 That same day Grand Duke Constantine arrived with the army, thirsting for action.On 9 May, Suvorov's chief of staff, the Austrian Johann Gabriel Chasteler de Courcelles and two battalions chased the French out of the town of Tortona, though not its citadel.Desiring to concentrate his army on the south bank, Suvorov issued orders to Rosenberg to cross the Po at Alluvioni Cambiò - that is, downstream from the confluence of the Po and Tanaro rivers.