Advancing in tandem with the Southeastern Front from November, the Southern Front fought in the Kharkov operation between 24 November and 12 December, capturing Stary Oskol, Novy Oskol, Sumy, Biryuch, Volchansk, Valuyki, Kupyansk, Belgorod, Kharkov, and Pavlovsk. In the Donbass operation, it crossed the Seversky Donets, capturing Izyum, Slavyansk, Bakhmut, Debaltsevo, Gorlovka, Ilovaysk, Konstantinovka, Lugansk, and Mariupol. The front pushed the Armed Forces of South Russia back to the Black Sea and North Caucasus by early 1920, and moved its headquarters forward to Kursk in early January. Its troops inflicted heavy losses on the Armed Forces of South Russia, and fought in the Rostov–Novocherkassk Operation between 3 and 10 January, capturing Taganrog, Novocherkassk, Rostov-on-Don, and Tikhoretsk, reaching the Sea of Azov. It was redesignated as the Southwestern Front on 10 January 1920, with the 1st Cavalry and 8th Armies transferred to the Southeastern Front, and the 12th, 13th, and 14th Armies remaining with the Southwestern Front.