I have seen the AI build forts in 2 situations. The Julii AI often builds a fort to protect Arretium from direction of Mediolanum. The other situation i saw was with a mod I did to weaken the Scipii and help carthage (pre-patch). Both factions ended up building forts opposite each other in sicily and watched each other for about a decade.
Personally, I rarely use them. I prefer offense to defense. But they can be occasionally useful to delay enemy.
@Wishazu
I haven't read that before (forts decrease likelihood of brigands). Are you sure about it? If so, I am definitely gonna build more!
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