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."
Reichskrieg
During the First Silesian War (1740–42), the Emperor Charles VII had sought a "Reichsexekution" against Prussia, but the diet refused. The war over Silesia was regarded as a dynastic conflict between Prussia and Austria in which the empire itself should not intervene. During his brief reign, the Emperor Charles VII (1742–45) sought a declaration of "Reichskrieg" against Austria, although the latter had not breached imperial law and there was therefore no justification. The pro-Austrian elector of Mainz, Johann Friedrich Karl von Ostein, tabled a formal protest in the Imperial Diet on 23 September 1743 alleging that the election of Charles VII had been irregular. In such a situation, there was no chance of the diet agreeing to the emperor's proposal for a "Reichskrieg" against Austria. The Second Silesian War (1744–45) thus also went by without any imperial action. The Third Silesian War (1756–63), however, became wrapped in a global war of great power politics, the Seven Years' War, and Prussia could not escape an imperial action.