The Russian Civil War began in 1917 following the October Revolution and lasted until 1922. It pitted the Bolshevik Red Army against various anti-Bolshevik White armies. While most fighting ended by 1920, it took the Bolsheviks until 1922 to fully defeat all opposition. The civil war was further complicated by foreign intervention from Allied powers in parts of Russia. By the end, around 15 million people had died and the Russian economy was devastated.