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."
Austro-Italian ironclad arms race
Tegetthoff's successor to the office of "Marinekommandant" was his old political rival, Friedrich von Pöck. While he commanded the ship-of-the-line "Kaiser" in the Second Schleswig War, Pöck had been given shore assignments throughout the Seven Weeks War, denying him the same sort of fame and public admiration that Tegetthoff had enjoyed after the Battle of Lissa. Almost immediately after taking office, Pöck faced chronic budgetary problems, owing in large part due to obstructionism from Hungarians and liberal Germans within the Austro-Hungarian government, the former viewing naval matters as an Austrian concern, and the latter opposed to naval expansion in light of the continued deterioration of the Regia Marina following the Battle of Lissa. Additionally, since he was not involved in Tegetthoff's victory at the Battle of Lissa, he lacked the personal prestige to command the respect of the government, which Tegetthoff had successfully used to secure the construction of four ironclads in the four years since the Seven Weeks War. As a result, Pöck had great difficulty securing the funding for new ironclad warships during his tenure.