Mongol campaigns in Central Asia occurred after the unification of the Mongol and Turkic tribes on the Mongolian Plateau in 1206. Smaller military operations of the Mongol Empire in Central Asia included the destruction of surviving Merkit and Naimans (which involved forays into Cumania) and the conquest of Qara Khitai. These were followed by a major campaign against Khwarazm. Expansion into Central Asia began in 1209 as Genghis Khan sent an expedition to pursue rivals who had fled to the region and threatened his new empire. The Uyghur kingdom Qocho and leaders of the Karluks submitted voluntarily to the Mongol Empire and married into the imperial family. By 1218 the Mongols controlled all of Xinjiang and by 1221 all the territories of the former Khwarazmian Empire. In 1236, the Mongols defeated the eastern portions of Cumania and swept into Eastern Europe.
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Mongol conquest of Central Asia in the context of Mongol invasion of the Khwarazmian Empire
Between 1219 and 1221, the Mongol forces 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. The invasion 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; nearly 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, the Mongols 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 forces of 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, but these were crushed by Genghis at the Battle of the Indus a few months later.