Higher Game
National Socialist
I made the Pact of the Nilhorn and reduced an enemy's city to no defenders when a barbarian unit was on the other side (this wasn't a barbarian civilization). The barbarian unit simply kept going into his empire, ignoring the open city that I was going to seize after he took it. 
Nilhorn seriously needs a human cost reduction if one of its main points is so unreliable. I've never seen a barbarian unit ignore one of my cities like that.

Nilhorn seriously needs a human cost reduction if one of its main points is so unreliable. I've never seen a barbarian unit ignore one of my cities like that.