6 : 4 5 , ▁and ▁consisted ▁of ▁ 7 4 ▁J unk ers ▁Ju ▁ 8 7 ▁Stu ka ▁d ive ▁bom bers , ▁and ▁ 1 6 0 ▁He inkel ▁He ▁ 1 1 1 ▁medium ▁bom bers ▁and ▁D orn ier ▁Do ▁ 1 7 ▁light ▁bom bers ▁at ▁. ▁They ▁were ▁esc orted ▁by ▁Mess ersch mitt ▁B f ▁ 1 1 0 ▁heavy ▁f igh ters ▁at ▁ ▁and ▁ 1 0 0 ▁Mess ersch mitt ▁B f ▁ 1 0 9 E ▁f igh ters ▁at ▁. ▁The ▁entire ▁Y ug oslav ▁ 6 th ▁F ighter ▁Brigade , ▁consisting ▁of ▁the ▁ 5 1 st ▁F ighter ▁Group ▁at ▁Z em un ▁and ▁the ▁ 3 2 nd ▁F ighter ▁Group ▁at ▁Pr n jav or , ▁tot alling ▁ 2 9 ▁Mess ersch mitt ▁B f ▁ 1 0 9 Es ▁and ▁five ▁Rog o ž ar ski ▁I K - 3 s , ▁were ▁sc ram bled ▁to ▁intercept ▁the ▁Germ ans . ▁The ▁Y ug oslav s ▁were ▁quickly ▁engaged ▁by ▁esc ort ing ▁Mess ersch mitt ▁B f ▁ 1 0 9 Es ▁from ▁Jag d gesch w ader ▁ 7 7 ▁( J G ▁ 7 7 ). ▁Just ▁as ▁the ▁first ▁wave ▁was ▁depart ing , ▁Haw ker ▁H urr icane ▁M k 1 s ▁of ▁the ▁ 5 2 nd ▁F ighter ▁Group ▁of ▁the ▁ 2 nd ▁F ighter ▁Regiment ▁based ▁at ▁K ni ć ▁arrived ▁over ▁Bel