Genghis Khan saw the potential advantage in Khwarezmia as a commercial trading partner using the Silk Road, and he initially sent a 500-man caravan to establish official trade ties with the empire. However, Inalchuq, the governor of the Khwarezmian city of Otrar, attacked the caravan that came from Mongolia, claiming that the caravan contained spies and therefore was a conspiracy against Khwarezmia. The situation became further complicated because the governor later refused to make repayments for the looting of the caravans and handing over the perpetrators. Genghis Khan then sent again a second group of three ambassadors (two Mongols and a Muslim) to meet the Shah himself instead of the governor Inalchuq. The Shah had all the men shaved and the Muslim beheaded and sent his head back with the two remaining ambassadors. This was seen as an affront and insult to Genghis Khan.[...]
- The Mongol army quickly seized the town of Otrar, relying on superior strategy and tactics. Genghis Khan ordered the wholesale massacre of many of the civilians, enslaved the rest of the population and executed Inalchuq by pouring molten silver into his ears and eyes, as retribution for his actions.
The Mongols' conquest, even by their own standards, was brutal. After the capital Samarkand fell, the capital was moved to Bukhara by the remaining men, while Genghis Khan ordered two of his generals and their forces to completely destroy the remnants of the Khwarezmid Empire, including not only royal buildings, but entire towns, populations, and even vast swaths of farmland. According to legend, Genghis Khan even went so far as to divert a river through the Khwarezmid emperor's birthplace, erasing it from the map.