Nyorai kupfuurira kweiyi ndima - Pana 06:45 pana 6 April 1941, "Luftwaffe" yakatanga Operation Retribution
, nhevedzano yekurwisa mabhomba kwakabatana paBelgrade kwakaenderana nekurwisa kwemhepo nepasi munyika yose. Mafungu anoverengeka engarava dzeGermany akasvika kuBelgrade mukati mezuva, pakutanga Junkers Ju 87 "Stuka" vanobhomba vanobhururuka vachiperekedzwa nevarwi. Around 08:00, Hurricanes of the 52nd Fighter Group engaged the second wave as it departed after bombing the city; imwe yemabhomba-bhomba yakapfurwa nevarwi vatatu kubva ku163rd Squadron. Nokuda kwasara kwezuva rokutanga rokupinda munyika, Hurricane dzeVVKJ dzakaona zvishoma, pasinei nekugara dzichifamba pakati peČačak, Kraljevo, neKragujevac. Ndege shomanene dzakanga dzine maredhiyo, naizvozvo varwi vaiwanzosvika kunonoka zvikuru kuti vatore rutivi mukurwisana. Michina miviri ye4th Fighter Regiment yakapiwa basa rokuperekedza mabhomba akareruka eBristol Blenheim Mk I kuti arwise zvinangwa muAustria, asi vakarasikirwa nokuona mabhomba mumakore akafukidza. Mumwe wevatyairi wendege akabva aedza kubata dzimwe ndege dzehondo dzeGermany dzeMesserschmitt Bf 109.