He served as assistant Adjutant General, Home District, from 1803 to 1805, was made a Colonel in the Army and ADC to the King in 1808. He took command of his regiment in the Peninsula War from 1809 to 1812 and command of a Cavalry Brigade in 1810, fighting at the Battles of Busaco (1810), Albuera and Usagre (1811).