TAZ is right!
As well I really advice to read/translate Mr Kastners article (Feindliches Geschwader im Anflug) in "Das Propellerblatt"! Don't know if this early issue of the magazine is still available but you should look at the homepage of the magazine.
The article provides stuff for at least another painting too, e.g if the crew Merz/von Lichtenberger was encircelled and fired at by 8 French airplanes.
http://www.propellerblatt.de/
VBR
Rammjaeger