成吉思汗是一位伟大的军事统帅,1206年,他统一了蒙古各部,建立了一支攻无不克的军队。从12世纪初到13世纪中叶,在中国辽阔的土地上,有宋、辽、金、西夏、吐蕃、大理六个王国。它们长期处于相互纷争、混战的局面。蒙古要想灭金复仇,占领中原和江南的南宋,首先必须解决横跨在蒙古与金、宋以及 Genghis Khan was a great military commander. In 1206, he unified all ministries in Mongolia and established an all-encompassing army. From the beginning of the 12th century to the middle of the 13th century, there were six kingdoms of Song, Liao, Jin, Xixia, Tubo and Dali on the vast land in China. They have long been in a situation of mutual disputes and melee. In order to extinguish gold for revenge in Mongolia, the Southern Song Dynasty occupying the Central Plains and the Jiangnan areas must, first and foremost, tackle the issue of cross-strait relations between Mongolia and Jin, Song and