Question: Which uncompleted opera was written by the composer of Croquefer, ou Le dernier des paladins?
Sentence (from "Croquefer, ou Le dernier des paladins"): 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.
Relevant evidence: Yes