Hmmmm.....
All is hard...
It seems that there just not enough information about actions of Gruppe in Poland in 1939...
Same thing as claims and losses of Erpr.Gr.210 over England... I know only 4 claims of this unit, but there MUST be more: for example Eduard Tratt added 10 claims to his score during BoB:
http://www.luftwaffe.cz/tratt.html
Thats all I could find ErprobungsGruppe 210 claims, from Tony Woods lists:
27.07.40 Ltn. Horst Marx: 1 3./ErprGr. 210 Hurricane über See vor Dover - OKL+JFV d.Dt.Lw. 4/I-1
11.08.40 Fw. Otto Rückert: 1 3./ErprGr. 210 Spitfire - - OKL+JFV d.Dt.Lw. 4/I-2
11.08.40 Oblt. Heinz Schoenfeldt: 1 3./ErprGr. 210 Spitfire - - OKL+JFV d.Dt.Lw. 4/I-3
12.08.40 Ltn. Horst Marx: 2 3./ErprGr. 210 Hurricane - - OKL+JFV d.Dt.Lw. 4/I-4
Seems I have more info about Gruppe actions during 1941 (as I./SKG 210), Battle of Kharkow in may 1942, Battle of Stalingrad in late 1942, "sitzcrieg" in early 1943, Battle of Kursk in july 1943 - then about actions in 1939 - 1940...
This is sad...