First of all, I would like to show my point of view: the southern Song Dynasty military is not weak, not only not weak, but also very strong.
Mongolian Iron Horse
If from the sixth year of the Mongol Wokoutai Khan to the sixteenth year of the Yuan Dynasty (the second year of the Southern Song Dynasty, 1234-1279), the Mongol (Yuan) army attacked the Southern Song Dynasty. The Southern Song Dynasty resisted for 46 years. Look at how long those countries in Europe and West Asia resisted the Mongol army? Let's say a very typical case: King Bella of Hungary organized an army of 100,000 people to fight a decisive battle with 60,000 Mongol troops, and finally lost only 2,000 people, and the Mongol army suffered very few casualties.
So why was the Song Dynasty able to resist the Mongols for so long?
First, the geographical location of the Southern Song Dynasty was good, and the areas south of Sichuan, Chongqing, and Hubei were mountainous and watery, and the advantages of the Mongol army were not easy to play.
Second, the Southern Song Dynasty produced two famous generals, Meng Jue and Yu Jiu, who played a vital role in the fight against Mongolia. They built a complete defense system, so they enjoyed the title of "mobile defense master". This defense system now seems to be outdated. When the best option against mobile forces.
Third, in 1257 AD, the Mongols besieged Diaoyu City, and even the Mongol Great Khan was killed under the city in the war, and the defender at that time was General Wang Jian, not Guo Jing Huang Rong. Jin Yong said in "The Divine Eagle Hero" that Yang Guo killed with flying stones, and the death of the Great Khan caused the Mongols to return to compete for the Khan's position, which consumed several years, which also continued the life of the Southern Song Dynasty.
Ruins of the Battle Headquarters of Diaoyu City
Fourth, the economy of the Southern Song Dynasty was much stronger than that of Mongolia. War is about fighting logistics. Although the Southern Song Dynasty also had internal power struggles, its strong economic strength gave the Southern Song army enough strength to fight against the Mongols. It is also because of the development of the economy that the scientific and technological level of weapons in the Southern Song Dynasty is also higher than that of Mongolia. During the battle, the Mongols were also learning advanced military techniques from the Southern Song Dynasty.
Fifth, the Southern Song Dynasty army has been fighting with the masters, first against Jin, and then against Mongolia. Although the field combat ability is almost the same, the defensive ability is definitely the first class at that time.
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The Southern Song Dynasty was defeated by infighting, and if it was sincerely united and reduced internal consumption, it was really difficult to say whether Mongolia could destroy the Southern Song Dynasty.