Barkmann served with the regiment during the large-scale operations against the Soviet forces' mobile spearhead under command of Markian Popov and took part in the Third Battle of Kharkov.
Barkmann served with the regiment during the large-scale operations against the Soviet forces' mobile spearhead named after Markian Popov. Promoted to Unterscharführer and given command of a Panzer III, he took part in the Third Battle of Kharkov.