This wretched fiasco was hardly less satisfactory to the majority of Germans than the manner in which the national claims in Schleswig-Holstein were maintained. The armistice of Malmoe having expired in March 1849, the war with Denmark was resumed. A considerable army was despatched against the Danes by the Frankfort government, but on the 10th of July an armistice was signed at Berlin for six months, and a year afterwards Prussia concluded peace. The inhabitants of the duchies, however, continued the war. During the interview at Olmütz between Manteuffel and Schwarzenberg it was agreed that, like the affairs of Hesse-Cassel, those of Schleswig-Holstein should be submitted to the decision of all German states, but that, in the meantime, Prussia and Austria should act together. By the intervention of Austrian troops peace was restored; and when, early in 1852, the government of Denmark, in providing a constitution for the whole monarchy, promised to appoint separate ministers for Schleswig and Holstein, and to do equal justice to the German and the Danish populations, the two powers declared themselves satisfied and the Austrian forces were withdrawn. The diet also, after some delay, professed to be content with this arrangement. While it was discussing the subject, a conference of the European powers met in London, and by the protocol of May 28, 1852, settled that Frederick VII. of Denmark should be succeeded by Christian, duke of Glücksburg, and that the duchies should be indissolubly united to the Danish monarchy. Austria and Prussia accepted the protocol, but it was not signed by the diet. Austria and the Zollverein. In all these later events the first place had been taken by Austria. The temporary dissolution of the Zollverein in 1851 gave her an opportunity of trying to extend her influence; she demanded that a union should be formed of which she should be the leading member. A congress of all German states, with the exception of Prussia and one or two states which sympathized with her, was held in Vienna; and it was followed by several other congresses favourable to Austrian pretensions. Prussia, however, being here on strong ground, refused to give way; and not only was the customs union restored in accordance with her wishes, but Austria concluded with her in 1853 a treaty of commerce which embodied some important concessions. Political reaction.