German strategy for first blizzard

[Kuniworth]

Hi, I was wondering about how to face up against the russian counter-offensive. In time we talkin about maybe 17-18 turns of blizzard between dec´41 and march´42. How important is it for the germans to hold their lines except for the first few turns when combat value still is relative high? Wouldn´t be better to stand and fight for 2-3 turns than retreat let´s say 10 hexes(5 turns as soviet armies moves 2 hexes), and then stand and fight again to minimize casualties?

My question is how much ground can the wehrmacht afford to give up, and how much ground(in hexes) will be lost anyway trying to resist?