The wing was sent north to assist with a powerful Soviet spring offensive around Izyum and Kharkov, which became known as the Second Battle of Kharkov. First and second group were based at Konstantinovk, and were immediately engaged against Soviet motorised and armoured forces. Second group lost three Hs 129s on 23 May—a severe blow to the recently established group. Another sources suggests four fell this day, but the group still made successful attacks. The base at Konstantinovka was bombed by 7 GShAP of the 4th Air Army but second group's Hs 129s were not seriously damaged and reported no loss—their rugged construction helped. The battle ended on 28 May. During the month the wing flew 1,467 sorties; 1,028 Bf 109 missions, 259 by the Hs 123s and 180 by the Hs 129s.