The Russian Revolutions began with unrest against Tsar Nicholas II's autocratic rule that grew out of Russian losses in the Russo-Japanese War of 1905 and World War I. This led to the February Revolution of 1917 which deposed the Tsar and established a provisional government. However, growing opposition led the Bolsheviks, led by Lenin, to seize power in the October Revolution. This established the Soviet Union and one-party rule by the Communist Party under Lenin's leadership, who faced civil war against opposing forces until the Red Army emerged victorious in 1922.