Many thanks to you folks who put me on a valid track. Answers I have found, so far, lead to questions.
I have identifed French officials “Sartine” and “Montbarey” as having a plan to invade Hampshire. The plan was completed [by] March 19, 1779.
Who were these two people?
“French officials” is vague. What rank or position in what part of French military or civilian service were they?
Where can I find English-language biographical sketches for these people?