Day of Empire_ How Hyperpowers Rise to Global Dominance--And Why They Fall - Amy Chua [59]
At the same time, Genghis Khan eagerly recruited men with skills and technological expertise the Mongols themselves lacked. After every battle, the Mongols carefully examined their captives and impressed any engineers found. At the same time, they offered generous rewards to engineers who voluntarily defected. In these ways, Genghis Khan brought into his service numerous Chinese engineers who knew how to construct powerful siege engines— portable towers, arrow-spraying ballistas, flame-hurling catapults, fire lances, trebuchets, explosives—that could bring down seemingly inviolable walled cities. These weapons became part of the Mongol arsenal, and the Chinese engineers who designed them were incorporated into the Mongol army. With each new victory, the Mongol war machinery grew more sophisticated and deadlier.18
Even so, conquering the heavily garrisoned Jurchen kingdom was no small feat. To make matters worse, northern China's hot, muggy summers were almost unbearable for the Mongols, who repeatedly fell ill in the densely populated urban areas. It took Genghis Khan's men many campaigns over a period of three years before they finally, in 1214, surrounded the imperial city of Zhongdu. Rather than fight the Mongols, the besieged Jurchen emperor agreed to a settlement proposed by Genghis Khan. In exchange for the Mongols’ withdrawing, the Jurchens would acknowledge the supreme rule of Genghis Khan. As “gifts” of appeasement, the Jurchen emperor presented Genghis Khan with large quantities of gold, silver, and silk, three thousand horses, five hundred youths, five hundred slave girls, and the hand of a Jurchen princess in marriage.19
Genghis Khan kept his end of the bargain. He and his men headed back to the Mongolian steppe. As with the Uighur, Tangut, and Khitan kingdoms, he left the Jurchens with great autonomy, as long as they acknowledged their vassal status and continued to pay tribute. The truth was that the Mongols had neither the interest nor the wherewithal to govern the sedentary civilizations they had conquered. However, shortly after the Mongols withdrew, the Jurchen emperor fled south and set up a new court in the city of Kaifeng. Genghis Khan viewed this as an act of betrayal and immediately returned to China. This time, he had Zhongdu sacked, razed, burned, and plundered mercilessly. According to one contemporaneous source, “The bones of the slaughtered rose mountain-high, the earth was fat with human fat and the rotting corpses gave rise to a plague.” According to another, “[S]ixty thousand Chinese maidens flung themselves down from the city walls…rather than fall into the hands of the Mongol soldiery.”20
The conquest of northern China, finally completed in 1215, proved immensely lucrative for the Mongols. Genghis Khan's men returned to the steppe, their crude carts overflowing with some of the most exquisite artisanship then in existence: silk robes alive with embroidered gold peonies, jade