Luftflotte 4 supported the 14th Army attacking out of Slovak Republic.[9] Luftflotte 4's bombers dropped 389 tons of bombs on 1 September, 200 on Kraków in 1,200 sorties.[9] Leutnant Frank Neubert and Unteroffizier Frank Kilnger from 1 staffel are believed to have claimed the first aerial victory of the war against a PZL P.11.[4] Captain Mieczysław Medwecki, 121 Squadron, Polish Air Force, was taking off from Balice airfield.[10]