The two ships left Brest on the 1 August 1785 and were last seen at Botany Bay, New Holland on 26 January 1788.
Collignon was born in Metz, France in 1762.
Collignon was just 24 and had previously only worked under the direction of Thouin, who judged him as "active and intelligent".
Thouin in his recommendation emphasised that Collignon should not be subordinate to the expedition's botanist, Joseph Hugues Boissieu La Martinière, and so the two were assigned to different ships.
Collignon was permitted to assist the other naturalists provided this did not interfere with his principal mission.