Concomitant
Recruit
The idea is quite simple, but hopefully it will quell some of the more tedious aspects of army management, such as food rations.
Army supply caravans. These are recruitable/purchaseable (expensive per day) caravans which the player/AI army can get at any city. Ideally a huge army should have 2-3 of these caravans, and they essentially just bring food which must then be purchased from the caravan. This, or the player can order what they want the caravan to bring (and some logic gives an ETA of how long that might take with some fluff of course). These caravans are targetable with unique names such as "Supply Caravan," so it is possible to disrupt enemy supply chains.
Army supply caravans. These are recruitable/purchaseable (expensive per day) caravans which the player/AI army can get at any city. Ideally a huge army should have 2-3 of these caravans, and they essentially just bring food which must then be purchased from the caravan. This, or the player can order what they want the caravan to bring (and some logic gives an ETA of how long that might take with some fluff of course). These caravans are targetable with unique names such as "Supply Caravan," so it is possible to disrupt enemy supply chains.