Frederick fought in the wars against Denmark, Austria and France. Although he had opposed military action in each case, once war had started he supported the Prussian military wholeheartedly and took positions of command. Since he had no political influence at all, these were opportunities to prove himself. Frederick experienced his first combat in the Second Schleswig War. Appointed to supervise the supreme German Confederation commander Field Marshal Wrangel and his staff, the Crown Prince tactfully managed disputes between Wrangel and the other officers. The Prussians and their Austrian allies defeated the Danes and conquered the southern part of Jutland, but after the war, they spent two years politicking to assume leadership of the German states. This culminated in the Austro-Prussian War. Frederick "was the only member of the Prussian Crown Council to uphold the rights of the Duke of Augustenberg 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.". However, when war with Austria broke out, he accepted command of one of Prussia's three armies, with General Leonhard Graf von Blumenthal as his chief of staff. The timely arrival of his II Army was crucial to the Prussian victory in 1866 at the decisive Battle of Königgrätz, which won the war for Prussia. Nevertheless, the bloodshed caused him great dismay. A few days before Königgrätz, Frederick had written to his wife, expressing his hope that this would be the last war he would have to fight. On the third day of the battle he wrote to her again: "Who knows whether we may not have to wage a third war in order to keep what we have now won?"