The progress of the Sardinian army compelled Francis to give up the line of the Volturno, and he eventually took refuge, with his best troops, in the fortress of Gaeta. On the maintenance of this fortress hung the fate of the kingdom of Naples. Its defence is the only bright point in the career of the feeble Francis, whose courage was aroused by the heroic resolution of his young wife, the Bavarian Princess Mary. For three months the defence continued. But no European power came to the aid of the king, disease appeared with scarcity of food and of munitions of war, and the garrison was at length forced to capitulate. The fall of Gaeta was practically the completion of the great work of the unification of Italy. Only Rome and Venice remained to be added to the united kingdom. On February 18, 1861, Victor Emmanuel assembled at Turin the deputies of all the states that acknowledged his supremacy, and in their presence assumed the title of King of Italy, which he was the first to bear. In four months afterwards Count Cavour, to whom this great work was largely due, died. He had lived long enough to see the purpose of his life practically accomplished. Great as had been the change which two years had made, the patriots of Italy were not satisfied. "Free from the Alps to the Adriatic!" was their cry; "Rome and Venice!" became the watchword of the revolutionists. Mazzini, who had sought to found a republic, was far from content, and the agitation went on. Garibaldi was drawn into it, and made bitter complaint of the treatment his followers had received. In 1862, disheartened at the inaction of the king, he determined to undertake against Rome an expedition like that which he had led against Naples two years before. [=Garibaldi's Expedition Against Rome=] In June he sailed from Genoa and landed at Palermo, where he was quickly joined by an enthusiastic party of volunteers. They supposed that the government secretly favored their design, but the king had no idea of fighting against the French troops in Rome and arousing international complications, and he energetically warned all Italians against taking part in revolutionary enterprises. [=Sent Back to Caprera=]