Final answer:
Genghis Khan used the tactic of spreading stories of his brutality by scouts as a form of psychological warfare to break the will of his enemies and minimize their resistance.
Step-by-step explanation:
The tactic of psychological warfare used by Genghis Khan was to strike terror in his enemies. This was carried out through various means, one of which was using scouts to spread stories of his brutality. These stories served to intimidate and demoralize opposing forces, making them less likely to put up strong resistance. The Mongol armies also employed strategies such as feigning retreats only to ambush pursuers and conducting nighttime assaults that made their numbers appear larger than they actually were. By instilling fear, the Chief aim of the Mongol generals was to break the will of their enemies to resist. However, for cities that surrendered peacefully, they were promised safety and protection in exchange for a tax.