Re: upkeep
Food and upkeep are different. Most units need food, which is called "supplies." This is calculated individually for each province. Each province has a number of supplies in it, which might be modified by growth or death scale, the size of the population and where the nearest friendly castle is. Some units don't need supplies (undead and trolls, and some summoned creatures) and some actually produce supplies. If there are more troops than supplies in the province, they starve. Starving units lose morale and get afflictions and diseases.
Upkeep is different. Upkeep is measured in gold, and it is calculated based on your whole empire. Every unit requires upkeep equal to 1/15 of its initial cost, or 1/30 of its cost if it is sacred. Most summoned units don't have any upkeep, but some (including trolls) do have upkeep. Trolls have lots of upkeep.
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