Nyorai kupfuurira kweiyi ndima - Kunyange zvazvo ZNDH yakanga ine rutivi ruduku mukurwisa kwakatevera kwechiuto, Case Black
() pakati pa1943, kubatanidzwa kwayo kukuru kwakanga kuri pamberi nechepakati peNDH. Senguva dzose, kurwisa kwevaPartizan kwakaratidzira kupukunyuka kunogumbura uye kubudirira uye zviitiko zvitsva zvakatanga kupesvedzera kurwisana muYugoslavia. Mauto eChikwata aiziva zvakanaka kutyisidzira kwekurwiswa nendege kunomutswa neZNDH's medium bomber force uye musi wa10 Nyamavhuvhu 1943 vakaita kurwiswa kwehusiku kunoparadza neboka panhandare yendege yeSarajevo Rajlovac. Kurwisa kwemaawa matatu nehafu kunhandare yendege kwakasiya mabhomba gumi eZNDH, pamwe nemamwe mabhomba mashanu eLuftwaffe uye anotakura, akaparadzwa, nedzimwe ndege gumi nenomwe dzakakanganiswa. Kunyange zvazvo vamwe vashandi vendege vakadzorera moto kubva kumapurisa-pfuti enhandare dzavo, kurasikirwa kwevaPartisan kwakanga kuri pasi pe20. Zvadaro ZNDH Command yakanyunyuta kuti maGerman akarayira kupararira kwendege dzakapoteredza nharaunda yenhandare yendege, kana paine kurwiswa nendege, zvakaita kuti ndege idzi dzikwanise kurwiswa nemhando iyi yekurwiswa pasi.