他们扩展到现在俄罗斯联邦的Tuva地区，直到13世纪蒙古帝国的崛起，吉尔吉斯人开始了南迁。
They spread across what is now the Tuva region of the Russian Federation, until the rise of the Mongol Empire in the 13th century, when the Kyrgyz began migrating south.
建立蒙古帝国的成吉思汗一二○ 七年开始进侵西夏， 但要攻取一座宏伟城堡的时候， 发觉骑兵派不上用场。
Genghis Khan, founder of the Mongol Empire, began his invasion of Hsi Hsia in 1207. He soon learned the futility of using cavalry when he tried to take a mighty fortress.
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