Refitted with the new KV-85 the heavy tank regiment took part of the 101st Corps during the Christmas assault west of Kiev. The Germans had assaulted the Soviet positions just days before but were caught off guard by the renewed Soviet Offensive. The 101st Corps threw the Germans back and advanced towards Zhitomir. Parts of 8th and 19th Panzerdivisions counterattacked once more but 12th Guards intercepted and broke the German stroke. 101st Corps would take Berdichev a few days later for which it was to receive a unit citation.
