How come the Mongol mounted archer armies was so effective against the West when thousand years before the Huns and Byzantines used chiefly mounted archer as well?: history

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How come the Mongol mounted archer armies was so effective against the West when thousand years before the Huns and Byzantines used chiefly mounted archer as well?: history
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4/11/15, 3:05 AM
Citation
How come the Mongol mounted archer armies was so effective against the West when thousand years before the Huns and Byzantines used chiefly mounted archer as well?: history. (n.d.). Retrieved April 11, 2015, from http://www.reddit.com/r/history/comments/324oxj/how_come_the_mongol_mounted_archer_armies_was_so/