Answer:
Mongol Invasions
Explanation:
Led by Genghis Khan and his sons, the Mongols briefly ruled most of Russia, Eastern Europe, Asia and the Middle East. Stories of the Mongol invasions horrified Europe. The Mongols expanded their empire using speedy and crucial attacks with an armed and disciplined army. Mongol was known as the best horseback fighter in their time. They cleared out the inhabitants of entire towns that opposed-as was their policy-exterminating some areas and seizing the crops and cattle from others.