As a result, Oudinot was able to regroup and await reinforcements; time proved to be on his side, and Mazzini's attempt at diplomacy proved fatal to the Roman Republic. A letter from Louis Napoleon encouraged Oudinot and assured him of French reinforcements. The French government sent Ferdinand de Lesseps to negotiate a more formal ceasefire. Neapolitan troops sympathetic to the Papacy entered Roman Republic territory, and de Lesseps suggested that Oudinot's forces in their current position might protect the city from the converging approach of an Austrian army with the Neapolitan force: the Roman Triumvirate agreed. Many Italians from outside the Papal States went to Rome to fight for the Republic: among them was Goffredo Mameli, who had tried to form a common state joining Roman Republic and Tuscany, and who died of a wound suffered in the defense of Rome.