Portrayed as cruel, savage, bloodthirsty, dressed in rags (if that) with grey skin (to emphasize their inhumanity), and with the main symbols of their warfare being horses and a golden eagle (fighting on horseback was a major component of why the nomadic people of the steppes were able to become such a feared military force, i.e. the Mongols several centuries later, and eagle hunting was a huge part of Mongolian culture)