Victor Emmanuel supported the Expedition of the Thousand (1860–1861) led by Giuseppe Garibaldi, which resulted in the rapid fall of the Kingdom of the Two Sicilies in southern Italy. However, Victor Emmanuel halted Garibaldi when he appeared ready to attack Rome, still under the Papal States, as it was under French protection. In 1860, Tuscany, Modena, Parma and Romagna decided to side with Sardinia-Piedmont, and Victor Emmanuel then marched victoriously in the Marche and Umbria after the victorious battle of Castelfidardo over the Papal forces. He subsequently met Garibaldi at Teano, receiving from him the control of southern Italy and becoming the first King of Italy on 17 March 1861.