German anti-aircraft gunners at the bridge in the occupied city of Kalinin

German anti-aircraft gunners in defensive position at the railway bridge across the Volga in the occupied city of Kalinin (now Tver). Eastern front.
In the foreground of the German anti-aircraft gunnersis the German 37-mm FlaK 37 anti-aircraft gun, below is the “dugout” of gunners.

Location: Kalinin, USSR
Date: 1941