Sacred Haven of Debauchery

It was the most difficult Fortress to capture out of all of them (although there are still a couple left, but I think they will be easier), and also to defend, at least when fighting the Swedes. I spent so much time on it, but in the end, I managed to take it. Maybe I even had to do it twice, and then I barely managed to defend the city, and it's possible that everything would have repeated again, given the balance of power, but then I discovered a bug that made it easier to destroy the enemy army. I don't know exactly when it triggers, but during a successful defense, when the enemy troops start to scatter, you need to immediately attack the fleeing commanders, and in the battle, not only the nearby allies will be on your side, but also the nearby enemies who are trying to escape. This way, you all attack one weakling and kill him, then the next, and so on, until only one enemy and your allies remain, who help you win in a fair fight.
But I was also able to trigger this bug another time when the guys were just running around the city. Considering that it's quite difficult to gather your own troops, the help of strangers turned out to be quite useful in the end.