For three years, there was an indecisive struggle between the heterogeneous Assembly and the President, who was silently awaiting his opportunity. He chose as his ministers men with little inclination towards republicanism, with a preference for Orléanists, the chief of whom was Odilon Barrot. In order to strengthen his position, he endeavored to conciliate the reactionary parties, without committing himself to any of them. The chief instance of this was the expedition to Rome voted by the Catholics, to restore the temporal authority of the Pope Pius IX, who had fled Rome in fear of the nationalists and republicans. (Garibaldi and Mazzini had been elected to a Constitutional Assembly.) The Pope called for international intervention to restore him in his temporal power. The French President moved to establish the power and prestige of France against that of Austria, as beginning the work of European renovation and reconstruction which he already looked upon as his mission. French troops under Oudinot marched into Rome. This provoked a foolish insurrection in Paris in favor of the Roman Republic, that of the Château d'Eau, which was crushed on 13 June 1849. On the other hand, when the Pope, though only just restored, began to yield to the general movement of reaction, the President demanded that he should set up a Liberal government. The Pope's dilatory reply having been accepted by the French ministry, the President replaced it on 1 November, by the Fould-Rouher cabinet.