After a complex series of actions, Quosdanovich's column came to grief at the Battle of Lonato on 3 August and retreated. Bonaparte then turned on Wurmser and defeated him at the Battle of Castiglione on 5 August. Before retreating up the Adige valley, Wurmser threw two brigades into the fortress and evacuated some of the sick. Because of the loss of his heavy cannons, Bonaparte could no longer try to reduce Mantua by breaching its walls. Instead, he was forced to blockade the city.