 Complete the following phrase:  During the Spanish Civil War, Pingel volunteered for service with the Condor Legion, a unit composed of volunteers from the Luftwaffe and from the Army which served with the Nationalists. There, he was assigned to 2. Staffel 2nd squadron of Jagdgruppe 88 J8888th Fighter Group under the command of Oberleutt Günther Lützow. 2. Staffel was the first squadron to be fully equipped wih the then new Messerschmitt Bf 109. On 8 July, during the Battle of Brunete, Pingel led a flight three aircraft  from 2. Staffel on a fighter escort mission for bombers from Kampfgruppe 88 and reconnaissance aircraft from Aufklärungsgruppe 88. Near Aranjuez, the flight encountered five bombers heading for Ávila. In this encounter, Pingel was credited with the destruction of a Tupolev SB-2 bomber. Four days later, he was credited with the destruction of another SB-2 bomber and an escorting Polikarpov I-16 fighter. On 16 July near Fuenlabrada, Pingel shot down another I-16 fighter. Pingel was credited with his sixth and last aerial victory in Spain on 22 August during the 