So,
Just found this, only skimmed the article but looks like it should be of interest (to some).
https://www.persee.fr/doc/bec_0373-6237_1990_num_148_1_450572
"Les instructions de l’empereur, transmises par le major général Berthier, étaient à la fois insuffisantes et chimériques. Elles laissaient entendre, certainement à dessein." p 118

Interestingly Broers quotes (Nicole) Gotteri's biography of the marshall, which obviously draws on this article, for the invasion of Portugal (Spirit of the Age: 1805-1810).
"The Emperors's instructions ... were both insufficient and chimerical. Then tended to turn the expedition into a sort of military promenade following an itinerary bereft of any obstacle."
I would (with respect) probably suggest "were both inadequate and unrealistic"
Broers, p. 407, citing Gotteri, Soult, p 253
https://books.google.co.uk/books?id=wDw8DwAAQBAJ&pg=PT344#v=onepage&q&f=false

Best as always
A