their opponents who f!
             requently broke ranks. Genghis Khan would also organize his troops into decimal units and would send hand signals through the fighting to these decimal units. He was able to control his troops during battles very easily. Moreover, his armies were very mobile and could travel far reaching distances at quick paces. If any town that the Mongols encountered resisted, Genghis Khan would ruthlessly lay siege and completely massacre the inhabitants of the town. When news of his tactics spread, his armies easily and successfully took over towns that would surrender as soon as the Mongols arrived. It was in this fashion that the Mongol armies destroyed entire populations in China and other surrounding areas such as Poland, Russia, and Iran. The Mongolian Empire was perhaps the largest empire in human history in terms of geographical expanse. Genghis Khan was most interested, personally in capturing China for its riches, therefore he expanded southward; by 1227 he had conquered the city!
             of Beijing, and by 1241 the Mongols had conquered all of northern China. After the death of Genghis Khan in 1227, the next Great Khan to rule was Genghis' son, Ogodei (1229-1241). It was during his reign that China began to be fully exploited both economically and politically. The Mongols, in order to form durable political units, and to continue their expansion, began to associate with the peoples they had conquered. Since the Mongols were a small minority in a sea of many different people of differing backgrounds, they began to copy Chinese institutions. However the Mongols turned to foreigners, namely, Jürchin and Khitan, subjects of the Chin Empire, to help them copy C
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