to the defense of the attacked state. With skilful manipulation of European politics, Bismarck created a situation in which France would play the role of aggressor in German affairs, while Prussia would play that of the protector of German rights and liberties. At the Congress of Vienna in 1815, Metternich and his conservative allies had reestablished the Spanish monarchy under King Ferdinand VII. Over the following forty years, the great powers supported the Spanish monarchy, but events in 1868 would further test the old system, finally providing the external trigger needed by Bismarck. Spanish prelude A revolution in Spain overthrew Queen Isabella II, and the throne remained empty while Isabella lived in sumptuous exile in Paris. The Spanish, looking for a suitable Catholic successor, had offered the post to three European princes, each of whom was rejected by Napoleon III, who served as regional power-broker. Finally, in 1870 the Regency offered the crown to Leopold of Hohenzollern-Sigmaringen, a prince of the Catholic cadet Hohenzollern line. The ensuing furor has been dubbed by historians as the Hohenzollern candidature. Over the next few weeks, the Spanish offer turned into the talk of Europe. Bismarck encouraged Leopold to accept the offer. A successful installment of a Hohenzollern-Sigmaringen king in Spain would mean that two countries on either side of France would both have German kings of Hohenzollern descent. This may have been a pleasing prospect for Bismarck, but it was unacceptable to either Napoleon III or to Agenor, duc de Gramont, his minister of foreign affairs. Gramont wrote a sharply formulated ultimatum to Wilhelm, as head of the Hohenzollern family, stating that if any Hohenzollern prince should accept the crown of Spain, the French government would respond—although he left ambiguous the nature of such response. The prince withdrew as a candidate, thus defusing the crisis, but the French ambassador to Berlin would not let the issue lie. He approached the Prussian king directly while Wilhelm was vacationing in Ems Spa, demanding that the King release a statement saying he would never support the installation of a Hohenzollern on the throne of Spain. Wilhelm refused to give such an encompassing statement, and he sent Bismarck a dispatch by telegram describing the French demands. Bismarck used the king's telegram, called the Ems Dispatch, as a template for a short statement to the press. With its wording shortened and sharpened by Bismarck—and further alterations made in