My husband and I are both avid Civ players and have noticed that sometimes an overrun that should happen doesn't. The strategy guide, and posts here, say that an overrun should happen at 7-1 (we had actually thought it was 8-1, based on our experience, but I guess we were wrong). But we've both experienced times when we defeated an enemy by an even greater margin, but there was no overrun. For example, I'm sitting here watching my husband play. He just had a veteran warrior army (4.5 attack) attack a barbarian village (0.5 defense). With a 9-1 margin, that should have been an overrun, but it wasn't. What's up with that?