My standard build order is 2x scouts followed by 4x slingers. The scouts explore, and the slingers along with the warrior bust up barbs. Once I kill the first barb with a slinger and get the eureka for archery, they upgrade to archers and roll the two closest neighbors. 4x archers with 2x warriors (upgraded to swordsmen when available) can really wreak some havoc in the early game. I DOW the first enemy in the ancient era and the second not long into the classical era.