Initially formed in January 1941, it was serving with the 6th Army, Kiev Special Military District under the command of General Major Andrey Vlasov when the German Operation Barbarossa began in June 1941. On 22 June 1941 4th Mechanised Corps consisted of 28,098 Soldiers and 979 tanks. It initially comprised the 8th and 32nd Tank Divisions, the 81st Mechanised Division, the 3rd Motorcycle Regiment, and other smaller units. It fought in the Battle of Brody, and was destroyed in the Uman Pocket in August 1941 with 6th Army and was disbanded shortly after.