FALL BACK!!
And KEEP FALLING BACK!
Seriously, make the German pay dearly to chew through all your infantry by keeping it fighting at the full 2-or-less dice strength. Counterattack only where you can savage his tanks or have a huge numerical advantage. Be very stingy with using your own armor – you’ll need it for the final counterattacks around Moscow.
Above all, get your Allies to send in air power that you can convert to Red ftrs & bmrs. Even if they retain ownership, the Brits can help by parking their ftrs where they can bolster your defense.
SOMETIMES – maybe – a German player will leave a big hole in his front line. You can cause trouble & distract him by rushing in some units. But keep it simple, keep it infantry, and MAKE HIM PAY!!
Also: keep your AA mobile, as you can wear down his air force here and there.
If all else fails, spike his sauerkraut with rancid cabbage!!