Leipzig and instigated by Lasalle. During the Second War of Schleswig Hasenclever was once again drafted into the Prussian army for a short time. Shortly after his release he was sentenced to six weeks in prison on grounds of Ehrfuhrchtsverletzung gegenüber Sr. Majestät (Lèse majesté against the Prussian king Wilhelm I) due to an article he had written for the Rheinische Zeitung. However, he was acquitted on appeal. After these experiences with the Prussian judicial system he joined the ADAV the same year – only a few months after Lasalle had died in a duel. Career in the ADAV, rivalry with the SDAP In 1866 Hasenclever was elected secretary of the ADAV under association president Carl Wilhelm Tölcke. From 1868 to 1870 he was responsible for the party's finances. At the same time, from 1867 to 1869, he ran the tannery in Halver that belonged to his sister. In 1869 Hasenclever became the representative for Duisburg in the Reichstag (parliament) of the North German Confederation, which had been founded in 1876 after Prussia had won the Austro-Prussian War against Austria. After the election he moved to Berlin. The other ADAV representatives were Friedrich Wilhelm Fritzsche and the anti-Prussian, anti-Marxist Johann Baptist von Schweitzer, who had become president of the ADAV the same year. Also present in the Reichstag was the Social Democratic Workers' Party (Sozialdemokratische Arbeiterpartei, SDAP), with Wilhelm Liebknecht and August Bebel. The party, which was revolutionary and Marxist, had been formed 1869 in Eisenach, Kingdom of Saxony, from the left wing of the Saxon People's Party (Sächsische Volkspartei). Contrary to the ADAV, the SAP followed a strict anti-Prussian line and worked towards "Großdeutsche" (greater German) unification including Austria and a federal structure, with the goal of constricting the hegemony of Prussia, which was considered reactionary and militaristic by the SAP. That was not only in conflict with the goals of the conservative Prussian president and chancellor of the North German Confederation, Otto von Bismarck, but also with Schweitzer, the controversial leader of the ADAV, who was closer to the chancellor in national matters than the more internationally-oriented SAP. After the end of his first Reichstag period Hasenclever took part in the Franco-Prussian War of 1870/71. After the victory of the North German Confederation under Prussian leadership, the southern German states Baden, Württemberg and Bavaria joined the Confederation, forming the German Empire with the King of Prussia, Wilhelm I,