I'm about halfway done with my sheet. I'd be glad to write some history with you, perhaps there was a war between our nations sometime between 100-300 years ago?

My soldiers are supposed to be considered devious by foreigners, and I'd like to have a historical explanation for that. I haven't written about specific locations yet, but I was going to have the ruins of a fifth city to the northwest of the current border, and a bunch of fortifications guarding the current border. A particularly bloody war sometime in the far past could explain all of these things.