Military City States gives a special unit when you have the right tech researched. I believe it's always a unique unit of a civ who's not in the current game.
It's a nice addition of those CS, but in BNW I couldn't make it work. Is it buggy? Have others experienced this too?
It's a nice addition of those CS, but in BNW I couldn't make it work. Is it buggy? Have others experienced this too?