The Russian Revolution occurred from February to October 1917 and resulted in the Bolshevik victory. In February, Tsar Nicholas II was forced to abdicate and a provisional government took over. In October, the Bolsheviks, led by Vladimir Lenin, seized power in the October Revolution. A civil war then broke out between the Bolshevik Red Army and anti-Bolshevik White forces, which the Bolsheviks ultimately won, allowing the Soviet Union to be established in 1922.