After the personal order of Vladimir Lenin, they sent the best cavalry corps of the Red Army under the leadership of Budyonny against Mamontov's Corps, who succeeded in November 1919 after a very hard and bloody fighting in the Battles of Voronezh, Kastorensk and in the Kharkov operations at the end of 1919. These two offensives were directly connected with the Orel-Kursk operation in 1919 and were part of a broad military action in the Red Army counter-offensive in the southern front. Mamontov’s corps was routed by S. M. Budennyi’s cavalry corps at Kastornaia in November 1919. This defeat was crucial for the consolidation of the Bolshevik power and undermined the morale of the anti-Bolshevik forces. Mamontov was subsequently relieved of his command, but after a few days re-appointed to his post. Mamontov died on 14 February 1920 in Ekaterinodar of typhus.