Augereau, Pierre François Charles pyĕr fräNswä´ shärl ōzhərō´ [key], 1757–1816, marshal of France. He fought in the French Revolutionary and Napoleonic wars and was a principal in the coup of 18 Fructidor (Sept. 4, 1797). For his heroism in the Italian campaign he was made duke of Castiglione. After the restoration of the Bourbons in 1814, Augereau rallied to Louis XVIII.