A French marshal; at the Revolution joined the Bourbons on the frontiers; served the royal cause in La Vendée; held high commands under Napoleon; commanded under Ney on Napoleon's return from Elba; deserted on the eve of Waterloo to Louis XVIII.; gave evidence against Ney to his execution; commanded the expedition against Algiers; refused allegiance to Louis Philippe on his accession, and was dismissed the service (1773-1846).