During the Balkan-campaign, Hans-Ekkehard Bob shot down two Yugoslavian Bf 109 D-types...
According to recorded data and sources, Yugoslav Bf -109E pilots hit:
7 German Bf-109E
2 Bf-110
4 Ju-87
1 Ju-88
1 He-111
2 Do-17
2 Hs -126
as well as an Italian Cant Z -1007 bis
Most probably another 4 enemy aircraft were hit their type was not confirmed, though... Another 14 were severely damaged, the consequences being the fall, breaking or even destruction of the aircraft. Among those were 3 Bf-109, 2 Bf-110, 3 Ju-87, 1 Ju-88, 1 Do-17 and 1 He -111....