Respuesta :
It was the (4) Mongols who used the stirrup, skilled horsemanship, and siege warfare techniques to conquer much of Asia and part of Europe in the 12th and 13th centuries
I believe the answer is: 4. Mongols
The Mongols started to rise into its peak when a king named Gengis Khan rose into power. He require his military to learned advanced technique of horsemanship and siege warfare and managed to conquered approximately around 16% of world's territory and about a quarter of world's population. Even until this day, the Mongol Empire is still regarded as the largest empire that ever exist.
