Cheat Codes/Bug:
This is a bug I found in the game while playing as a russian in a campain:
Start playing the game and while the computer is playing press the M on you keyboard to get the menu choose file and save (here is the most important, it will not be easy since when the AI is shooting at you you can't act, but when it will start moving its units you will be able to do it-try keeping the mouse left clicced on the file section untill u get the pull down menu).
After saving it hit alt+ctrl+del and close the games application.. you have to do it also a few times here to exit.. and relaunch the game get in your saved campain and start it.. you will get a German player turn BUT YOU will be playing instead of him .. you will be able to move the previously viewed units (try to exauhst there moving points and get closer to you or exposed for you units or make them assault 1 by 1 a group of tanks of yours to get eliminated!! or better get them into a MINE field. When you finish pass the turn and the AI will continue as usual and give you the turn.. and here you'll finish them cruelly since they can't defend without MP..
In this way I got a -700,-1000 for each mission which is promotions..honors and lots of new tanks and units (more playability).