Background
For more details on this topic, see Mongol invasion of Central Asia.In 1219, in retaliation for the murders of his ambassadors, the Mongol Khan, Genghis Khan, invaded the Khwarezmian Empire. In a campaign that lasted three years, Genghis Khan and his generals destroyed the Khwarezmian armies and caused the empire to disintegrate. The Khwarezmian Sultan Ala ad-Din Muhammad succumbed to disease on an island in the Caspian Sea, leaving his son, Jalal ad-Din Mingburnu landless.
When Jebe (one of the Mongol generals pursuing Muhammad) heard of Ala ad-Din Muhammad's death, he asked Genghis Khan for a year or two to continue his conquests before returning to Mongolia via the Caucasus.
While awaiting Genghis' reply, Jebe and Subutai (another general pursuing Muhammad) led their army of 20,000 men, with each general commanding a tumen. They left behind a trail of destruction as they moved through Persian Iraq (Iraq-i Ajam) and Azerbaijan, sacking the cities of Rey, Zanjan and Qazvin. The city of Hamadan surrendered without a struggle. Meanwhile, Özbeg, the Atabeg of Azerbaijan, saved his capital, Tabriz, and prevented his country's destruction by offering to the Mongols a large amount of money, clothing and horses, which were the Mongols' best weapons.
From Tabriz, the Mongols advanced north and made their winter base in the Mugan Steppes. There, the army was strengthened by the arrival of Kurdish and Turcoman freebooters, who offered their services to the Mongols.
Read more about this topic: Battle Of The Kalka River
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