Much like how the Parthian Empire’s army is known for its mounted archers, what the the famous and most skilled and deadly units of the militaries of: 1. The Roman Empire 2. The Kingdom of Kush 3. The Kingdom of Aksum 4. The Kushan Empire 5. The Satavahana Dynasty 6. The Saka Western Satraps 7. The Han Dynasty of China 8. Xiongnu 9. Teotihuacan 10. The Maya 11. The Zapotec 12. The Mixtec 13. The Germanic tribes 14. The Mongols 15. The Turks (All of this being around 100 AD)