Actually Oligarch was not at war with Nivemus, but it seems they will soon join the fray as well. A first Caligus unit has been spotted also, so I would assume that they will try a siege with Sirion, Caligus, Nivemus, Eponllyn and Shadowdale vs Oligarch City. That'll be one epic scene most likely. Based on army composition I already have a pretty good idea of how it'll prob look like, but don't want to give away too much advise to the enemies of course.
they already declared war.