Despite the 1920 treaty of non-aggression signed between Bolshevik Russia and Georgia, Soviet Russia’s 11th Red Army invaded Georgia on February 11 1921, and marched on Tbilisi. Almost simultaneously, 9th (Kuban) Army entered Abkhazia on February 19. Supported by the local pro-Bolshevik guerrillas, the Soviet troops took control of most of Abkhazia in a series of battles from February 23 to March 7, and proceeded into the neighbouring region of Mingrelia.