After Léon Gambetta dissolved the departmental general councils on 26 December 1870, Daru and Arthur Legrand protested the measure.[3]
During the French Third Republic Daru was a member of the National Assembly for Manche from 8 February 1871 to 7 March 1876. He belonged to the Orléanist parliamentary group, Centre droit.
He was a member of the Senate from 30 January 1876 to 4 January 1879.
Napoléon Daru died on 20 February 1890 in Paris.[1]
Napoléon Daru (in French), Assemblée nationale, retrieved 2018-01-26
Robert, Adolphe; Cougny, Gaston (1889–1891), "LEGRAND (ARTHUR-MARIE-ALEXIS)", in Edgar Bourloton (ed.), Dictionnaire des Parlementaires français (1789–1889) (in French), retrieved 2018-01-26