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Hmm, I'm not sure. Harpies are weak and can be easily defeated, and their damage is very low... Nomads are still better, and they are easier to build. I think a Citadel is needed for Harpies, while a Caravan is needed for Nomads...
You'll have to spend more, of course... it's more expensive, but Harpies are more likely to survive ;) and Nomads are always on the front lines...