I think one of the admins would reply with something like this: "There are troops defending these cities, such as local militia and the local garrison, but they are very small, too small to represent in this game. You gotta use your imagination" Also maximising the max unit size would be a pain and having a minimum amount of troops would be unrealistic since you can't do a tactical retreat or push with all you got. Also you wouldn't have an army defending a town in the centre of your nation would you. Btw there is a stack penalty since they move slower the more units you have.
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