In the early part of May 1328, the Florentines put in motion this army and quickly occupied Lastra, Signa, Montelupo, and Empoli, passing from thence on to San Miniato. When Castruccio heard of the enormous army which the Florentines were sending against him, he was in no degree alarmed, believing that the time had now arrived when Fortune would deliver the empire of Tuscany into his hands, for he had no reason to think that his enemy would make a better fight, or had better prospects of success, than at Pisa or Serravalle. He assembled twenty thousand foot soldiers and four thousand horsemen, and with this army went to Fucecchio, whilst he sent Pagolo Guinigi to Pisa with five thousand infantry. Fucecchio has a stronger position than any other town in the Pisan district, owing to its situation between the rivers Arno and Gusciana and its slight elevation above the surrounding plain. Moreover, the enemy could not hinder its being victualled unless they divided their forces, nor could they approach it either from the direction of Lucca or Pisa, nor could they get through to Pisa, or attack Castruccio's forces except at a disadvantage. In one case they would find themselves placed between his two armies, the one under his own command and the other under Pagolo, and in the other case they would have to cross the Arno to get to close quarters with the enemy, an undertaking of great hazard. In order to tempt the Florentines to take this latter course, Castruccio withdrew his men from the banks of the river and placed them under the walls of Fucecchio, leaving a wide expanse of land between them and the river.