Filippo, finding the Florentines resolved to occupy the places he had undertaken to defend, postponed all personal considerations, and sent Agnolo della Pergola with a strong force against Imola, that Ludovico, having to provide for the defense of his own possessions, might be unable to protect the interests of his grandson. Agnolo approached Imola while the forces of the Florentines were at Modigliana, and an intense frost having rendered the ditches of the city passable, he crossed them during the night, captured the place, and sent Lodovico a prisoner to Milan. The Florentines finding Imola in the hands of the enemy, and the war publicly known, sent their forces to Furli and besieged it on all sides. That the duke’s people might not relieve it, they hired Count Alberigo, who from Zagonara, his own domain, overran the country daily, up to the gates of Imola. Agnolo della Pergola, finding the strong position which the Florentines had taken prevented him from relieving Furli, determined to attempt the capture of Zagonara, thinking they would not allow that place to be lost, and that in the endeavor to relieve it they would be compelled to give up their design against Furli, and come to an engagement under great disadvantage. Thus the duke’s people compelled Alberigo to sue for terms, which he obtained on condition of giving up Zagonara, if the Florentines did not relieve him within fifteen days. This misfortune being known in the Florentine camp and in the city, and all being anxious that the enemy should not obtain the expected advantage, they enabled him to secure a greater; for having abandoned the siege of Furli to go to the relief of Zagonara, on encountering the enemy they were soon routed, not so much by the bravery of their adversaries as by the severity of the season; for, having marched many hours through deep mud and heavy rain, they found the enemy quite fresh, and were therefore easily vanquished. Nevertheless, in this great defeat, famous throughout all Italy, no death occurred except those of Lodovico degli Obizi and two of his people, who having fallen from their horses were drowned in the morass.
The Florentines murmur against those who had been advocates of the war—Rinaldo degli Albizzi encourages the citizens—Measures for the prosecution of the war—Attempt of the higher classes to deprive the plebeians of their share in the government—Rinaldo degli Albizzi addresses an assembly of citizens and advises the restoration of the Grandi—Niccolo da Uzzano wishes to have Giovanni de’ Medici on their side—Giovanni disapproves of the advice of Rinaldo degli Albizzi.