I always took them to be a tribe of Easterlngs from around the Sea of Rhun, and used a crude chariot drawn by Wargs and acted as a sort of 'heavy calvary', and was supported by infantry. The Turkish, north African look and stature is what I picture, and they used axes. I guess the best descriptions from Tolkien would be the swarthy men that were spoken of in the Silmarillion.
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