|The Italian War broke out when Austria tried to extend its already extensive control over the Italian penninsular. On May 12, 1859 the French declared war on Austria. They came to the aid of Sardinia and the other Italian city states that had revolted against the Austrains. The French defeated the Austrian army on the field. Franz Joseph, the emperor of Austria, and Napoleon met and brought an end to hostilities. Napoleon, who had become concerned with the unrest caused by revolts, agreed to the restoration of power to most of the Italian princes.