German air crews supported the Nationalist advance on Madrid and the relief of the Siege of the Alcázar. The Condor Legion's aircraft were accompanied by two armoured units. By the end of 1936, 7,000 Germans were in Spain. The Nationalists were supported by German units and equipment during the Battle of Madrid and during the Battle of Jarama of February 1937. The fighting demonstrated the inadequacy of the Legion's aircraft compared to superior Soviet-made fighters. The War in the North was supported by a constantly re-equipping Condor Legion.