La battaglia di Legnano (The Battle of Legnano) is an opera in four acts, with music by Giuseppe Verdi to an Italian-language libretto by Salvadore Cammarano. It was based on the play La Bataille de Toulouse by Joseph Méry, later the co-librettist of Don Carlos. In later years Battaglia was given under different settings and different titles until Italian unification allowed for the opera to be presented as originally written. Verdi considered revising it in the 1850s, but never did.