In the event, Bonaparte outmaneuvered Beaulieu during the Montenotte Campaign. After the French mauled his right wing in battles at Montenotte and Dego, Beaulieu watched in stunned inactivity as the French knocked Sardinia out of the war at the battles of Millesimo, Ceva, and Mondovì. Beaulieu withdrew his army behind the Po, hoping the river would stop the French advance. But Bonaparte marched west to cross the river near Piacenza, behind the Austrian left flank. The French defeated Anton Lipthay de Kisfalud at the Battle of Fombio on 7 to 9 May 1796. Hastily, Beaulieu withdrew his army to the east, dropping off a force under Karl Philipp Sebottendorf to hold the bridge over the Adda River at Lodi. Bonaparte seized the bridge in the Battle of Lodi on 10 May, driving back Sebottendorf with losses of 2,000 casualties and 14 guns. The Austrians abandoned Duchy of Milan and pulled back to the Mincio River. A minor defeat at the Battle of Borghetto on 30 May forced Beaulieu to abandon the Mincio line and retreat north to the Tyrol. Before leaving the Po valley, he left a strong garrison in the fortress of Mantua. The Siege of Mantua would become the focus of many battles during the remainder of 1796. During the retreat, Beaulieu relieved Lipthay from command of the rearguard for retreating too quickly. Thomas Graham, an English observer with the Habsburg army, noted that Beaulieu seemed to expect too much from his soldiers, was irritated, and tended to blame the failure of his plans on others for not properly executing his orders. Graham also deplored the "petty intrigue" among the Austrian officers.