 Complete the following phrase:  War broke out in July 1914. The decision by the party leadership, citing defense of the fatherland, to implement what amounted to a parliamentary truce Burgfriedenspolitik on votes involving funding for the war was contentious within the party from the outset. An antiwar group quickly emerged in the Württemberg SPD with Clara Zetkin, Fritz Westmeyer and the Thalheimer siblings at its heart. They quickly linked up with the partys pacifist group at a national level, becoming known as the International Group, and headed up by Karl Liebknecht and their friend Rosa Luxemburg. In 1915 Bertha Thalheimer was a co-founder of the anti-war Spartacus League, and was one of the organisers of its launch conference held in Berlin in January 1916. In September 1915, together with Ernst Meyer, she represented the league at the Zimmerwald Conference, an international conference of socialist pacifists held near Bern in Switzerland. She also represented the Spartacus League six months later at the follow-up 