From 1782, he took part in the Naval operations in the American Revolutionary War on the 80-gun Deux Frères, captained by his father.
The following year, he was given command of the corvette Vaillante, tasked with escort duties in the English Channel.
The squadron found itself blocked by cold and damage in a Norwegian harbour during the entire winter of 1794 - 1795, sustaining over 250 dead from illness out of a total complement of 880.
In spring, Seine and Galathée returned to France, leaving Républicaine to care for the untransportable sick.
In March 1796, Le Bozec was promoted to commander and set sail for a patrol off the coasts of Africa and Brazil, capturing 76 prizes.
In 1798 it captures the ship Rainha dos Anjos (Queen of Angels) in Maldonado (today, Uruguay).
After two patrols, Le Bozec was informed of the abdication of Napoleon and the end of the War of the Sixth Coalition.