Each archer had at least one extra horse—there was an average five horses per man—thus the entire army could move with astounding rapidity. Moreover, since horse milk and horse blood were the staples of the Mongolian diet, Genghis' horse-herds functioned not just as his means of movement but as his logistical sustainment. All other necessities would be foraged and plundered. Khan's marauders also brought with them mobile shelters, concubines, butchers, and cooks. Through maneuver and continuous assault, Chinese, Persian, Arab and Eastern European armies could be stressed until they collapsed, and were then annihilated in pursuit and encirclement.