AI *is* an idiot, period. Particular band of heroes for the motherland cut the supply lifeline of 2nd, 3rd and 4th panzer armies preparing to assault Moscow. I had incredible stroke of luck in the form of 3 turns of mud which allowed re-estabilishing supply and restoring all of the panzer corps.
In the brief "snow" season after rains, my first attempt to encircle Moscow failed. Next turn, AI PULLS OFF TROOPS FROM MOSCOW SUBURBS!!!
That was SO stupid. I was poised to repeat historical failure of German assault due to impending shitty weather in December when the stupid SOB hands me Moscow on a platter.
Well, it took 6 panzer corps' 3 turns to eject the guys from Moscow downtown but even so..
Now it's all over but for the screaming.. I pulled Finnish Karelian army to hold the line near Moscow. They must have been promised annexation of St Petersburg :p
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Anyways, the air-to-air model is broken.. Even when your escorts outnumber the interceptors 2-to-1, they'll easily inflict parity on losses. Even with obviously superior experience on German side.
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Mountain Corps suffers from huge supply penalty even if they do not get "extra" blizzard penalty .. Feature or a bug?
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When the blizzard-issues get fixed, maybe someone would like to take charge of the people's army

 
					 
					 ), mountain divisions, in addition to advantages for being in mountains, do not suffer when moving in blizzard, and suffer less of a readiness penalty than other units in blizzard, so they aren't immune to the '41 blizzard.  A quick test with some mntn divs in a clear hex in blizzard weather shows them having a readiness of 20-30% better than other units.  They never got close to 20% readiness, so your units were either/or in a poorly supplied square, or were already very low on readiness just before the blizzard turns started.
), mountain divisions, in addition to advantages for being in mountains, do not suffer when moving in blizzard, and suffer less of a readiness penalty than other units in blizzard, so they aren't immune to the '41 blizzard.  A quick test with some mntn divs in a clear hex in blizzard weather shows them having a readiness of 20-30% better than other units.  They never got close to 20% readiness, so your units were either/or in a poorly supplied square, or were already very low on readiness just before the blizzard turns started.