I’m guessing they didn’t want to see too many civilian casualties. Perhaps they were cirle around behind the Soviet columns and cut them off.
Better to regroup and fight a guerilla war against them.
I'm guessing they want to shorten their lines. That gives them easier resupply and communications, and more men/machines per mile of "front".
The old rules still apply. Until they don't.
But the only thing that's going to save them is a US air Armada, or at least some outside air support from somewhere. I think they'll be like the guys in the Philippines during the opening days of WW-II, waiting for the Arizona. Only in this case the hardware is still operational, there is just not the will to send it.