German 88mm Flak Gun during Barbarossa

Positioning of an 8.8 cm Flak gun of the Luftwaffe (German Air Force) at the Eastern Front during Unternehmen Barbarossa, summer 1941. Photographer: Artur Grimm. For the invasion of the Soviet Union, Germany deployed the 8.8 cm Flak in 51 mixed Anti-Aircraft battalions. They were mostly Luftwaffe-subordinated units attached to the Heer at corps or army level, with approximately one battalion per corps. The weapon saw continuous use on the eastern front. The appearance of the outstanding T-34 and the later KV tanks shocked the German panzer crews and anti-tank teams, who could only penetrate the Soviet tanks' armor at extremely close range on the order of 200 yards when using the standard 37 mm and 50 mm guns, while the Russian 76 mm gun was effective out to 1000 yards.

Source :
https://en.wikipedia.org/wiki/8.8_cm_Flak_18/36/37/41
https://photochronograph.ru/2019/04/20/gitlerovskie-vojska-vo-vremya-nastupleniya-v-sssr-1941-43-gody/