/ H.B. De Saussure - Col du Geant 1788
Looking in Voyages dans les Alpes. Tome 4 in the chapter on the traverse there are only four people mentioned:
Alexis Balmat (a porter)
P J Favret (best friend of Alexis Balmat)
Other people are implied as being there to but the latter are only mentioned explicitly because Alexis fell into a crevasse and Favret got lowered down to him to rescue him.
Thanks, very helpful.
Jean-Michel Cachat (also known as Cachat the giant)
The names are given the the memoires of Jean-Michel Cachat.
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