Which has more acts, Die Walküre or La fille du régiment?
La fille du régiment La fille du régiment ("The Daughter of the Regiment") is an opéra comique in two acts by Gaetano Donizetti, set to a French libretto by Jules-Henri Vernoy de Saint-Georges and Jean-François Bayard. It was first performed on 11 February 1840 by the Paris Opéra-Comique at the Salle de la Bourse.
Die geschiedene Frau Die geschiedene Frau ("The Divorcée"), is an operetta in three acts by Leo Fall with a libretto by Victor Léon, after Victorien Sardou's "Divorçons!". Conducted by the composer, It opened to considerable success at the Carltheater in Vienna on 23 December 1908 with Hubert Marischka as Karel.