Political map of Europe & the Mediterranean 25 October 1918 (Collapse of the Central Powers): The Allied (Allies of World War I) advances of August and September were too much for the Central Powers (Central Powers). Bulgaria accepted defeat on September 29, followed by the Ottoman Empire on October 30 (Armistice of Mudros). Meanwhile Polish, Czech, and Hungarian populations began to break away from Austria-Hungary, while Germany negotiated an armistice (Armistice with Germany) with the Americans.