After his father Charles's death at Quiberon, Maxence de Damas, maternally a great-grandson of the Irish war hero General Sarsfield, was led by his uncle the Duke of Richelieu, who presented him to Czar Paul I to join the military cadet school in Saint Petersburg.

At the request of Louis XVIII, Maxence de Damas began a new military career in France.

He became Minister of War in 1823, designed the Act of 1824, which emphasized commitment to the number, competence through training and length of service.

He managed to solve the crisis in Spain and Portugal, and Greece with the Ottoman Empire, and ordered an archaeological expedition on the Euphrates, which will update the City of Ur and the splendors of Khorsabad.

The baron de Damas returned to France in 1833 and retired to his wife's castle, Hautefort.