Unit upkeep is the points you need to keep your men (like archers etc) -the converts – alive. I think it’s 200 points to keep one archer alive, so if you have one archer, you need at least 200 points at the end of the round to keep them going, if you have 2 archers then you’ll need four hundred points, 3 archers = 600 points. I think that’s right anyways. And you’re not a dumbass, it doesn’t say anything about it on the game. I’m totally addicted anyway – at least until the next game comes along.