 The 1st Battalion returned to the Peninsula in September 1812 and saw action at the Battle of Vitoria in June 1813 and the Battle of Sorauren in July 1813.It then pursued the French Army into France and fought at the Battle of the Nive in November 1813, the Battle of Nivelle in December 1813 and the Battle of Orthez in February 1814 as well as the Battle of Toulouse in April 1814.The 1st Battalion embarked for Ostend in April 1815 and, under the command of Lieutenant Colonel William Douglas, undertook the important task of covering the road to Brussels while the Battle of Waterloo was taking place in June 1815.