Yanyun Sixteen Prefectures were invaded, and the Song Dynasty could not recover it for more than 300 years, so why was it taken back by Zhu Yuanzhang for 1 year?
Since ancient times, the sixteen prefectures of Yanyun have been the land ruled by the Central Plains Dynasty, but during the two Song Dynasties and three hundred years, this land no longer belonged to the Central Plains Dynasty, and if you add the nearly one hundred years of the later Yuan Dynasty, the Sixteen Prefectures of Yanyun were not under the rule of the Han people for four hundred years. Losing Yanyun Sixteen Prefectures, it lost the barrier of the north, so the Northern Song Dynasty has been clamoring to recover Yanyun Sixteen Prefectures, as for the Southern Song Dynasty in a remote corner, even the Central Plains have been lost, and it is not only Yanyun Sixteen Prefectures that need to be recovered, but the whole north.
So was the influence of the Yanyun region on the Northern Song Dynasty really that great? This impact is certainly not small, but this is definitely not the most important reason for its passive beating, in fact, the loss of another area is the most fatal, that is, the Hexi Corridor area, that is, the area occupied by the Western Xia, if this area can be firmly controlled in the hands of the Northern Song Dynasty, then the problem of warhorses will be solved, but unfortunately, since ancient times, the two most important natural pastures for raising horses in the north are others, then this weakness has become inevitable.
Zhao Kuangyin died unexpectedly before he could complete the task of recovering Yanyun Sixteen Prefectures, and after Zhao Kuangyi succeeded to the throne, he only hit the Northern Han Dynasty, and gave up after failing to attack the Khitan twice. As a result, Yanyun Sixteen Prefectures still fell into the hands of foreign enemies. After the establishment of the Ming Dynasty, Zhu Yuanzhang ordered Xu Da and Chang Yuchun to lead their troops north, and it took only one year to drive the Mongol nobles back to the desert using a gradual advance plan, and the Sixteen Prefectures of Yanyun were retaken.
After the Yuan Dynasty won the world, in order to better rule, it sent its largest killer Mongol cavalry to all parts of the country. It is precisely under the guidance of this kind of thinking that the Central Plains have never produced good horses, such as Shandong, Jiangxi, and even Yunnan, have built official horse farms, and even the Korean Peninsula has not been spared, such as the current South Korean island of Jeju, which was also one of the official horse farms of the Yuan Dynasty, called the Tam Roman Field. Finally, when Zhu Yuanzhang went on the Northern Expedition, war horses were already everywhere.