The player can take control of American, British, Russian, or German forces to play out battles that are set in World War II. The game is primarily a strategy game, but the player can take control of his or her forces and direct them with the keyboard and mouse for additional depth of control.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam