Tom
An alternative 17 May 1918 "dogfight chronology":
Capt L H Rochford, 2nd Lt C F Brown, Lt R Stone and Lt E R Prideaux shoot down a Pfalz in flames between Merville and Estaires at 11:15;
Capt L H Rochford claims another Pfalz "destroyed" north of Estaires - Beaupre at about the same time;
Prideaux is shot down in Camel B6408 at 11:15 by Oblt
Harald Auffarth, Jasta 29, his 14th victory;
Capt H F Beamish, 1st Lt W Goodnow, Lt W H Skinner, Lt R Sykes and Lt J D Breakey claim an Albatros scout that crashed south of Merville at 11:20;
Mannock knocks down a Pfalz that crashed in flames south of Bailleul at 11:20;
Uffz
Karl Pech, Jasta 29, claims an SE5 at 11:20 over Morbecque (some 17 Km west-south-west of Bailleul) - some have said that this was Lt L M Nixon of No 74 Sqn, but he was shot down in flames over La Gorgue at 09:45; this was his 7th victory;
Ltn d R
Johannes Werner, Jasta 14, claims an SE5 at Floris at 11:30, his 5th victory;
Saint-Floris is only 2 Km east of Saint-Venant and Morbecque is 8 Km north of Saint-Floris and Saint-Venant;
Pech's victim could quite conceivably have been Stone who went down near Saint-Venant (even at this stage of the war, German pilots still mis-identified Camels and SE5s) and who was also claimed by Werner;
Nieppe is 4 Km south-east of Bailleul so is 20 Km north-east of where Stone came down;
Because there's no fatal German casualty recorded on this date doesn't mean there wasn't one - there are examples where aeroplanes fell on the allied side of the lines but the names of the crewmen do not appear as casualties.
The 2 June 1918 episode:
The earliest Camel involvement I can see was a flight from 208 Sqn led by Capt W L Jordan; he, Lt P M Dennett, Lt R L Johns and Lt J S McDonald claimed an Albatros scout "destroyed" shortly after mid-day to the north of Lestrem (about 14 Km south of Bailleul) - Johns claimed another out of control at 12:20 between Merville and Estaires.
I have found a better location for Pacaut (now known as Pacault ?), this being about 9 Km north of Bethune and 5 Km south of Merville; had the crash site been confirmed as being more than 2 km north of Pacaut, it would have been "south of Merville". This would make it about 18 Km south-south-west of Bailleul; still too far away for Dunkelberg to be Clayson's victim, I believe.
Graeme