The event allows you to pick from 3 options and causes devastation in a province when you finish the siege of a fort. Right now it can fire when we take back rebel controlled or sieged by enemy fort, even if the owner of the province is the player/his ally or even someone neutral (you can unsiege land of you are hostile to occupant). In my game I've caused 75% devastation on my own province and immediately got an event calling the bastards that sacked my land barbarians.
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