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."
Wenzel Anton, Prince of Kaunitz-Rietberg
Thus began the Seven Years' War in Europe, which ultimately failed to bring the lost provinces back to Austria. On 29 August 1756, King Frederick's Prussian Army invaded the Electorate of Saxony in a preemptive strike; they rolled over the Saxon forces and occupied Dresden. While the Austrian allies were not able to reach agreement on joint action, the politico-military situation remained inconlusive. Kaunitz urged for the replacement of the hesitant field marshal Count Leopold Joseph von Daun by Ernst Gideon von Laudon, however, a decisive victory was not achieved.