 The brigade left Falmouth in November 1806 in great secrecy, eventually reaching South America in the following year where they made an assault on Buenos Aires.The 1st Battalion returned to Ireland in December 1807.In August 1808 the 1st Battalion landed in Portugal, and was quickly engaged in action against the French at the Battle of Roliça on 17 August, the Battle of Vimeiro on 21 August.