Millions died on the Eastern Front of World War I, and the vast Russian army shattered under the German juggernaut.  The economy collapsed under the loss of so many young people, and bloody protests forced the Czar to abdicate.  The Russian Social Democratic Party soon took power, initiating the long Russian Civil War that would end the Empire entirely.  It was merely one of many empires that would die in the crucible of The Great War and the aftermath.