
He was born in Rockfleet Castle, County Mayo, Ireland, the sixth son of John Arbuthnot, Senior of Rockfleet.
He entered the British Army as an ensign in the 29th Regiment of Foot in November 1795. He was promoted to lieutenant in the 40th Regiment of Foot in May 1796 and to captain in the 8th West India Regiment in June 1798. He then joined the Quarter-master General"s department and served under Sir John Moore on the Peninsula from May 1803.
Arbuthnot was promoted to major in the 5th West India Regiment in the West Indies in April 1808 before being appointed assistant ajutant-general in General Picton"s division for the greater part of the Peninsular War.
He was twice wounded, once in the West Indies and again in one of the actions in the Peninsula. Promoted to lieutenant-colonel, he became deputy quartermaster general at the Cape of Good Hope in May 1810.
He was appointed an aide-de-camp to the Prince Regent in February 1812, promoted to brevet colonel in June 1814 and appointed a Knight of the Order of the Bath in 1815. Promoted to major-general in May 1825, Arbuthnot was sent next year to Portugal in command of a brigade.
He also served as colonel of the 52nd Foot from December 1839, colonel of the 9th Regiment of Foot from December 1844 and as colonel of the 71st Highlanders from February 1848.