I don't know if the idea is already in the forum or even in the game . But, if yes, Pieter you can eliminate this thread. So, imagine Portugal is at war with Spain for instance. You are walking in São Jorge and suddenly a bunch of Spanish soldiers appears and attack people and guards. So that you cannot run away all the doors are locked and fast travel disabled. If the people, you and the guards succeed in repealing the attack, everything comes back to the normality. If the enemy kills everybody in the location (and you inclusive) as it already happens you're reloaded in the tavern room with the inconvenient of losing money or even your ship. Seeing all the nation are at war with pirates. A pirate attack can also occurs of course.