 Complete the following phrase:  The two groups fought in the successful early phase of the battle. On 20 October 1941, I.ZG 26 was ordered to return to Germany and was renamed II.NJG 1 leaving II.ZG 26 and SKG 210 the only Bf 110 units in the Soviet Union. Days later, Luftflotte 2 was ordered to transfer to southern Europe and support the 