The All-Great Don Army is a republic established in southern Russia by the white government after Cossack units took control of Novocherkassk on May 10, 1918. The official proclamation took place on May 18, 1918, by the Don Salvation Circle in the territory of the Cossack Region of the Don Army, following the overthrow of the Bolshevik government of the Don Soviet Republic. On September 15 of the same year, the Great Don Circle approved this formation. The name for the republic was suggested by Ataman Pyotr Nikolayevich Krasnov, based on the title used in royal messages to the Don in the 17th century: 'to the Atamans and Cossacks and to the entire Great Don Army.' The republic ceased to exist under the pressure of the Red Army in early 1920.