Long time lurker, first time poster.
I am an intermediate-level player-- I understand how to play the game, but I have little knowledge of the "nuts and bolts" behind the engine like many of the posters here.
I am currently playing the Barbarossa 41 scenario as the Germans. It is mid July. In order to save my units for the final push to Moscow, I have been withdrawing spent units to the reconstructed railroad on the Smolensk-Moscow highway. I have noticed two odd things.
First, my units are not recovering supply. For example, I have had several armor units resting for three or four turns, and their supply has not significantly increased. Moreover, on the last turn, I actually think that my resting units lost supply. Second, when I view the supply, the amount of supply in the hexes reduces throughout my turn (i.e. the supply rating on rail hexes is "12" at the beginning of my turn, and "6" or "8" after two or three rounds of attacking.
What am I missing here? I understand that to model this campaign supply is a significant factor, but I can't figure out why my units are not refreshing.