In 1225, at Wuma Mountain, 50,000 Song troops and 20,000 Mongol soldiers fought continuously, regardless of victory or defeat. At this time, Shi Tianze personally led fifty elite "Han troops" to quietly come to the back of the mountain and raid the weak points of the Song army. The Song army suffered an enemy on its back, and the general Peng Yibin was captured, refused to surrender to the Mongols, and was executed.
Peng Yibin, a famous general of the Southern Song Dynasty, known as "Yue Fei", was bent on restoring the Central Plains and recovering the lost land. In 1211, Genghis Khan led an army of 150,000 to the south, attacked the Jin Kingdom in two ways, defeated 450,000 Jin troops at the Battle of Wild Fox Ridge, and seized the initiative in the battle.
After the Battle of Wild Fox Ridge, the Mongol cavalry drove straight in, and uprisings broke out in Hebei and Shandong, and the "Red Jacket Army" was a well-known one. Some of these rebel armies supported the Jin Dynasty in its fight against the Mongols; some defected to the Mongols, such as the Shi Tianni and Shi Tianze brothers; and some defected to the Southern Song Dynasty and wanted to restore the Central Plains.
Peng Yibin, a famous general of the "Red Jacket Army", fought against the Mongol cavalry for a long time, and then defected to the Southern Song Dynasty, known as the "Loyal Rebel Army", which was a strong force in the Southern Song Dynasty court to recover the Central Plains. After that, Peng Yibin fought harder, saying that he would emulate Yue Fei and restore the Great Song Dynasty.
Peng Yibin is brave and good at war, strategic, and jealous as a vendetta, he is not accustomed to Li Quan, who is also from the "Red Jacket Army", and the contradiction between the two is very deep, and they often meet each other. Li Quan, who was strong in combat, but not firm in his will, oscillated between Mongolia, the Jin Dynasty, and the Southern Song Dynasty, which was very unfavorable to the Southern Song Dynasty's recovery of the Central Plains.
Li Quan's position was not firm, and Peng Yibin was very annoyed, so he led his troops to sneak into Li Quan's convoy and seize three thousand horses. With these horses, Peng Yibin was able to form a powerful cavalry to cross Shandong and Hebei and recover many places. When Peng Yibin was at his strongest, he commanded hundreds of thousands of soldiers and horses, which made Mongolia jealous.
In order to effectively fight against the Mongols, Peng Yibin joined forces with the famous Jin general Wu Xian to defeat Shi Tianni at Zhending and behead him. As soon as Shi Tianni died, the "Han army" in the Mongolian camp was terrified and defeated in Hebei, and even if Shi Tianze regained command, it would be difficult to reverse the situation.
With hundreds of thousands of troops in hand, although there are not many elite troops, they have a huge momentum, and it is still very certain to deal with the "Han army" in the Central Plains. In 1225, Genghis Khan mobilized soldiers and horses to prepare for the Western Expedition to Shuchi and maintain internal rules. Shu Chi, the eldest son of Genghis Khan, is brave and good at war, but his identity as an "uninvited guest" makes him depressed.
The main Mongol force returned to the north of the desert, and Genghis Khan prepared to march west, but when the news of Shuchi's death came, Genghis Khan was so sad that he blamed his eldest son and stopped acting. Riding on the return of the Mongol soldiers, Peng Yibin besieged Dongping and dealt with the famous generals of the "Han Army", and the two sides fought under the city for more than a month.
Yan Shi, a famous general of the Jin Dynasty, later surrendered to Muhuali and sent 300,000 households under his control to the Mongols, so that they were reused. Yan Shi was not Peng Yibin's opponent, so he asked the Mongol king Polo for help, but Po Lihai was afraid of Peng Yibin and did not rescue Dongping.
The Mongol soldiers did not come, Yan Shi took the initiative to surrender to Peng Yibin, became a member of the Song army, and was not firm in his position, ready to defect to Mongolia again. Considering the prestige of yanshi in Hebei, Peng Yibin treated him with courtesy, so as to attract loyal and righteous people from the Yanzhao region to come to him and contribute to the great cause of the Northern Expedition.
After capturing Dongping, Peng Yibin swept through the nearby state capitals and drove the Mongol soldiers away. In order to deal with Peng Yibin, Polo mobilized soldiers and horses from all over the country, with Po Caspian Sea as the main commander and Shi Tianze as the vanguard, and led 20,000 soldiers and horses to attack Peng Yibin and eliminate this Song army isolated in the Central Plains.
When Peng Yibin entered Hebei from Shandong, he made a proposal to the Southern Song Court: first eliminate Li Quan, capture Shandong, and then march into Henan and Hebei to recover the Central Plains. With Henan, Hebei, and Shandong as forward bases, it is not difficult to recover Yanyun Sixteen Prefectures. However, the Southern Song Dynasty was discussing with Jis Khan the strategy of "joint resistance to Jin" and ignored Peng Yibin's suggestions.
The southern Song dynasty court's attitude was unclear, and it was afraid of offending the Mongols, and Peng Yibin fought alone, fighting alone in the Central Plains, and his environment was similar to Yue Fei's. Po Caspian and Shi Tianze led 20,000 soldiers and horses to come, and Peng Yibin waited in a strict position, preparing for a head-on duel with the Mongol cavalry. Who knows, Yan Shi rebelled again, which caught the Song army off guard.
Yan Shi was about to turn against the enemy, the Mongol cavalry took advantage of the situation to launch an attack, Peng Yibin was unfavorable in battle, retreating to Wuma Mountain, and there were more than 50,000 people in his army. Wuma Mountain, located in Shijiazhuang, Hebei Province, is a dangerous terrain that is easy to defend and difficult to attack. Yan Shi rebelled and took most of the soldiers and horses, the strength of the Caspian Sea and Shi Tianze increased greatly, and the Mongol soldiers and the "Han army" approached 100,000.
With Wuma Mountain as a support, Peng Yibin strictly guarded against death, and repeatedly repelled the charge of the Mongol cavalry. At night, Peng Yibin sent troops to attack at night, leaving the Caspian Sea unrestful. As the war progressed, the grain and grass in the Caspian Sea were exhausted, and the famous Jin general Wu Xian came to reinforcements, so he planned to withdraw his troops and consider the long term.
The Caspian Sea was shaken, Shi Tianze did not give up, he asked the nearby villagers to inquire, and learned that there was a small road behind the mountain, which could directly raid the Song army camp. When the Song army and the Mongol army were engaged in battle, Shi Tianze led 50 "Han troops" to act as death squads, cut through thorns and thorns, and launched an attack from the trail behind the mountain to directly attack the Song army camp.
The "Han army" suddenly killed, Peng Yibin was defenseless, and the Song army was in chaos. Taking advantage of the onslaught of the Caspian Sea, Peng Yibin collected and scattered the Song army, retreated to the top of the mountain, continued to fight bloodily, and was captured with all his strength. Shi Tianze admired him very much, so he suggested that Peng Yibin submit to Mongolia and work together to build a career for Genghis Khan.
Shi Tianze persuaded him to surrender, but Peng Yibin sternly refused, saying that his soldiers of the Great Song Dynasty, Shandong and Hebei, were also the territory of the Great Song Dynasty, and how could they be subordinates of others. Shi Tianze was ashamed and left the seat, and Peng Yibin was executed.
Bibliography: History of the Yuan