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we need horse archer raiders or nomad people 

Agreed. When diplomacy gets added I plan to diversify the enemy AI, and include a lot of human AI as well. Steppe nomads would  be a great fit, especially for the Mesopotamia map type.

I'm not sure nomads would work well as a playable race, though. Bronze Age relies on the city-building aspect for its core game play, and nomads tend to have small, temporary settlements.