 From June 3 to 8, the bulk of the allied army crossed the Po at Sacca to join the defensive position there.On June 4 and 5 a detachment of Sardinian troops drove the Austrians from Colorno, who retreated to Sorbolo to plan an attack against the allied position at Parma.Marshal Coigny determined to make a stand at Parma, and on June 28 established a strong position outside the city walls.