The "Luftwaffe" committed "Luftflotte 4" to the invasion. Included in its strength were KG 2 and KG 3, the only "Kampfgruppe" in a force of seven equipped with the Do 17. Among the German "Kampfgruppen", some 110 Do 17s were committed. The first attacks on Belgrade were undertaken at 0651 in the morning of the 6 April. Among the German bombers were 102 Do 17s, carrying 18 SC 50 kg (110 lb) fragmentation bombs, and 2 AB 36 cluster bombs. Some 82 Do 17s remained operational after the first day, with only one reported loss, a KG 3 machine, WNr 2563 5K+DS. The "Luftwaffe" and its Dorniers would find the situation similar over Greece, with little aerial opposition. took part in the Battle of Crete. I./KG 2 lost six Do 17s and seven damaged between 6 April and 31 May. III./KG 2 reported six losses and five damaged in the same period. III./KG 3 also participated in the assaults on Greece and Crete.