@Cyclone Yeah, it's some form of medieval France, with a heavy focus on religiousness and noble values. Guess it's sorta similar to England too. I just chose France as a motto language because.. well, it just sounds better. Forested sounds about right, and given it's south of Driftmark, it makes sense for there to be some swamps. These swamps would naturally be the very first barrier against the Khargits (Khergits from WB?)
Perhaps it even became the site of the crushing defeat -- knights aren't very strong opponents against light archers with horse archers mixed. They're just too slow. So naturally the Khargits would drive back the small amount of forces Dieuporteille sent, before the Dieuporteillean forces retreated to their keeps. I assume Khargits weren't interested in actually sieging out castles, and just satisfied themselves with the villages. But I guess since this is sorta French, villagers would mostly be inside the castle keeps as was custom back then, so slavery was mostly prevented.
When the Khargits were going back home to celebrate, the Dieuporteillean forces might've given chase and hounded them into the swamps, which would be where they struck, since in the swamps it doesn't matter whether you're on a horse with light armor, or on one with fast armor. Plus, Dieuporteille would also field dismounted knights, like Bastien is. So they had an edge in these swamps.
Since then Dieuporteille has indeed been in a rivalry with the Khargits, and was involved in their subjugation.
However now I guess since we've been in 1 empire for some time, the Dieuporteillean guys just have a problem with these Khargits due to their religion. They've been allies for so long in any conflict that really there's no worry about ransacking and pillaging anymore.
Regarding the expansion -- yes, true, this would implicate things for Dieuporteille, but then again I'm not sure if they care. They're pious knights, not farmers, for the most part. Their wealth comes from self sustenance and pilgrims that visit them. Warfare isn't really a destabilizing factor. So that can go either two ways and it'd really depend on the IC
I feel like,which would be either;
a) The Dieuporteilleans make an agreement with the Khargits, and support them in their conquests. Dieuporteille gains claims to the lands that are conquered that border Dieuporteille, where as the Khargits gain the right to 70% of the loot of any city that is conquered together with the Dieuporteilleans (because the Dieuporteilleans would likely supply siege equipment). Slaves will be split to the same ratio (Dieuporteille would likely call them
serfs and not slaves, but you get the point). Possibly an inclusive thing would be the request for the Cossacks to leave any churches intact, and similarily, for the Cossacks to possibly convert.
b) They absolutely still resent each other, probably depending on how the two ambassadors interact. In which case, Dieuporteille would only fight if the king orders it, and they would do so begrudgingly. They'd probably argue with the Khargits over literally everything (you can't have the loot, you can't take slaves, leave this church intact or we'll execute you for heresy, etc) and they'd probably end up dealing blows to eachother.
I can't say which way it'll go but both will be interesting.