Political map of Russia & the former Soviet Union 31 July 1918 (Civil War and the Execution of the Tsar): The Czechoslovak troops (Czechoslovak Legions) seized much of the Trans-Siberian Railway (Trans-Siberian Railway). With their support, anti-Bolshevik factions quickly gained power across Siberia. Simultaneously, disgruntled leftists rose up in Moscow and Yaroslavl (Left SR Uprising), but were crushed after a few days.    Tsar Nicholas II (Nicholas II of Russia) and his family had been moved to the Ural city of Yekaterinburg in April. On July 17, concerned about the approaching Czechoslovaks, the Bolsheviks executed them by firing squad (Shooting of the Romanov family).