ロンドン議定書
Denmark fought Prussia and Austria. Like the First Schleswig War (1848–51), it was fought for control of the duchies because of succession disputes concerning the duchies of Holstein and Lauenburg when the Danish king died without an heir acceptable to the German Confederation. Decisive controversy arose due to the passing of the November Constitution, which integrated the Duchy of Schleswig into the Danish kingdom in violation of the London Protocol.