German claims 27 Aug 1943

Bonjour à tous !

French Air Force Historical Office search any information about German victories over France, for 27 August 1943.
This day, Squadron Leader (Free French) René Mouchotte was missing (Squadron 341, Groupe de chasse "Alsace", Spitfire IX MH417 NL°L).
During a B-17 escort over France, 341 Sqn was attacked by Fw 190 (JG 2, JG 26 ?) :
- 1 Spitfire shot down (Sergent-chef Magrot)
- 1 Spitifre MIA (René Mouchotte)
Who can help us with German archives or books, etc.
It is an urgent request because we prepare a book (René Mouchotte, "Mes carnets") for november...
Help will be mentionned in this book !
Thank you very much (I apologize for my bad English language...)

Georges-Didier Rohrbacher
French Air Force Historical Office - Vincennes (near Paris)