Also prevents anyone from building a big enough army to attack anyone that has full forts
Probably the biggest army you could hold in one city without NPC farming would be at max a 200k negative upkeep. With 10 cities, you probably wouldn't even have enough food to consolidate the whole thing and send it out as one unit.
And then you'd be selling all your lumber and iron to pay for food and you wouldn't be able to build any more troops.



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