contrived, however, to compel him to keep faith with his own party. On June 1, 1288, the army of the League took the field. It comprised nobles and _popolani_ from every part of Tuscany, and together with the mercenary troops reached a total of 2,600 horse and 12,000 foot. They carried on the campaign for twenty-two days, capturing and razing about forty castles, great and small, on the Aretine territory; but then a great storm wrought so much damage to their encampments, that they were forced to beat a retreat. As a mark of insult to the enemy, they had held races under the walls of Arezzo, naming twelve knights _di corredo_;[327] but then, raising the siege, they went back to Florence, leaving their foes unconquered and undismayed. In fact, when the Siennese separated from the main body on the way to their own city, they were surprised by a band of Aretines in ambush, and thoroughly routed. During the month of August the Florentines joined with the Pisan Guelph exile, Nino di Gallura, made raids on Pisan lands, and occupied the Castle of Asciano; then, in September, they marched against the Aretines, who had now gathered an army of seven hundred horse and eight thousand foot. No pitched battle, however, took place, for the enemy retreated before the Florentines, leaving them to devastate the country at their will, but afterwards made reprisal in the beginning of 1289, by laying waste the Florentine territory, and penetrating almost as far as San Donato. These variously important skirmishes paved the way for more serious hostilities. All Tuscany was now preparing for war. The captain elected by Pisa was Count Guido da Montefeltro, who had risen to the highest distinction by his victory over the French troops of Charles of Anjou at the battle of Forlì. He was undoubtedly one of the bravest warriors of the time, and on his arrival in Pisa quickly reorganised the militia, and created a new body of light infantry of three thousand crossbowmen, able to do good service against the heavy cavalry then considered the chief strength of an army. On the other hand, the Aretines increased their forces so much, that when Charles II. of Anjou passed through Florence on the way to his coronation in Naples, the Florentines were obliged to grant him an escort of their best horse and foot soldiers, to protect him from the attack threatened by the men of Arezzo. On this occasion they asked the king for a good leader, to enable them to pursue the campaign energetically, and Amerigo de Narbonne being appointed to the post, he joined them, accompanied by William de Durfort and one hundred men-at-arms.