There were two Sopwith Triplanes lost on the 3rd September, Le Garrec of the Escadrille Terrestre de Chasse du CAM de Dunkerque in N5388 and FSL GBG Scott of No.1 Squadron RNAS.
Le Garrec came down near Dixmude and Scott at Wytschaete.
As already posted, there were three claims for Triplanes on the 3rd:
Ltn K Hammes J32 SE of Essen
Ltn A v Schönebeck J11 East of Hollebeke
Ltn E Stapenhörst J11 at Wytschaete
Hammes at Essen is obviously ridiculous!
Schonebeck and Stapenhorst, however, seem much more likely. Hollebeke and Wytschaete are both close to Dixmude. If we assume that Scott really did come down at Wytschaete he fits Stapenhorst's claim perfectly. That leaves Schonebeck claiming Henri Le Garrec.
Jasta 11 strikes again.
So what about Hammes? Awarded a claim with no evidence to back it up and no matching loss on the Allied side

But no. how stupid of me, we all know that never happened!
One other thing, Volker said "
There is only a small chance that a German pilot misidentfied this type of aircraft during the summer of 1917."
Hey, if it was good enough for Lothar von R, surely it was good enough for anyone?
Mike