Truly one of my favourite and least favourite things is the war banter.
Some of the interactions between the Troop Leader's in regions is absolutely hysterical, and some is completely mental. Not in a terribly good way either.
I've seen friendly and honourable encounters between warring states on the EC, and some dastardly but amazingly written deeds happen. EC has flavourful wars if nothing else.
At least between Perdan/Caligus and the recent war of the Federation vs the Alliance. (to quote the Asenian Courier which I do happen to read) The roleplays and letters sent back and forth in combat zones makes me typically chuckle aloud, which is something in itself.
I don't know much about the interactions between Sirion and SoA, but I can imagine the years of warring would lead to some interesting character developments.