Dear Ralph, this is an interesting case--can you elaborate on your reference to "Austrians"? Austrian library sites?
The "Grundrisz zur Geschichte der deutschen Dichtung" Bd. VI, pp. 457-8 (see link below) give Louis Amanley de Guehry (or Guéhery--also the spelling used by the BNF) as being born in Paris in 1779. He goes to Berlin (1799-1804), first as a teacher at the Royal Prussian Artillery School and then "als Adjutant." From 1804 he "privatisierte" in Dresden but was attached to N's GQG in 1813 and accompanied N to Silesia. The only publications attributed to him appear to be theatrical pieces such as "Die Kosaken."
Welcome any other thoughts on this individual and how he was related to Dressler (who seems legitimately the author most of items Sir Steve recently posted).