Since it was committed to the Madrid Front, the 3rd Mixed Brigade did not take part in the Battle of Jarama, but it fought at the Battle of Guadalajara in the Pico del Cuervo sector in May 1937 and in June 1937 it was dispatched to La Granja, the scenario of one of the battles of the Segovia Offensive. Prior to being sent the brigade was concentrated at Fuencarral and Militia Major Antonio Pérez Quijano became the new commander, replacing Captain Zulueta. The brigade took part in this battle in support of the 69th Mixed Brigade in its effort to capture the Alto del León on 30 Mayo and the Cabeza Grande Hill on 2 June. Finally, on 4 June the 3rd Mixed Brigade was withdrawn to Fuencarral.