▁d ive ▁bom bers ▁and ▁ 6 0 ▁f igh ters . ▁ ▁The ▁Germ ans ▁claimed ▁nin ete en ▁Y ug oslav ▁B f ▁ 1 0 9 E ▁f igh ters ▁and ▁four ▁un ident ified ▁aircraft ▁destroyed ▁on ▁ 6 ▁April . ▁Act ual ▁Y ug oslav ▁aircraft ▁losses ▁on ▁the ▁first ▁day ▁were ▁ten ▁shot ▁down ▁and ▁fifteen ▁dam aged . ▁The ▁Y ug oslav s ▁claimed ▁to ▁have ▁shot ▁down ▁twenty - two ▁German ▁aircraft ▁and ▁forced ▁two ▁others ▁to ▁land . ▁The ▁Germ ans ▁lost ▁twelve ▁aircraft , ▁significantly ▁fewer ▁than ▁claimed ▁by ▁the ▁Y ug oslav s : ▁two ▁Do ▁ 1 7 Z ▁light ▁bom bers , ▁five ▁B f ▁ 1 1 0 ▁heavy ▁f igh ters , ▁four ▁Ju ▁ 8 7 ▁d ive ▁bom bers , ▁and ▁one ▁B f ▁ 1 0 9 E ▁f ighter . ▁One ▁Luft wa ffe ▁pilot ▁who ▁claimed ▁his ▁first ▁victory ▁over ▁Bel grade ▁on ▁ 6 ▁April ▁was ▁Ober le ut nant ▁Ger hard ▁Ko all ▁of ▁Jag d gesch w ader ▁ 5 4 . ▁He ▁went ▁on ▁to ▁be ▁cred ited ▁with ▁ 3 7 ▁vict ories ▁and ▁was ▁awarded ▁the ▁Knight ' s ▁Cross ▁of ▁the ▁Iron ▁Cross ▁in ▁ 1 9 4 4 . ▁ ▁German ▁bom bers ▁and ▁d ive - b om bers ▁dropped ▁ ▁of ▁bomb s ▁and ▁inc endi aries ▁on ▁the ▁capital . ▁The ▁weak ▁V V K J ▁and ▁in ade qu ate ▁anti