With Genghis Khan’s decision to cross the Gobi and invade the Jurched in 1211, he had begun not just another Chinese border war: He had lit a conflagration that would eventually consume the world. No one, not even Genghis Khan, could have seen what was coming. He showed no sign of any global ambitions inasmuch as he fought only one war at a time, and for him the time had come to fight the Jurched. But starting from the Jurched campaign, the well-trained and tightly organized Mongol army would charge out of its highland home and overrun everything from the Indus River to the Danube, from the
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