Genghis Khan manufactured the atrocity stories told about him, deliberately releasing refugees to carry terror to the next city before his army got there.

And when he conquered a city, he always made sure there are plenty of refugees to go to the next city because it's going to weaken them. It's going to weaken their food supply, and they're going to terrorize the people with tales of the millions of people that the Mongols killed with their steel chisel teeth and eating children and all kinds of horrible tales. Genghis Khan encouraged it.