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."
Wilhelmine of Prussia, Margravine of Brandenburg-Bayreuth
Wilhelmine's brother Frederick granted her an allowance in exchange for troops, following the same procedure with her sisters. With the outbreak of the Seven Years' War, Wilhelmine's interests shifted from dilettantism to diplomacy. Austrian diplomats were trying to influence the court of Bayreuth to take their side against Prussia. In September 1745, during the Silesian war, Wilhelmine met with Maria Theresa of Austria. This almost destroyed her intimate relationship with her brother. In 1750 Wilhelmine visited the Prussian court for several weeks and met famous contemporaries such as Voltaire, Maupertuis and La Mettrie. In June 1754, the siblings met for the last time, after which Frederick swore her his eternal loyalty. She acted as eyes and ears for her brother in southern Germany until her death at Bayreuth on 14 October 1758, the day of Frederick's defeat by the Austrian forces of Leopold Josef Graf Daun at the Battle of Hochkirch. Although Frederick had lost many friends and family to death throughout his life, Wilhelmine's hit him the hardest. He suffered from severe illness for a week following news of Wilhelmine's death and fell into a depression from which he never fully recovered.