very well stated, however the part about Khan I am not sure about. Were his armies so large?
As such his genius as a general was most likely not responsible for the extent of his conquest as much as military superiority. Although he was a master of the psychology of warfare, and his greatest attack was upon the populations willingness to resist.
“They say that I am the scourge of God, a punishment sent for your sins. I tell you that this is most certainly true. You may ask what sins you have committed, and I tell you that they must have been grievous indeed if God sent ME against you!”