https://store.steampowered.com/app/218090/Unity_of_Command_Stalingrad_Campaign/

Unity of Command is an innovative and refreshing operational-level wargame that covers the entire 1942/43 Stalingrad Campaign on the Eastern Front.
Playable from both the Axis and Soviet perspective, it strives to recreate the strategy, the forces involved and the general tension of that crucial period in World War II.

Experience the highly fluid, enormously large battles of maneuver in a turn-based strategy setting.
Take command in this mobile, back-and-forth sort of war where logistics and poor weather are often the decider, and defeat and victory are sometimes just a mile, or a day, apart.

Activating the steam key

1) You must download and install Steam http://steampowered.com/download/SteamInstall.msi (if not already installed).
2) Create a new account on Steam or go to an existing one.
3) Select "Activate via Steam ..." in the "My Games" section, and enter the key received after payment.
4) After activation, the game will appear in your list of games and you can install it.

Please leave feedback after successful activation of the game.