Since he was twenty years old, he embarked on the road of resisting the Jin soldiers and made many military achievements; Yue Fei's army had clear rewards and punishments, the discipline of the troops was strict, and he was able to sympathize with his subordinates and set an example.
Yue Fei's subordinates had a soldier named Li Bao, Who was born in a poor peasant family and had a somewhat rogue temperament, so he had the nickname of "Pouring Li San", but Li Bao was very righteous, strategic, and bold, and he was very dissatisfied when he saw the Jin army wantonly trampling on the land of the Song Dynasty.
In the ninth year of Shaoxing, Po Li San led the villagers to resist the Jin soldiers in Puzhou (濮州, in present-day juancheng north of Shandong), but they were outnumbered, and Li San was defeated and luckily escaped, and on the way to escape, he heard that a great general who resisted the Jin soldiers was named Yue Fei, which made the Jin soldiers feel frightened, so he went south to defect to Yue Fei.
Po Li San once led the villagers against the Jin soldiers, although there was no victory, but it was also a mighty style, entered the Yue family army, but was a soldier, so that Po Li San was very dissatisfied, he complained with a group of people who were also defecting to Yue Fei, and some people said, "Or let's go, staying in our hometown is better than everywhere." ”
So Li San and the other forty people left the Yue family army camp overnight, but it was not long before they were discovered by the Yue family army, in the military regulations of the Yue family army, desertion is very shameful, it is a felony to kill the head, Yue Fei pays attention to military discipline, he ordered "beheading", Li San saw his own life, and hurriedly said that he was going back to resist the Jin soldiers, not to be a deserter.
There was a veteran soldier in the Yue family's army who had received the favor of Pu Lisan and learned that Po Lisan was indeed talented, so he asked Yue Fei for instructions, Yue Fei weighed it in his heart, and as soon as his heart softened, he left Li San's life, and agreed to put Li San back in Shandong to resist Jin.
In 1140, the Jin army turned its back on the alliance and went south, and Po Lisan cooperated with Yue Fei's counterattack, attacking the Jin army many times and clamping down on the Division of the Jin Dynasty going south, which made Yue Fei see Li San's strategy, so he gradually reused Li Bao. In the thirty-first year of Shaoxing, the Jin Emperor Yan Liang's troops attacked the Song Dynasty in four ways.
Among them, 70,000 troops were sent by sea and more than 600 warships, and if he wanted to take Lin'an (present-day Hangzhou, Zhejiang), Li Bao was promoted to deputy commander of the Horse Infantry Army on Zhejiang West Road, only 3,000 sailors and 120 warships, but Li Bao was confident and would be able to defeat the Jin army.
In October of the same year, Li Bao took advantage of the fact that the Jin army was good at water warfare and the flammable oil sails of warships, took advantage of its lack of preparation, and with the help of the south wind, he also used rockets, artillery and other weapons to carry out fire attacks, and fought with short soldiers, and won victory in one fell swoop, becoming a famous general who attracted the world's attention.
The thunderbolt cannon and felt cannon used by Li Bao, as well as the "fierce oil fire cabinet", are the world's earliest gunpowder-driven heavy weapons, and this battle has also been included in the "100 Most Significant Battles Affecting Mankind" by foreign countries.