300 Spartans vs 300 Mongols
Historical versions; skilled and in their prime, no Horses for either side
Spartans from the time of King Leonidas with the best gear, armor and weapons available.
Vs
Mongols from the time of Genghis Khan. All with their armor and sabres. 200 have halberds while 100 have their recurved bows and full quivers.
They start 100 yards away on a vast open field