 The Jagdschwarder was operating in the Donetz river valley in support of the German drive towards the Caucus oil fields and Stalingrad during Case Blue.Operating in the east the frequency of air combat was high, with most of the engagements fought at low altitude.In the first two weeks of July Greisert was credited with 8 aircraft shot down, including five Il-2 Sturmovik ground-attack aircraft.