The Whites were defeated at the Siege of Perekop in November 1920, losing the highly strategic Perekop Isthmus and leaving Crimea vulnerable to Red invasion. Wrangel ordered the evacuation of Crimea, effectively ending his government and the Southern Front in Red Victory. South Russia ceased to exist after the Red conquest of Crimea, and its territory was absorbed by Soviet Russia, the Ukrainian Soviet Socialist Republic, and the Black Army.