Rubuta ci gaba ga wannan sakin layi - A 06:45 a ranar 6 ga Afrilu 1941, "Luftwaffe" ya kaddamar da Operation Retribution
, jerin hare-haren bam da aka shirya a kan Belgrade wanda ya yi daidai da hare-haren iska da na kasa a duk faɗin ƙasar. Yawancin raƙuman jiragen saman Jamus sun kusanci Belgrade a cikin yini, da farko Junkers Ju 87 "Stuka" masu jefa bama-bamai masu nutsewa tare da mayakan. Game da 08:00, Hurricanes na 52nd Fighter Group sun shiga karo na biyu yayin da ya tashi bayan da aka kai harin a birnin; daya daga cikin 'yan bindigar da aka harbe su ne daga matukan jirgi uku daga Squadron na 163. A ragowar ranar farko ta mamayewa, Hurricanes na VVKJ ba su ga wani aiki ba, duk da ci gaba da sintiri tsakanin Čačak, Kraljevo, da Kragujevac. Kaɗan daga cikin jirgin sama suna da rediyo, saboda haka mayaƙan sau da yawa sukan makara don su shiga yaƙi. An ba da umarnin jiragen sama guda biyu na 4th Fighter Regiment tare da rakiyar Bristol Blenheim Mk I masu fashewa da wuta don kai hari kan manufofi a Ostiryia, amma sun rasa ganin 'yan kunar bakin waken a cikin girgije. Daga nan sai daya daga cikin matukan jirgin ya yi kokarin hana wasu mayakan Messerschmitt Bf 109 na Jamus.