Hi Volker:
The Fok.D.VII was issued to
Jasta 10 in mid May 1918 also to
Jasta 11in preparation for the Operation Blücher to commence on 27 May 1918. By 1 June 1918, a number of Jasta had been equipped with the Fok.D.VII I would surmise the first reports would have come from French Escadrilles.
Jadgeschwader Nr.1 Richthofen was assigned to the German
7.Armee for
Operation Blücher. I believe the first captured Fok.D.VII was Fok.D.VII(OAW) 2009/17, I think it was from
Jasta24s. The second, was Fok.D.VII 368/18,
Ltn. Hans Schultz of Jasta 18 was shot down and taken as a POW on 6 June 1918. The third machine was Fok.D.VII 382/18 flown by
Ltn. Georg von Hantlemann of
Jasta 15, but was borrowed by
Ltn.
Kurt Wüsthoff of Jasta 15, who was shot down on 17 June 1918 and taken POW. They were seen in late May and captured in early June 1918 on both the French and British Fronts. None were issued or seen in April 1918.
Blue skies Volker,
Dan-San