The new Kaiser Wiliam rapidly soured relations with the British and Russian royal families (despite being closely related to them), becoming their rival and ultimately their enemy. Before and during World War I (1914–1918), Prussia supplied significant numbers of soldiers and sailors in the German military, and Prussian Junkers dominated the higher ranks. In addition, portions of the Eastern Front were fought on Prussian soil. Prussia – along with Germany as a whole – experienced increasing troubles with revolutionaries during the war. The Great War ended by armistice on 11 November 1918.