1 - I culture bombed Arabia which took my borders to touching their Capital.
2 - I built a Citadel touching their Capital and plonked a warrior inside.
3 - Four turns later their work boat and Spearman were dead.
So it seems that the Citadel prevents healing even in the AI civilizations Capital!
EDIT
Some of you guys might have been aware that we can build a Citadel right next to an AI City, but this is a revelation to me. I might well be planning aggressive tactics around this strategy for future games.
2 - I built a Citadel touching their Capital and plonked a warrior inside.
3 - Four turns later their work boat and Spearman were dead.
So it seems that the Citadel prevents healing even in the AI civilizations Capital!
EDIT
Some of you guys might have been aware that we can build a Citadel right next to an AI City, but this is a revelation to me. I might well be planning aggressive tactics around this strategy for future games.