Aubry began his military career in 1742, when he was commissioned as a second lieutenant in the Lyonnais Infantry Regiment.

After serving in the War of the Austrian Succession as an officer of grenadiers, Aubry left France to take a commission as a captain of colonial troops in Louisiana.

During his term, he met with members of the exiled Acadian community under Beausoleil and encouraged them to settle in the Attakapas Territory, where there were abundant grasslands available for development of a local cattle industry.

After the arrival of a replacement Spanish governor Alejandro O'Reilly, Aubry reportedly provided him with the names of some of the conspirators in the rebellion.

[7] Soon afterwards, Aubry left for France on the Père de Famille, but died in a shipwreck within sight of the French coast.