Great, I like it a lot. Maybe you should make it so that the Russians on one side are preparing to cross the river (which you could make the River Volga) to reinforce their units on the other side. Just like in the real battle (look it up if you like).
I love the Stalingrad, but i think you should make it bigger! I mean like the buildings the Germans with mg42's, Kar98k's, and Mp40's! With the Russians having PpSH and other Russian weapons! BUt other then that Awesome!