Plus, it's really the first time when Unity of Command will throw massive supply issues at you, and not just due to lack of depots. Look at that supply percentage at the top of the screen. It didn't start at 90%, I had to take optional objectives to get it that high. The vast distances of Russia, the loss of supply movement capability, and the lack of infrastructure will make itself felt when even units perfectly inside the supply range get to go hungry for a turn.
