My game might be bugged, but all the kingdoms in the land are at peace with each other. After about 3-4 months of this peaceful nonsense, I finally sent my armies into the neighboring kingdom and started capturing land. As a vassal of one kingdom, I was hoping this would be enough to start a war, but that isn't the case. Every month or so I get a message that King Ragnar hasn't responded to Vaegir threats and he loses face with his followers. Eventually, I conquered his entire kingdom by myself because my allies wouldn't help out and he would never start a war. So is there an easier way to make your kingdom go to war? --- Someday, someone will best me. But it won't be today, and it won't be you.
I think wars and peace aren't dependent on our actions (not sure though). But in my game there are new wars and peace every week almost, and it seems kind of random. There were times I was attacking lords from a nation my faction was at war with and they still just made peace with them. There was also new wars starting with nations I didn't even come into contact with yet. Maybe that's because I'm just a mercenary though.
I'm a vassal under Lord Kastor of Veluca. They weren't at war with anyone for weeks, my troops' morale were extremely low to the point of having several deserters due to the peace-time, I took it upon myself to attack a random Nord lord and they declared war on Rhodoks due to provocation. After a few battles my troops' morale skyrocketed and I took over Wercheg. --- ;;
I never found the start a war quest b/c as a vassal, it's nearly impossible to get quests from any of the fellow lords (also might be a possible bug). I was a big surprised that the game acknowledges aggression from my country but never acts on it. --- Someday, someone will best me. But it won't be today, and it won't be you.