This is something the AI does that still amazes me, but I randomly thought it would be a helpful tip to share with anyone who does not yet know about it.
AI artillery (catapults, trebs, artillery, etc) can do a lot of damage from within a city, and you can't hit it. The solution is to move a worker two squares away, probably a worker you captured earlier from the enemy. The artillery unit will leap into the middle of your troops to capture the worker, allowing you to easily destroy it (and probably retake the worker), leaving the AI city ungarrisoned for the taking.
A patch to stop AI civs being fooled like that (particularly with ranged and artillery units) would be a worthwhile investment, I reckon!
AI artillery (catapults, trebs, artillery, etc) can do a lot of damage from within a city, and you can't hit it. The solution is to move a worker two squares away, probably a worker you captured earlier from the enemy. The artillery unit will leap into the middle of your troops to capture the worker, allowing you to easily destroy it (and probably retake the worker), leaving the AI city ungarrisoned for the taking.
A patch to stop AI civs being fooled like that (particularly with ranged and artillery units) would be a worthwhile investment, I reckon!