Poster «International», 1919 during World War I

Russian Civil War (1918–1920) conflict in which the Red Army successfully defended the newly formed Bolshevik government led by Vladimir I. Lenin against various Russian and interventionist anti-Bolshevik armies. Russia’s disastrous performance in World War I was one of the primary causes of the Russian Revolution of 1917, which swept aside the Romanov dynasty and installed a government that was eager to end the fighting.