He carried letters for the Marquis of Sandricourt.
As they arrived late on the evening of the 19th, the Genevois was at once led up and down the streets of Nimes, and, as he had promised, he pointed out several houses in the district of Sainte-Eugenie.
Sandricourt at once ordered the garrison officers, as well as those of the municipal and Courten regiments, to put all their soldiers under arms and to station them quietly throughout the town so as to surround that district.

At ten o'clock, the Marquis of Sandricourt, having made certain that his instructions had been carefully carried out, gave orders to MM.

de L'Estrade, Barnier, Joseph Martin, Eusebe, the major of the Swiss regiment, and several other officers, along with ten picked men, to repair to the house of one Alison, a silk merchant, this house having been specially pointed out by the prisoner.

This they did, but seeing the door open, they had little hope of finding the chiefs of a conspiracy in a place so badly guarded; nevertheless, determined to obey their instructions, they glided softly into the hall.

In a few moments, during which silence and darkness reigned, they heard people speaking rather loudly in an adjoining room, and by listening intently they caught the following words: "It is quite sure that in less than three weeks the king will be no longer master of Dauphine, Vivarais, and Languedoc.