Konstantin Mamontov, was a Russ. mil. commander and famous gen. of the Don Cossacks, who fought for the Whites a.during the Russ. C.W. After the personal order of Lenin, the best cavalry brigade of the Red Army under the leadership of Budyonny against Mamontov Corps, who succeeded in November 1919 after very bloody fighting in the Battle of Voronezh Kastorensk and in the Kharkov operations. The failure of the Forces of South Russia was crucial for the consolidation of the Bolshevik power.