After Castiglione, Bonaparte had rearranged his intelligence gathering: the French representative in Venice, Lallement, was sent money to pay for spies to check out the areas between Venice and Trent and Bonaparte's station chief, Angelo Pico, based at Pescheira, sent his men forward into the Tyrol. More importantly, his spy Francesco Toli had penetrated Austrian headquarters and forewarned Bonaparte that Wurmser had left Davidovich at Trento. So, Bonaparte struck first, sending Masséna and Augereau north toward Trento. Meanwhile, Vaubois advanced past Lake Idro to Riva at the north end of Lake Garda. Vaubois and Masséna converged on Rovereto on the Adige. At the Battle of Rovereto on 4 September, the French routed Davidovich's outnumbered troops, inflicting 3,000 casualties at a cost of 750 killed and wounded.