Kazan Operation

Kazan Operation was the Red Army's offensive (5–10 September 1918) against the Czechoslovak Legion and the People Army of Komuch during the Russian Civil War.
Background.
Following the capture of Samara by the Czech Legion on 8 June, several members of the Constituent Assembly, which had been dissolved by the Bolsheviks, organized a Committee of Members of the Constituent Assembly (in Russian "Constituent Assembly" was "Uchreditel'noe Sobranie", hence the abbreviation for Committee was "Komuch"). This threatened to form an alternative socialist government to the Bolshevik regime.
In August 1918, the Whites occupied Kazan. Bolshevik forces were defeated, and they dispersed to Kazan's neighborhood. The Whites killed the remaining of Bolsheviks in the city, including Mullanur Waxitov.
At the beginning of the operation, the Reds' disposition was as follows: To the west of Kazan were the Fifth Army of the Eastern Front under Pēteris Slavens and the Volga Flotilla under Fyodor Raskolnikov; to the east of Kazan was the Arsk group of the Second Army under Woldemar Azin. They opposed the Czechoslovak legion and KomUch People's Army under A. P. Stepanov.
The battle.
On September 7, the Right Bank Group of the Fifth Army with the flotilla's backing reached the right (west) bank of Volga and shelled Kazan from the commanding position of Uslan Hill. The Left Bank Group reached the mouth of the Kazanka River. That day the Arsk Group took Kinderle and Klyki villages to the east of Kazan. On September 9, sailors and landed marksmen under Nikolay Markin took the beachhead at the western part of Kazan. On that day the Left Bank Group and Arsk Group joined and laid siege to part of Kazan. On September 10, after storming the city from three directions, Red Army troops took control of Kazan.
The majority of Whites managed to sail away via the Volga.
Aftermath.
The capturing of Kazan and Simbirsk by the Red Army made continued strategic offensives westwards possible for the Red Army.