Austro-Prussian War
The pretext for the conflict was found in the dispute between Prussia and Austria over the administration of Schleswig-Holstein, which the two of them had conquered from Denmark and agreed to jointly occupy at the end of the Second Schleswig War in 1864. When Austria brought the dispute before the German Diet and also decided to convene the Diet of Holstein, Prussia declared that the Gastein Convention had thereby been nullified and invaded Holstein. When the German Diet responded by voting for a partial mobilization against Prussia, Bismarck claimed that the German Confederation was ended. Crown Prince Frederick "was the only member of the Prussian Crown Council to uphold the rights of the Duke of Augustenburg and oppose the idea of a war with Austria which he described as "fratricide"". Although he supported unification and the restoration of the medieval empire, "Fritz could not accept that war was the right way to unite Germany."
Austrian Empire
The latter period of Napoleonic Wars featured Metternich exerting a large degree of influence over foreign policy in the Austrian Empire, a matter nominally decided by the Emperor. Metternich initially supported an alliance with France, arranging the marriage between Napoleon and the Francis II's daughter, Marie-Louise; however, by the 1812 campaign, he had realised the inevitability of Napoleon's downfall and took Austria to war against France. Metternich's influence at the Congress of Vienna was remarkable, and he became not only the premier statesman in Europe but the virtual ruler of the Empire until 1848—the Year of Revolutions—and the rise of liberalism equated to his political downfall. The result was that the Austrian Empire was seen as one of the great powers after 1815, but also as a reactionary force and an obstacle to national aspirations in Italy and Germany.