Cesare made Cesena his headquarters, and with an army consisting of 300 French lances, 4000 Gascons and Swiss, besides Italian troops, he attacked Imola, which surrendered at once, and then besieged Forll, held by Caterina Sforza, the widow of Girolamo Riario.
He subdued the Gascons, and defended Narbonne against the infidels.
The neighbouring lords attacked and ravaged the municipal territories; grave injuries were inflicted by the mercenary bands, especially by the Bretons and Gascons.
But between 1248 and 1252 Henry alienated Montfort from his cause by taking the side of the Gascons, whom the earl had provoked to rebellion through his rigorous administration of their duchy.
Then in 1395 he went to take up the government of his duchy; thanks chiefly to his lavish expenditure his administration was not unsuccessful, but the Gascons had from the first objected to government except by the crown, and secured his recall within less than a year.