Well, that does not sound so unreasonable actually... with all those drunk, crazy sailors and all... They starte a brawl here or there and voila - you've got a war on your hands :) However, if the relationships with the attacking AI faction are good, they are likely to sue for peace and apologize for their fleet's actions... sometimes paying with a province or two...

Quote Originally Posted by Wallas
Diplomacy works and keeps alliances together except against AI fleets. For example France started a war with me by landing his diplomat to my shores and by blocking my port at the same time. But in the next turn I was able to make pease and form a new alliance with them. We didn't even have a mutual border. To me it seems that AI can't controll it's fleets properly and he starts war accidentally with them.