Here is another source for you:
The german Verein für Computergenealogie (CompGen) is transcribing various lists of Missing and killed in WW 1:
Bob
Thank you for that - one source I hadn't discovered. Every small piece helps in the jigsaw!
His rank is given as Rittm d.A.; Rittmeister I can cope with as a cavalry rank, but could d.A. mean
[in] der Akte, in other words acting rank? Any other thoughts welcomed!
Graham