 At twelve years of age he was nominated colonel of the first regiment of chasseurs, and in 1830 entered the "Chambre des Pairs".As early as 1825 his name was mentioned as a possible candidate for the throne of Greece, and in February 1831 he was nominated king of the Belgians, but international considerations deterred Louis-Philippe from accepting the honour for his son, who was accompanying the French army that entered Belgium to support the new kingdom in its separation from the United Kingdom of the Netherlands; there he took part in the siege of Antwerp.He accompanied the Algerian expedition against the town of Constantine in the autumn of 1836, and in a second expedition (1837) he was entrusted with the command of a brigade and with the direction of the siege operations before Constantine.