Hi Gunnar,
Lots of activity, that day.
I did a search in Henshaw:
The Sky Their Battlefield, and although there were significant DH4/DH9/DH9A losses that day, time and location, it would appear, narrow it down to 80 squadron, flying Sopwith Camels.
The entries are as follows:
C8382 Sopwith Camel 80 Sqn
**OP combat? FORET DE MORMAL shot up dam returned a'dr OK (Capt HA Whistler) left 10-15 am
D9635 Sopwith Camel 80 Sqn
**OP left 10-15am combat with EA shot down FORET DE MORMAL
MIA(2Lt HCR Grant
KIA)
F2139 Sopwith Camel 80 Sqn
**OP left 6-05am FORET DE MORMAL combat shot up dam OK (2Lt GA Hodgetts)
F6110 Sopwith Camel 80 Sqn
**OP left 10-15am combat? FORET DE MORMAL MIA but OK? (Lt RC Fyson)
Except for F2139, this seems to match time and location.
27Sqn (DH9) lost 5 a/cs that day near MAUBEUGE, VALENCIENNES AND SYMPHOMEN, but they took off from their airfield at 12-25PM, hence no match.
Hope this is of some help.
Best regards,
Ira