I kind of fear that this island will now lack any form of war... not sure if there are any plans in the making though.
Yeah, there are big plans in the making I'm pretty sure. The war against Cathay was setting up the union of the island as the New Arcaean Empire before beginning a new stage of internalised warfare. Or, as I'm betting, the point at which the balkanisation of the Empire will happen.
Edit: Disclaimer; I'm not actually sure what will happen but I'm sure it will be fun.
