In July 1808 the regiment embarked for Portugal, as part of Sir Arthur Wellesley's army, for service in the Peninsular War. It fought at the Battle of Roliça in August 1808, the Battle of Vimeiro later that month and the Battle of Talavera in July 1809. The regiment also took part in the Battle of Bussaco in September 1810 and then fell back to the Lines of Torres Vedras in October 1810. The regiment later took part in the Siege of Ciudad Rodrigo in January 1812, the Siege of Badajoz in March 1812 and the Battle of Salamanca in July 1812 as well as the Battle of Vitoria in June 1813. It then pursued the French Army into France and fought at the Battle of the Pyrenees in July 1813, the Battle of Nivelle in November 1813 and the Battle of Orthez in February 1814 before also taking part Battle of Toulouse in April 1814. The regiment returned home in June 1814. In October 1814 the regiment was sent to New Orleans for service in the War of 1812 but recalled upon the ending of that conflict in March 1815.