In August 1811 he became a Lieutenant colonel in the 23rd Light Dragoons but remained on Wellington’s staff until July 1812.

Lieutenant 4th Dragoons,Peninsular War, 1809-11.

Mackenzie originally joined the Royal Marines in 1178 and served in India and the West Indies. He commanded a brigade in the army under Sir Arthur Wellesley in Spain in 1808-9. He was killed at Talavera, July 28th, 1809.

Commanding 4th Company, 7th Battalion, Royal Artillery

Letter to His Excellency Charles Stuart

Letter to Sir Charles Stuart

Letter to Charles Stuart, Esq.

Serving as the Colonel of the Spanish Hibernia Regiment, in 1810 he became a Brigadier-General and in 1814 a Major-General. He became a Marshal in the Spanish in later life.

To Mr William Lewin, No.20 Victualling Office Row, Grove Lane, Deptford, England

Arrangement for the sick of the 4th Division officers in the divisional hospital at Aldea d’Obispo

William Howard, Lt Colonel commanding

He was actually attached to the Portuguese Army from 1809 to 1814