In the fourth year of Jianyan (1130), Yue Fei was ordered to form an independent army. At this time, there were less than 10,000 regular soldiers in the barracks. Subsequently, after some conquests and reorganizations, by the fourth year of Shaoxing (1134), when Yue Fei recaptured the six counties of Xianghan, the strength of the Yue family army had increased to more than 35,000 people. Relying on strict military discipline, the Yue family army was able to develop from "outlaws, indulgents, and murderous people in all directions" to a real army that "obeys orders and religion, and does not dare to disobey." With the power of swords, axes and sticks, a truly mighty master was created.
If Zhao Song wants to recover the whole north, it must pour out the strength of the country to launch a comprehensive strategic counteroffensive, this scene is too big, the Yue family army alone has been less than 100,000 people can fight again, it is not enough, when Zhao Zhao's 12 gold medals were issued, the other battlefields on the eastern front before, the Song army has retreated, if Yue Fei does not care about his own independent march, there should be some progress in the Henan battlefield, the possibility of taking Kaifeng is very large, but with the break with the imperial court, the cut off of logistical resources, the loss of troops increased, Jin Guo could mobilize troops from other battlefields to encircle and suppress Yue Fei, and in the end it was still a dead end.
Yue Fei's loyalty, military strength, and achievements attracted the attention of the imperial court and Emperor Gaozong, and in July, the imperial court awarded Yue Fei the defense envoy of Changzhou, the envoy of Tongtai Town, and the governor of Taizhou. In December 1131, Yue Fei was promoted to the post of deputy commander of the Shenwu Army, rising to the rank of general. At that time, people used to use the surname of the general of the army to give military names, such as calling Liu Guangshi's department "Liu Jiajun", Han Shizhong's department "Han Jiajun", and Zhang Junbu "ZhangJiajun". According to custom, people also called Yue Fei's unit "Yue Jia Jun", and since then, the name of "Yue Jia Jun" has begun to sound, and the more it is called, the louder it is.
Yue JiaJun is a kind of oral expression of the people, not an official name, nor is it a formal organization. At that time, it was customary to call the army under his command by the surname of the commander, such as Zhang Junbu could be called "Zhang Jiajun", Han Shizhongbu was called "Han Jiajun", Liu Guangshibu was called "Liu Jiajun", etc., especially Yue Fei's Yue Jiajun, who was good at war and strictly disciplined, became a barrier for the Southern Song Dynasty court to establish the state of Jiangnan, and played a pivotal role in the anti-Jin struggle.