Mongol invasion of the Khwarazmian Empire
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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. Wikipedia
Start date: 1219
End date: 1221
Territorial changes: Khwarezmia annexed to the Mongol Empire
Location: Central Asia, Iran, Afghanistan, and more