Anaris has posted the details before. It's not a secret.
I guess I fail at reading comprehension then. I thought my understanding of the "who fights on which side" algorithm was rock solid.
Could you (or another Dev) please post it again?
Also, even given that my understanding is obviously wrong, I believe that this is still a bug. What is the point of an alliance if it does not prevent battles from breaking out between allied realms? In the worst case scenario, it should have been Suville troops attacking Taran troops, with everyone else staying neutral. Suville had an alliance with CE but attacked CE forces anyway. That is not intuitive to me.
