The military in the Song Dynasty was a big joke.

Military victory depends on many important factors, and it is also true that you said that the military in the Northern Song Dynasty was not feasible. However, it should be noted that at that time, the army in the Northern Song Dynasty was mainly infantry, while the nomadic people in the North were mainly cavalry, which was particularly mobile. Attacking infantry is like chopping melons and vegetables. The Song Dynasty lacked powerful generals and could not effectively defend the northern minority regime. After all, the Great Wall defense line could not be built, so we had to bite the bullet and meet the enemy's tiger and wolf division. Besides, nomadic people have always had advantages in life, so you can't criticize the Song Dynasty. Moreover, there have been serious problems in the political system and economy of the Song Dynasty, and the situation of poverty and weakness has not been changed for a long time. Only when the civil servants are single-minded and neglect the border defense will this dynasty be cast an indelible shadow.

As for the Southern Song Dynasty, it was even worse. The land area has shrunk severely and the military strength has been greatly weakened. As for Yue Fei, that is not a savior. After all, the country's comprehensive strength is not good, the land has been recovered, and it needs capable people to guard it. Otherwise, it means there is no recovery. Yue Fei is suspected to be a warlord. The court has always suspected him, so his death is somewhat responsible. However, it is undeniable that the Southern Song Dynasty did decline after that, and inherited most of the shortcomings of the previous dynasty, and finally gradually declined and finally disappeared.