On this episode of Fight the Empire Per reflects on the San Patricio Battalion, the mostly Irish soldiers who switched sides in our war against Mexico. They were led by an artillery man named John Riley and fought several big battles against the Yankee invaders. Mexico lost the war, however, and many of the San Patricios were executed. Since Riley and some others had switched sides before war was declared, they were lashed and branded with the letter D for deserter. The San Patricios are honored in Mexico and in Clifden, the Irish town were Riley was born.