Zombie Attack: Stalingrad Breakthrough

Nazi demons (literally) are attacking Stalingrad. Kill them all, comrade!  Fast-paced FPS with massive hordes of various monsters.

Story: 
1942. Nazi forces are invading Stalingrad. RKKA reacts to it and sends a lot of infantry troops and tank squads to defend the city. But by an unknown reason all the attempts to retake the city are failing.
Your name is Yuri Komarov. Soviet intelligence had sent you to find out what's going on in Stalingrad.

Game features: 

-Dynamic battles.
-Heap of different locations.
-Brutal soviet weapons
-Dangerously fast gameplay.