In July 1870, the Franco-Prussian War began. In early August, Napoleon III recalled his garrison from Rome and could no longer protect what remained of the Papal States. Widespread public demonstrations demanded that the Italian government take Rome. The Italian government took no direct action until the collapse of Napoleon at the battle of Sedan. King Victor Emmanuel II then sent Count Gustavo Ponza di San Martino to Pius IX with a personal letter offering a proposal that would have allowed the peaceful entry of the Italian Army into Rome, under the guise of protecting the pope.