Genghis Khan adapted a variety of older methods of communication over shorter distances, such as the use of torches, whistling arrows, smoke, flares, and flags, for even more rapid transmission of information during maneuvers, hunts, and military movements. The herders had earlier developed a complicated system of arm signals that could be used long after individuals had passed out of hearing range, and under Genghis Khan these, too, were built upon to make an ever more elaborate system of rapid and efficient communication for use in battle or troop maneuvers.
