The brigade mustered at Albacete in Spain, in January 1937, comprising mainly English-speaking volunteers – arranged into the mostly British Saklatvala Battalion and the mostly North American Lincoln Battalion. It also included two non-English-speaking battalions, the Balkan Dimitrov Battalion and the Franco-Belgian Sixth February Battalion. It fought at Jarama, Brunete, Boadilla, Belchite, Fuentes de Ebro, Teruel and the Ebro River.