With the outbreak of the Franco-Prussian War in 1870, Offenbach found himself out of favour in Paris because of his imperial connections and his German birth.He remained successful in Vienna and London, however. In his last years he strove to finish The Tales of Hoffmann, but died before the premiere of the opera, which has entered the standard repertory in versions completed or edited by other musicians.He made a favourable impression on the composer and conductor Fromental Halévy, who gave him lessons in composition and orchestration and wrote to Isaac Offenbach in Cologne that the young man was going to be a great composer.
In 1858, Offenbach produced his first full-length operetta, Orphée aux enfers ("Orpheus in the Underworld"), which was exceptionally well received and has remained one of his most played works.During the 1860s, he produced at least 18 full-length operettas, as well as more one-act pieces.The British press reported a triumphant royal command performance; The Illustrated London News wrote, "Herr Jacques Offenbach, the astonishing Violoncellist, performed on Thursday evening at Windsor before the Emperor of Russia, the King of Saxony, Queen Victoria, and Prince Albert with great success." Offenbach returned to Paris with his reputation and his bank balance both much enhanced.The last remaining obstacle to his marriage to Hérminie was the difference in their professed religions; he converted to Roman Catholicism, with the comtesse de Vaux acting as his sponsor.After some encouragement and some temporary setbacks, he seemed on the verge of breaking into theatrical composition when Paris was convulsed by the 1848 revolution, which swept Louis Philippe from the throne and led to serious bloodshed in the streets of the capital.
Returning to Paris in February 1849, Offenbach found the grand salons closed down.Before leaving, he found a number of pupils for Jules; the modest earnings from those lessons, supplemented by fees earned by both brothers as members of synagogue choirs, supported them during their studies.At the conservatoire, Jules was a diligent student; he graduated and became a successful violin teacher and conductor, and led his younger brother's orchestra for several years.Finding the management of Paris' Opéra-Comique company uninterested in staging his works, in 1855 he leased a small theatre in the Champs-Élysées.There he presented a series of his own small-scale pieces, many of which became popular.Offenbach became associated with the Second French Empire of Napoleon III; the emperor and his court were genially satirised in many of Offenbach's operettas.