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."
Welf VII
His father inherited the family's estates in Swabia, including the prominent counties of Altdorf and Ravensburg, which he gave to Welf. Welf, however, spent much of his time managing the Italian possessions while his father stayed in Swabia. Both Welfs supported Frederick Barbarossa as king of Germany and the younger Welf (VII) accompanied him on his Italian campaigns, starting in 1154. In 1160, he was made duke of Spoleto by the emperor. Between 1164 and 1166, he participated in the famous feud between his father and Hugh of Tübingen, which the emperor himself resolved. He was a participant in the campaign of 1167, in which malaria devastated the army and forced the emperor back over the Alps. Welf was a victim of the malaria and died at Siena. He was buried in Steingaden Abbey in Bavaria, where his father was also later buried.