I believe what [@The 42nd Gecko] is a spot similar to the 'quiet sectors' in the Western Front in WW1. A place where enemies faced off across the trenches, but generally fighting was low intensity and fairly sporadic. This was generally allowed for multiple reasons, on both sides of the border. It was a place where new units could get a taste of combat before being sent to somewhere more active, it allowed units that had been through recent battles a chance to rest and recover before being deployed again, and it allowed for the guys in charge to better concentrate all their resources to the fights that they believed mattered. 

This is in comparison to, say, Ypres, where every day was hellish combat. In such a 'quiet sector', you'd be more likely to have a relationship with the enemy beyond 'shoot on sight', even if it's just leaving cigarettes for the enemy patrol when they come around (Just watch out for the snipers). And since war profiteeering Neutrals aren't a thing, it's the most likely place where regular faction members could interact outside of irregular challenges like the current fight.