Mongol Conquest Of The Khwarazmian Empire

The Mongol invasion of Khwarezmia ( fa, حمله مغول به خوارزمشاهیان) took place between 1219 and 1221, as troops of the Mongol Empire under Genghis Khan invaded the lands of the Khwarazmian Empire in Central Asia. The campaign, which followed the annexation of the Qara Khitai khanate, saw widespread devastation and atrocities, and marked the completion of the Mongol conquest of Central Asia, and began the Mongol conquest of Persia.

Both belligerents, although large, had been formed recently: the Khwarazmian dynasty had expanded from their homeland to replace the Seljuk Empire in the late 1100s and early 1200s; near-simultaneously, Genghis Khan had unified the Mongolic peoples and conquered the Western Xia dynasty. Although relations were initially cordial, Genghis was angered by a series of diplomatic provocations. When a senior Mongol diplomat was executed by Khwarazmshah Muhammed II, the Khan mobilized his forces, estimated to be between 90,000 and 200,000 men, and invaded. The Shah's forces were widely dispersed and probably outnumbered — realizing his disadvantage, he decided to garrison his cities individually to bog the Mongols down. However, through excellent organization and planning, they were able to isolate and conquer the Transoxianan cities of Bukhara, Samarkand, and Gurganj. Genghis and his youngest son Tolui then laid waste to Khorasan, destroying Herat, Nishapur, and Merv, three of the largest cities in the world. Meanwhile, Muhammed II was forced into flight by the Mongol generals Subutai and Jebe; unable to reach any bastions of support, he died destitute on an island in the Caspian Sea. His son and heir Jalal-al Din managed to mobilize substantial forces, defeating a Mongol general at the Battle of Parwan; he was however crushed by Genghis himself at the Battle of the Indus a few months later.

After clearing up any remaining resistance, Genghis returned to his war against the Jin dynasty in 1223. The war had been one of the bloodiest in human history, with total casualties estimated to be between two and fifteen million people. The subjugation of the Khwarazmian lands would provide a base for the Mongols' later assaults on Georgia and the rest of Persia; when the empire later divided into separate khanates, the Persian lands formerly ruled by the Khwarazmids would be governed by the Ilkhanate, while the northern cities would be ruled by the Chagatai Khanate. The campaign, which saw the Mongols engage and defeat a non-sinicized state for the first time, was a pivotal moment in the growth of the Mongol Empire.

Background

The dominant force in late twelfth-century Central Asia was the Qara-Khitai khanate, which had been founded by Yelü Dashi in the 1130s. Khwarazm and the Qarakhanids were nominally vassals of the Qara-Khitai, but in practice, due to their large population and extent, they were allowed to operate almost autonomously. Of these two major vassals, the Qarakhanids were by far the more prestigious: they had ruled in the area for two centuries, and controlled many of the richest cities in the area, such as Bukhara, Samarkand, Tashkent and Fergana. By comparison, Khwarazm had only one major city in Urgench, and had only come to prominence after 1150 under Il-Arslan.

However, as the Seljuk Empire slowly fractured after the death of Ahmad Sanjar

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