In 1810, the 1st Battalion took part in the Battle of Buçaco in which a British-Portuguese Army of about 50,000 soundly defeated a numerically superior French force before marching to the Lines of Torres Vedras, a series of trenches and redoubts designed to protect Lisbon, and where the British again defeated the French, forcing the French Army to withdraw. The following year, in March, companies of the 2nd Battalion, who were now deployed to the Peninsula, took part in the Battle of Barrosa in an attempt to lift the siege of Cadiz, and soundly defeated the French relatively quickly, and for its actions, won the regiment its sixth battle honour.