The Donbas-Don operation was a military campaign of the Russian Civil War that lasted from January to February 1918, by forces of the Southern Revolutionary Front under the command of Vladimir Antonov-Ovseyenko, against the Cossack troops of Alexey Kaledin and Volunteer detachments on the territory of the Donbas and the Don Cossack region. It was the decisive operation in the complete conquest of Russia by the Bolsheviks following the October Revolution.