As far as the AI is concerned, there's really no such thing as internal vs external cities. That is a human only feature.
Instead the AI based number of defenders present mostly upon the population of each city.
In addition, the AI places a couple of extra defenders for cities containing wonders.
And a city that is "threatened" : defined as those having enemy offensive units within 2 tiles, get extra defenders. (Drafting if needed.)
By having 3 movement units at range of 3 away from an enemy city, we avoid the AI thinking their city is threatened. The down side is that our 3 MP units usually can't retreat during the attack if they started that far away.
Pompeii is also surronded by forest & sea and so the forest would have to be bombarded first if we wanted to lauch an invasion from 3 tiles away.
Instead the AI based number of defenders present mostly upon the population of each city.
In addition, the AI places a couple of extra defenders for cities containing wonders.
And a city that is "threatened" : defined as those having enemy offensive units within 2 tiles, get extra defenders. (Drafting if needed.)
By having 3 movement units at range of 3 away from an enemy city, we avoid the AI thinking their city is threatened. The down side is that our 3 MP units usually can't retreat during the attack if they started that far away.
Pompeii is also surronded by forest & sea and so the forest would have to be bombarded first if we wanted to lauch an invasion from 3 tiles away.
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