I haven't played since Civ 4 and am struggling with early game barbarians on Prince. They come in waves. I'm not sure what military units I should prioritize right off the bat. I'm playing as the Sumerians. The chariot is great but very expensive. Should I have a mix of warriors and slingers, or focus more heavily on slingers? What do you think the best approach is for wiping out barbarian camps early on (< turn 50 or sooner)? And overall I'm going scout-builder-military-military should I be going a different direction?