At that time there lived at Florence, a very distinguished architect, named Filippo di Ser Brunelleschi, of whose works our city is full, and whose merit was so extraordinary, that after his death his statue in marble was erected in the principal church, with an inscription underneath, which still bears testimony to those who read it, of his great talents. This man pointed out, that in consequence of the relative positions of the river Serchio and the city of Lucca, the wastes of the river might be made to inundate the surrounding country, and place the city in a kind of lake. His reasoning on this point appeared so clear, and the advantage to the besiegers so obvious and inevitable, that the Ten were induced to make the experiment. The result, however, was quite contrary to their expectation, and produced the utmost disorder in the Florentine camp; for the Lucchese raised high embankments in the direction of the ditch made by our people to conduct the waters of the Serchio, and one night cut through the embankment of the ditch itself, so that having first prevented the water from taking the course designed by the architect, they now caused it to overflow the plain, and compelled the Florentines, instead of approaching the city as they wished, to take a more remote position. The design having failed, the Council of Ten, who had been re-elected, sent as commissary, Giovanni Guicciardini, who encamped before Lucca, with all possible expedition. Pagolo Guinigi finding himself thus closely pressed, by the advice of Antonio del Rosso, then representative of the Siennese at Lucca, sent Salvestro Trento and Leonardo Bonvisi to Milan, to request assistance from the duke; but finding him indisposed to comply, they secretly engaged, on the part of the people, to deliver their governor up to him and give him possession of the place; at the same time intimating, that if he did not immediately follow this advice, he would not long have the opportunity, since it was the intention of Pagolo to surrender the city to the Florentines, who were very anxious to obtain it. The duke was so much alarmed with this idea, that, setting aside all other considerations, he caused Count Francesco Sforza, who was engaged in his service, to make a public request for permission to go to Naples; and having obtained it, he proceeded with his forces directly to Lucca, though the Florentines, aware of the deception, and apprehensive of the consequences, had sent to the count, Boccacino Alamanni, his friend, to frustrate this arrangement. Upon the arrival of the count at Lucca, the Florentines removed their camp to Librafatta, and the count proceeded immediately to Pescia, where Pagolo Diacceto was lieutenant governor, who, promoted by fear rather than any better motive, fled to Pistoia, and if the place had not been defended by Giovanni Malavolti, to whom the command was intrusted, it would have been lost. The count failing in his attempt went to Borgo a Buggiano