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I finished the first map. I just didn't check what would happen if your city is occupied for more than a week... Once, at the very end of the game, I captured an enemy city (but I didn't really focus on defending my own).
Otherwise... there are a lot of troops... and more keep joining... I sent the excess troops to the city.
In principle, it's enough to have archers and dendroids to defeat everyone... (you can also recruit dragons at the outpost and add archangels to your army).
P.S. I hope that in the future, all 4 maps will be combined into a campaign... and the hero's skills, upgrades, and some artifacts will carry over to the next mission.