 Complete the following phrase:  In 1787 he was accepted into the Irish Brigade of the Spanish army, and joined the army fighting in Ceuta in northern Africa, under Lieutet Colonel Luis Urbina, and was promoted to Second Lieutet. In 1791 Mackenna resumed his studies in Barcelona and acted as liaison with mercenaries recruited in Europe. The following year he was promoted to Lieutet in the Royal Regiment of Engineers. In the 