The Mongols Conquer Asia
Genghis Khan was not satisfied to rule only his fellow Mongolians. Under his leadership the armies of Mongolia first conquered the other steppe nomads. As they did so, they became more powerful. These conquered peoples paid the Mongols tributes, giving them increased wealth. They also provided thousands of soldiers to fight in the Mongolian armies.
In 1211 A.D., an army of over 100,000 horsemen invaded China. By 1270 A.D., all of China lay under the control of the Mongols.
The Mongols also conquered much of Russia, Islam, and many of the Slavic peoples. Their conquests were swift and brutal, often leaving thousands dead behind them.