After the revolution the Bolsheviks swept through Russia nearly unopposed. The republic had collapsed after the Soviets were given all political power, leaving no solid resistance to the Reds. In May 1918, the Czechoslovak Legion in Russia revolted in Siberia. In reaction, the Allies began an intervention in Northern Russia and Siberia. That, combined with the creation of the Provisional All-Russian Government, saw the reduction of the Bolsheviks to most of European Russia and parts of Central Asia. In November, Alexander Kolchak launched a coup to take control of the Russian State, establishing a "de facto" military dictatorship.