Event dated 19.9.1944 3 x YAK-9 shot down Belgrade

[researcher111]

An other puzzle I am after is as into the fate of 3 x YAK's
of 168 GvIAP which departed on September 19,1944
from Bucharest airfield Pipera or Leordeni airfields enroute
to their new airfield at Dechempeni presumed as Oradea .

Rather arrive on their ETA's and land all 3 pilots may
have got engaged air to air over Belgrade shot down
or mistakenly landing there due to Nav error .

All 3 pilots managed to be captured unharmed, then
arrive at Stalag Luft II for Soviet airmen Litzmannstadt (Lodj)
The Soviet leader was an expert ranked major with 6
confirmed kills , pilot with VVS since 1939. At a later point
in time all 3 attempted an escape were captured by SD
in Poland, then executed by Gestapo near Frankfurt and
like in many similar cases cremated . Their remains were
never found .

1) Which Luftwaffe unit and pilots claimed over Belgrade
YAK-1, 3 or 9's or Soviet fighters in the early or late afternoon
or which Luftwaffe airfield reported the landing ?

2) Which Luftwaffe unit reported a loss over Belgrade
and what type of aircraft ?

Cheers
Alex K