Unable to dislodge the Papal forces at Vicenza, field marshal Radetzky decided to concentrate his forces against the Piedmontese army. On 28 May 1848, he marched his army towards Mantua where a Tuscan Division was warily observing the fortress. While the Piedmontese army's attention was diverted by an Austrian brigade on the Rivoli plateau on 28 and 29 May 1848, field marshal Radetzky engaged and defeated the Tuscan division at the battle of Curtatone and Montanara on 29 May 1848. Many of the defeated and disillusioned Tuscan volunteers returned home, marking the end of the Tuscan division as a fighting force. Both the Piedmontese and the Austrian armies were now concentrated on the Mincio side of the Quadrilatero: the Piedmontese south of Peschiera, the Austrians in control of Mantua. Radetzky sent his troops north to relieve Peschiera.