A player can move some units, attack, move others, attack, and so on. It also means the Germans can try a few local counter-attacks and still get out of the way with other units if things go south. Unit sizes range from divisions to battalions. Most Soviet infantry units are divisions, most German infantry units are regiments. HQ's range from Fronts and Army Groups down to Corps.
Time scale is two days per turn.
Map scale is ten miles to the hex. Only one stack can attack at a time, which is unnecessarily restrictive. One thing that bugged me was that the game only lets you attack with one stack at a time. This forces the Soviet player to collect all his best units in one super stack to attack a particularly stubborn group of defenders. I don't see any military reason for this, and it seems to only be an artifact of the rules.