The letter of Lorenzo de’ Medici and those of Francesco Sforza to Cosimo relate to a second war with Lucca, and need some explanation. The recall of Cosimo from exile, as told in his diary, was followed by a wholesale banishment of his enemies from Florence, and left him practically master of the Republic. The exiled Florentines naturally desired to return, and according to the custom of the time were eager to invoke foreign aid. The times for long offered no opportunity. But in 1436 Genoa at last shook off the yoke of the Duke of Milan and became a republic. The sister republics of Florence and Venice at once allied themselves with the new free State, and Filippo Visconti believed himself to be seriously threatened by the new league. He had at the same time lost the services of one of his two great generals. Francesco Sforza, determined to acquire a principality for himself, had seized part of the Marches which nominally belonged to the Popes. In these circumstances the Duke of Milan resolved to attack Florence, the one of the allies which lay nearest to him. While the Florentines engaged mercenary troops (Taliano, or Tagliano, mentioned in the letters, being one of the leaders of small bands) and named Sforza the General of the Republic--a very untrustworthy general, as events proved. In the war which ensued Lucca was attacked by the Florentines and defended by the troops of Milan. In 1438 Florence was twice threatened by Visconti’s army, then in the territory of Lucca. The second time they were led by the famous condottiere Niccolò Piccinino, and Francesco Sforza had orders to oppose him and if possible to seize Lucca. The attempt failed, partly because Sforza, always hoping to obtain the hand of Madonna Bianca, Visconti’s illegitimate daughter, did not wish to offend him by fighting against his troops, partly because Venice, jealous of the possible acquisition of Lucca by Florence, laid claim to his services and refused to pay her share of his stipend unless her commands were obeyed. Cosimo went to Venice “thinking,” writes Machiavelli, “to be able to persuade her. To the Senate he pointed out the condition of Italy, the power of the Duke of Milan, his reputation and the number of his troops, and concluded by saying that if the Count (Sforza) went over to him they would together command the sea, and the liberty of Venice would be endangered. To this the Venetians replied that they well knew their own power and the power of the Italians, and believed they could defend themselves. Adding that they were not in the habit of recompensing soldiers for serving others, and that the Florentines, having made use of the Count, might pay him themselves. They considered it more necessary for the safety of their State to lower his pride than to give him money; and the ambition of men being unlimited, if he were paid now without serving them, he would eventually advance far more dishonest and dangerous demands. Thus it