The Florentines, being thus relieved from the attack in the direction of Pisa, assembled the whole force between Colle and Santo Geminiano. But the army, on the arrival of Count Carlo, being composed of Sforzeschi and Bracceschi, their hereditary feuds soon broke forth, and it was thought that if they remained long in company, they would turn their arms against each other. It was therefore determined, as the smaller evil, to divide them; to send one party, under Count Carlo, into the district of Perugia, and establish the other at Poggibonzi, where they formed a strong encampment in order to prevent the enemy from penetrating the Florentine territory. By this they also hoped to compel the enemy to divide their forces; for Count Carlo was understood to have many partisans in Perugia, and it was therefore expected, either that he would occupy the place, or that the pope would be compelled to send a large body of men for its defense. To reduce the pontiff to greater necessity, they ordered Niccolo Vitelli, who had been expelled from Citta di Castello, where his enemy Lorenzo Vitelli commanded, to lead a force against that place, with the view of driving out his adversary and withdrawing it from obedience to the pope. At the beginning of the campaign, fortune seemed to favor the Florentines; for Count Carlo made rapid advances in the Perugino, and Niccolo Vitelli, though unable to enter Castello, was superior in the field, and plundered the surrounding country without opposition. The forces also, at Poggibonzi, constantly overran the country up to the walls of Sienna. These hopes, however, were not realized; for in the first place, Count Carlo died, while in the fullest tide of success; though the consequences of this would have been less detrimental to the Florentines, had not the victory to which it gave occasion, been nullified by the misconduct of others. The death of the count being known, the forces of the church, which had already assembled in Perugia, conceived hopes of overcoming the Florentines, and encamped upon the lake, within three miles of the enemy. On the other side, Jacopo Guicciardini, commissary to the army, by the advice of Roberto da Rimino, who, after the death of Count Carlo, was the principal commander, knowing the ground of their sanguine expectations, determined to meet them, and coming to an engagement near the lake, upon the site of the memorable rout of the Romans, by Hannibal, the Carthaginian general, the papal forces were vanquished. The news of the victory, which did great honor to the commanders, diffused universal joy at Florence, and would have ensured a favorable termination of the campaign, had not the disorders which arose in the army at Poggibonzi thrown all into confusion; for the advantage obtained by the valor of the one, was more than counterbalanced by the disgraceful proceedings of the other. Having made considerable booty in the Siennese territory,