I thought I would pop in and add my two cents. I really like the Idea of attrition and logistics. Here is how I see this working: When a unit is outside the sphere of influence for given amount of time his stamina as well as attack points will steadily decrease. Some civs could have an advantage as they were better at living off the land and foraging. Eventually without some sort of replenishment the unit will become inefectual. (A malnurished soldier would have a hard time with descision making, aiming and weilding a heavy sword/spear/shield) To combat this there could be a unit that has its own area of influence that replenishes the unit while within its perimeter, Perhaps a food cart or an encampment. I like the Idea of a cart that unpacks into a camp. The replenishing would cost a certain amount of food. Restocking of the camp could be done virtually or for a bit more logistical complexity would have to be restocked manually, perhaps a trade cart could pull double duty during war time? If this were the case then soldiers could also restock by foraging and stealing from plundered crops using the camp as a dropsite. This would allow for quick raids with no loss of stamina or attack, but be true to the reality that long protracted engagements are costly for the those left back home. I also agree that health should not be affected as the logistics could be sidestepped by bringing along some healers to go around and bring everyone back to health.