Xu Dake defeated the Yuan Army with Wu Mu's suicide note. Why can't Guo Jing?

No matter what kind of deep hatred and disputes the people of the Central Plains have, they can always fight against the enemy hand in hand. No matter how strong Mongolia is, no one will join him. Guo Jing, the great warrior, held on to Xiangyang for decades, but he was defeated and died in battle. However, the two magic weapons, Dragon Slayer Road and Sword of Eternity, were forged before. And hid the suicide note of Jiuyin and Wu Mu in it, hoping that someone would know later and restore China.

Then why did Guo Jing use this book to successfully defeat the Yuan Army after reaching Japan, and why couldn't he defeat the Mongolian Army at that time? The reason is not difficult to understand, because even the best art of war needs people to implement it. Guo Jing was in the Southern Song Dynasty, when the Mongols had swept across Eurasia and breached hundreds of countries. The country's strength is extremely strong, which has never happened before.

However, the court in the Southern Song Dynasty was corrupt and incompetent, so it was not easy to guard Xiangyang City, which had a very high wall. It is absolutely impossible to defeat Mongolian soldiers in the battle outside. The court in the Southern Song Dynasty could not give full play to its combat effectiveness without reform.

Tens of thousands of troops guarding Xiangyang city, because Guo Jing is still here, can also display some guarding city skills. Once they fight outside, I'm afraid they will be wiped out. No matter how good the art of war is, it ultimately depends on people, not just Guo Jing. Neither can Yue Fei. In the Xu Da era, under the leadership of Zhu Yuanzhang, the Chinese nation was revived. The fighting capacity of the Ming army far exceeds that of the Southern Song Dynasty, so Xu Da can make the Ming army stronger with this book at this time.