 Complete the following phrase:  In July 1864, Charles I succeeded his father William as king and almost at once had to face considerable difficulties. In the competition between Austria and Prussia for supremacy in Germany, William had consistently taken the Austrian side and the new king continued this policy. In 1866, Württemberg took up arms on behalf of Austria in the Austro-Prussian War, but three weeks after the Battle of Königgrätz 3 July 1866, the allies suffered a comprehensive defeat at the 