Hi Franck,
GC III/3 took off at 12h55 (French time).
Yes a/c of I./JG 27 were straffed by these Dewoitine but page 27 in the fabulous book "Du Fw 190 au NC 900" by René BOUVIER-BELLEVILLE & Philippe COUDERCHON we have a photo of 109 from 2./JG 1 taken at Auxerre.
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I would like to know if these 109 of I./JG 1 were already here when GC III/3 straffed...
Nevertheless up to today we can thought that he D520 strafing had nothing to do with the losses of Dornier 17 and 109s of I./JG 27. But if you read this book the circunstances revealed that the Do 17 landed during the time of the attack...
Bertrand