At some point between 1797 and 1802, the Chégaray brothers commissioned Mon Oncle Thomas and put her under the command of Abraham-Jean-Louis Giscard.

[2] 1st privateering cruise (December 1799–April 1800): On 7 November 1800, Mon Oncle Thomas, Captain Jean Fizel, left La Rochelle.

Leander was returning to England from Jamaica and was carrying a cargo of coffee, sugar, and indigo; she had an estimated value of Fr.1.5mn.

The Commandant promised to renew the letter on condition that Mon Oncle Thomas join an expedition from Cayenne that had come to recapture the island of Gorée from the British.

When Mon Oncle Thomas arrived at Cayenne Papin sold the remaining four slaves to Farnous & Co., for 4,693 francs.

[1] On 16 April Mon Oncle Thomas captured the slave ship Venus, Hassler, master, off the Windward Coast.

[13] French sources report that the Tribunal of Commerce in La Rochelle valued the gains on the voyage from the sales of slaves, cargo, and captured vessels at 261,753 francs.