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.
The Florentines, having occupied San Miniato, held a council of war to decide whether they should attack Pisa or the army of Castruccio, and, having weighed the difficulties of both courses, they decided upon the latter.

The river Arno was at that time low enough to be fordable, yet the water reached to the shoulders of the infantrymen and to the saddles of the horsemen.

On the morning of 10 June 1328, the Florentines commenced the battle by ordering forward a number of cavalry and ten thousand infantry.