No reason to take any offense on this. None was intended. I fully appreciate those who do original research. My only point was that it is something I, personally, do not do.
I looked and saw all but nothing but old references on Moira's expedition. If you would like to provide any modern sources that address this subject, would love to see it.
Thanks for your input. I do appreciate it.

I've got over it!

A handy reference on the French Engineer officers serving with the British in the Revolutionary Wars is in Vicomte Grouvel's "Les Corps de Troupe de l'Emigration Francaise" Vol 1 pp. 179-181 - this (as well as many other articles) can be downloaded from the website of La Sabretache for a very modest fee - see http://lasabretache.fr/categorie-produit/fonds-documentaire/grouvel-tome-i/