In September–October 1918, the Sixth Army operated on the routes leading from Arkhangelsk to Vologda and the Northern Dvina to Kotlas and Vyatka, preventing the unification of anti-Soviet forces operating in the European North and those under command of Alexander Kolchak in Siberia.
Members of the Revolutionary Military Council include The 6th Army was formed a second time on 19 August 1920.
The army was included in the newly formed Southern Front against General Wrangel.
It also supported the 2nd Cavalry Army in defeating the Zadneprovsky group of Wrangel's forces.
After the end of the hostilities in the Crimea, the 6th Army protected the Black Sea coast and fought against rebels in the Kherson and Odessa provinces.