I recently had the chance to complete the "Barracks" project upgrade to a School, but one of the requirements is that the village has to have won at least one war. I tried to increase its greed (it even had a war marker for a little bit), but it didn't wage war on its tiny neighbor (~50 prosperity vs. ~200). How do war markers work? How can I push a village to wage war, and how can I prevent a village from waging a war?
What are the mechanics of war?