Dunno man, there's no suck thing in "calm before the storm"
Between WW1 and 2, there were some crazy wars/events
Before WW2, we had USSR killing Ukrainians, Spanish civil war,and Germany black mailing other countries, and Japan conflict between their empire and china's empire (alright, no need to say everything "history teacher")
Using this example, a thing we can say, it's that it never has a calm before the storm, there is a fake sensation o peace, the two kingdoms were doomed to be in war the exact moment they made a forced peace agreement. Every bullshit that happened during this peace, was just a fuel to a worst war.
Sadly, the game didn't explored this very well (principally because the war didn't even happened yet)