that failed miserably. Soon after, the government ordered soldiers to go to the front, reneging on a promise. The soldiers refused to follow the new orders. The arrival of radical Kronstadt sailors – who had tried and executed many officers, including one admiral – further fueled the growing revolutionary atmosphere. Sailors and soldiers, along with Petrograd workers, took to the streets in violent protest, calling for "all power to the Soviets". The revolt, however, was disowned by Lenin and the Bolshevik leaders and dissipated within a few days. In the aftermath, Lenin fled to Finland under threat of arrest while Trotsky, among other prominent Bolsheviks, was arrested. The July Days confirmed the popularity of the anti-war, radical Bolsheviks, but their unpreparedness at the moment of revolt was an embarrassing gaffe that lost them support among their main constituent groups: soldiers and workers. The Bolshevik failure in the July Days proved temporary. The Bolsheviks had undergone a spectacular growth in membership. Whereas, in February 1917, the Bolsheviks were limited to only 24,000 members, by September 1917 there were 200,000 members of the Bolshevik faction. Previously, the Bolsheviks had been in the minority in the two leading cities of Russia—St. Petersburg and Moscow behind the Mensheviks and the Socialist Revolutionaries, by September the Bolsheviks were in the majority in both cities. Furthermore, the Bolshevik-controlled Moscow Regional Bureau of the Party also controlled the Party organizations of the 13 provinces around Moscow. These 13 provinces held 37% of Russia's population and 20% of the membership of the Bolshevik faction. In August, poor and misleading communication led General Lavr Kornilov, the recently appointed Supreme Commander of Russian military forces, to believe that the Petrograd government had already been captured by radicals, or was in serious danger thereof. In response, he ordered troops to Petrograd to pacify the city. To secure his position, Kerensky had to ask for Bolshevik assistance. He also sought help from the Petrograd Soviet, which called upon armed Red Guards to "defend the revolution". The Kornilov Affair failed largely due to the efforts of the Bolsheviks, whose influence over railroad and telegraph workers proved vital in stopping the movement of troops. With his coup failing, Kornilov surrendered and was relieved of his position. The Bolsheviks' role in stopping the attempted coup further strengthened their position. In early September, the Petrograd Soviet freed all jailed Bolsheviks and Trotsky became chairman of the