Question: Which uncompleted opera was written by the composer of Croquefer, ou Le dernier des paladins?

Context articles: Le Dernier qui a parlé...
The Last Flight (2009 film)
Croquefer, ou Le dernier des paladins
Le Dernier des fous
Prosper-Didier Deshayes
Jacques Offenbach
The Last of the Unjust
The Last of the Vikings
The Last of the Just
Le Dernier Cri

"Le Dernier qui a parlé..." (English translation: "The last one who spoke...") was the French entry in the Eurovision Song Contest 1991, performed in French by Amina as "C'est le dernier qui a parlé qui a raison"
The Last Flight (Le dernier vol) is a 2009 French film.
 Directed by Karim Dridi, it stars Marion Cotillard and Guillaume Canet.
 The film is based on the French novel "Le dernier vol de Lancaster" by Sylvain Estibal which is loosely based on the real life events surrounding the disappearance of British aviator Bill Lancaster.
Croquefer, ou Le dernier des paladins is a one-act opéra bouffe by Jacques Offenbach to a French libretto by Adolphe Jaime and Étienne Tréfeu, first performed in 1857.
Le Dernier des fous (also titled The Last of the Crazy People and Demented) is a 2006 French drama film directed by Laurent Achard.
 It won the Best Direction Award at the Locarno International Film Festival.
Prosper-Didier Deshayes (mid 18th century – 1815) was an opera composer and dancer who lived and worked in France.
 In 1764 he was a balletmaster at the Comédie-Française.
 By 1774 he had become an assistant ("adjoint") at the Paris Opéra.
 His first opera "Le Faux serment ou La Matrone de Gonesse", a "comédie mêlée d'ariettes" in two acts, was first performed on 31 December 1785 at the Théâtre des Beaujolais in Paris and became a popular success.
 He went on to have another 18 works performed at various venues in Paris, but only two, "La faut serment" and "Zélie, ou Le mari à deux femmes", a 3-act "drame" first performed at the Salle Louvois on 29 October 1791, were ever published as musical scores.
 He also participated in the collaborative Revolutionary opera "Le congrès des rois", a 3-act "comédie mêlée d'ariettes", which combined music written by Deshayes and 11 other composers and was first performed by the Opéra-Comique at the Salle Favart on 26 February 1794.
 He died in Paris.
Jacques Offenbach (] ; ] ; 20 June 1819 – 5 October 1880) was a German-born French composer, cellist and impresario of the romantic period.
 He is remembered for his nearly 100 operettas of the 1850s–1870s and his uncompleted opera "The Tales of Hoffmann".
 He was a powerful influence on later composers of the operetta genre, particularly Johann Strauss, Jr. and Arthur Sullivan.
 His best-known works were continually revived during the 20th century, and many of his operettas continue to be staged in the 21st.
 "The Tales of Hoffman" remains part of the standard opera repertory.
The Last of the Unjust (original French title:Le Dernier des injustes) is a 2013 French documentary film directed by Claude Lanzmann that centres on the activities of Rabbi Benjamin Murmelstein in the Theresienstadt concentration camp, during The Holocaust.
The Last of the Vikings (Italian:L'ultimo dei Vikinghi, French:Le Dernier des Vikings) is a 1961 French-Italian historical film directed by Giacomo Gentilomo and starring Cameron Mitchell, Edmund Purdom and Isabelle Corey.
 The film was allegedly co-directed by Mario Bava who was uncredited.
The Last of the Just is a post-war novel by André Schwarz-Bart originally published in French (as "Le Dernier des justes") in 1959.
 It was published in an English translation by Stephen Becker in 1960.
 It was Schwarz-Bart's first book and won the Prix de Goncourt, France's highest literary prize.
 The author was the son of a Polish Jewish family murdered by the Nazis and he based the story on a Hebrew legend.
Le Dernier Cri is a Marseille based publishing house focused on publishing books, prints, silkscreens, posters and original art of visual artists that produce underground art.
 Pakito Bolino and Caroline Sury started the organisation in 1992.
 Besides publishing art le Dernier Cri also sets up other activities such as film screening, and expositions.