Large powerful horses that can carry soldier with full armor isn't bred in this world until late in the Persian Empire from horses obtained from Central Asia. China only got these horses from the Parthian Empire trading with bolts of silk. So it is only until the Han Dynasty were heavy cavalry was possible. Neither did the Huns nor people in the West are able of such heavy cavalry until the large horses were more widespread. In addition to that, it needed the invention of the stirrup to keep the rider stable. So true heavy cavalry becomes possible for China starting at late Han onwards.
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