Excellent Duckbutt!
This is indeed Saint Pol/Brias ("y" not used nowadays). This place was used extensively by the JG2 and it was also where the pilots got acquainted with the 109F. There even was an unformal "Kommando saint Pol" dedicated to this task. Within the "chateau de Brias" grounds just at the north end of the place (I removed it from the photo) are the remnants of the JaFü 4 "Pluto" which was the fighter command post for all north of France and Belgium in 1943/1944.
How did you find out DB? In any case the floor is yours!
JV