From: a sunny beach nsw
When the mud comes (41) create fortified zones behind the front lines, best behind a river, at the same time don't move your Romanians further..just let them dig in. I also break up
a few german divisions & distribute them in with the Romanians. Your Romanians will break eventually, but the idea is to slow the Russians down. As for the rest, dig in & try not to attack anything during the blizzard, as you will bleed troops.
Suggest you check out some of Pelton's post on winter 41, you don't have to follow them slavishly, but this guy knows the game.
Those are my principles, and if you don't like them... well, I have others.