Hey, I have some issue with the mod I'm playing then, my army got upkeep cost. This is normal you will say, but the hard part is that an army's don't have any upkeep cost. Sparta, who maintains something like 8-10 full army with elite unit have a treasury of 350k gold when I have issue to maintain 5 full armies without going bankrupt .
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also try this mod:
https://steamcommunity.com/sharedfiles/filedetails/?id=2278413181