Does Werther or War and Peace have more acts?
War and Peace (opera) War and Peace (Op. 91) (Russian: Война и мир , "Voyna i mir") is an opera in two parts (an Epigraph and 13 scenes), sometimes arranged as five acts, by Sergei Prokofiev to a Russian libretto by the composer and Mira Mendelson, based on the novel "War and Peace" by Leo Tolstoy. Although Tolstoy's work is classified as a novel, the 1812 invasion of Russia by the French was based on real-life events, and some real-life people appear as characters in both the novel and the opera, e.g. Prince Mikhail Kutuzov and Napoleon Bonaparte.
Der Waffenschmied Der Waffenschmied (The Armourer) is an opera (Singspiel) in three acts by Albert Lortzing. The German-language libretto was by the composer after Friedrich Wilheim von Ziegler's "Liebhaber und Nebenbuhler in einer Person" (Lover and Rival in One Person). This is often considered his third most popular work. His works are considered to be part of the Biedermeier period. It premiered in Vienna at the Theater an der Wien on 31 May 1846 conducted by Lortzing. The role of Marie was written with Jenny Lind in mind who he hoped would sing the part. The opera was eventually successful enough that Lortzing was offered the post of Kapellmeister at the theatre which he held until the revolution of 1848, when he had to return to Leipzig. Arnold Schönberg, arranged Lortzing’s "Waffenschmied“ for piano for 4 hands. The story is set in the city of Worms in the 16th century.