Yue Fei was a general of Southern Song Dynasty, who fought victoriously against the invading forces of Jin Dynasty. He studied hard since he was a child, and was particularly interested in strategics. He joined the army when he was 20-year-old and became famous for his bravery. Yue Fei wanted to reoccupy the territory of middle China which had been occupied by Jin Dynasty with all his heart. While he was rather strict with himself, he cared for and cherished the soldiers. Yue army led by him was very intrepid and never lost in the battlefield.

In 1140, Jin army under Genreal Wu Zhu attacked Southern Song Dynasty. Yue Fei commanded Yue army to fight against them. Wu Zhu had cavalries with special training. The soldiers and warhorses were all clad in thick armor called "guaizi horse" and had them to attack Yue army. Yue Fei found out the weakness of "guaizi horse" and instructed his soldiers to bend and to hack at the horses unprotected legs. In this way, Jin troops fell down from the horses and were crushingly defeated. When Wuzhu heard about this sad news, he burst into a cry bitterly. He said that since he commanded the army to fight, his victories all depended on the "guaizi horse", that all was over. Yue army reoccupied a lot of lost territory of Central Plains. Ther was a saying in Jin army that, "It is easier to shake a mountain than Yue army", which means it is easy to push down a mountain, but it is too hard to beat the army led by Yue Fei.

Later, however, the fatuous Emperor Gaozong of Southern Song Dynasty made peace with Jin and asked Yue Fei to retreat from the battlefront. Yue Fei was dismissed, and in 1142 executed on a trumped-up charge of "moxuyou" (a local dialect meaning "perhaps having guilt"). Yue Fei was only 39 years old when he died.