The Treaty of London in 1852 had maintained the union of Holstein with Denmark, but did not put a definite end to the demands of the Germans, who held that it was a constituent part of Germany. The quarrel was renewed in 1855 over a common constitution given by King Frederick VII to all his states. This was abolished in 1858, and afterwards the Danes sought to grant complete autonomy to the duchies of Schleswig and Lauenburg, this movement being with the purpose of making more complete the union of Schleswig with their country. This step, taken in 1863, led to a protest from the German diet. In all this there was food for an indefinite contest, for, on the one hand, Schleswig did not form a part of the Confederation, but, on the other, certain historical bonds attached it to Holstein, and its population was mixed. The death of Frederick VII (November 15, 1863), who was succeeded by a distant relative, Christian IX, further complicated the quarrel. The duke of Augustenburg claimed the three duchies, though he had previously renounced them. The German diet, on its part, wanted the Danish constitution abolished in Schleswig. The dream of the petty German states hostile to Prussia, and especially of the Saxon minister, Von Beust, was to strengthen their party by the creating of a new duchy. Bismarck admirably outplayed everybody. He knew that the great Powers were at odds with one another over Poland. He, on the contrary, could count on Russia’s friendship and the personal aid of Queen Victoria, whom Prince Albert had completely won over to pro-German ideas. He used England to make Christian IX consent to the occupation of Holstein, which, he said, was in reality an acknowledgment of that king’s rights. At this stage, had the Danes yielded to the necessities of the situation and withdrawn from Schleswig under protest, the European Powers would probably have intervened and a congress would have restored Schleswig to the Danish realm. Bismarck prevented this by a cunning stratagem, making the Copenhagen government believe that Great Britain had taken a step hostile to that government. There was no truth in this, but it succeeded in inducing Denmark to remain defiant. As a consequence, on the 1st of February 1864, the combined forces of Prussia and Austria crossed the Eider and invaded the province. It was a movement to regain to Germany a section held to be non-Danish in population and retained by Denmark against the traditions and will of its people. Austria, which did not wish to appear less German than Prussia, though the matter did not directly appeal to that country, joined in the movement, being drawn into it by Bismarck’s shrewd policy.