During World War I, the Central Powers had forced the Imperial Russian troops out of Congress Poland and Galicia, as manifested in the Treaty of Brest-Litovsk on 3 March 1918. Following the military defeat of Austria-Hungary, an independent Polish republic was declared in Western Galicia on 3 November 1918, the same day Austria signed the armistice. The collapse of Imperial Germany's Western Front, and the subsequent withdrawal of her remaining occupation forces after the Armistice of Compiègne on 11 November allowed the republic led by Roman Dmowski and Józef Piłsudski to seize control over the former Congress Polish areas. Also in November, the revolution in Germany forced the Kaiser's abdication and gave way to the establishment of the Weimar Republic. Starting in December, the Polish-Ukrainian War expanded the Polish republic's territory to include Volhynia and parts of Eastern Galicia, while at the same time the German Province of Posen (where even according to the German made 1910 census 61,5% of the population was Polish) was severed by the Greater Poland uprising, which succeeded in attaching most of the province's territory to Poland by January 1919. This led Weimar's Otto Landsberg and Rudolf Breitscheid to call for an armed force to secure Germany's remaining eastern territories (some of which contained significant Polish minorities, primarily on the former Prussian partition territories). The call was answered by the minister of defense Gustav Noske, who decreed support for raising and deploying volunteer "Grenzschutz" forces to secure East Prussia, Silesia and the Netze District.