Hi
In BOA winter weather effect was factored at the end of the turn, so that you can move an army in winter through bad weather and still don´t suffer any attrition as long as you end the turn in a friendly city, that is the case even if the "friendly" city has been taken that same turn. The net effect is that armies still move very freely in winter, there is little incentive for taking winter quarters, will that be address some way different in the ACW game?