I think there's a problem with ruins. I'm playing a marathon huge world game on Chieftain difficulty, and in the year 2920 BC, the Greeks have a unit of Riflemen. The only explanation I can think of for this insanity is that they have got very lucky (or benefited from a bug) with ruins upgrades. I saw them wandering around with Pikemen earlier, so this may be the same unit that was upgraded. They'd have to be pretty lucky; I count four upgrades (Warrior -> Spearmen -> Pikemen -> Musketeers -> Riflemen) there, but it may be that pikemen upgrade directly to riflemen. I haven't played that far. So what's up with this? Has anybody else seen it?