In the tenth year of Shaoxing, Jin Wushu tore up the peace agreement and went south in four ways. Jin Wuxuan personally led the main force to attack Kaifeng Mansion, the marshal's right supervising army Wanyan Sali attacked Shaanxi, Li Cheng, the prefect of Jinhenan Henan, attacked Xijing Henan Mansion, and Nie Lijin attacked Song Zhijing Jingdong Road.

On the battlefield in Shaanxi, because Wu Jue had died of illness the year before, the right guard army under his jurisdiction was led by his deputy General Hu Shi, Wu Luan, Yang Zheng and Guo Hao, three troops who were all under the command of Wu Xuan, Yang Zheng and Guo Hao, and the troops who were all in a stalemate in Guanzhong, and the two sides were in a stalemate.

On the battlefield of Jingdong Road, Han Shizhong's troops captured Haizhou and defeated the Jin army in Lukou Town, Tancheng, Qianqiu Lake and other places near the Huaiyang Army, and stalemate with the Jin army under the Huaiyang Army City.

The east and west roads were all in a state of draw, and the most critical central battlefield, the main force led by Jin Wuxuan, with the help of Li Chengyi's army, competed with Yue Fei's Yuejia army, Zhang Jun's camp guard, and Liu Qi's 20,000 eight-character army.

In May, Liu Qi's 20,000-character army was on its way to Kaifeng, passing through Shunchang Mansion. In Shunchang, he first defeated the Jin army led by King Ge Wanyan and the Dragon and Tiger King Wanyan Tuhesu, and then defeated the main force led by Jin Wuzhen again.

The Southern Song Dynasty Emperor Zhao Gou, who had always been frightened in the face of the Jin State, ignored the opinions advocating resistance to the Jin, fled south surrounded by the surrender faction, and threw a large area of territory and ordinary people in the Huanghuai region to the Jin army. The people of Huanghuai and Huai were unwilling to be ravaged by the Jin people, and they organized rebel armies one after another and launched a vigorous anti-Jin struggle. Among these rebel teams, the largest number of people, the strongest team, and the greatest influence are the first to promote the eight-character army.

The leader of the eight-character army is named Wang Yan, he was very interested in the art of war when he was young, and he also made military exploits after joining the army. When the Northern Song Dynasty attacked Western Xia, his talent was already evident in the army, but it was never reused by the imperial court. Wang Yan accepted the leadership of Li Gang and Zhang Suo, and led Zhang Yi, Bai Anmin, Yue Fei and other more than a dozen generals and 7,000 soldiers to take the initiative to cross the river and launch an offensive against the Jin army. The Jin army was unprepared, and Wang Yan quickly conquered Weizhou Xinxiang.

Seeing that the situation was not good, the Jin army mobilized a large number of soldiers and horses to rush to Xinxiang, Wang Yan saw that there were too many Jin troops, and in order to preserve his strength, he led his brothers to kill the encirclement and retreated to the area north of Xinxiang. Later, he transferred to Xishan, united with the anti-Jin rebels there, and continued to fight against the Jin army.

The Jin army was very afraid of Wang Yan, and offered a high bounty to capture Wang Yan alive, but Wang Yan didn't care about these at all, and his generals in order to show their support for Wang Yan and never betray, they all tattooed on their faces "Serve the country with a naked heart, swear to kill the gold thief" Eight big characters, hence the name of the eight-character army.

Under the leadership of Wang Yan, the Bazi Army often launched attacks on the Jin army, fighting in the south and in the north. They are also very flexible in their tactics, they will fight if they win, and they will leave if they can't. And all the soldiers of the Eight-Character Army were desperately killing the enemy in the battle, all of them were brave, and the Jin soldiers were frightened, and they couldn't wait to destroy the Eight-Character Army immediately.

Once, Marshal Jin Jun gathered his generals for a meeting to discuss how to capture Wang Yan as soon as possible and eliminate the henchman of the Bazi Army. When the generals heard that they were going to fight Wang Yan's eight-character army again, their faces turned white with fright, and they knelt down together and said: "Wang Yan's camp is as strong as an iron bucket, and there is really no way to break through it, so how can Wang Yan be captured alive? Seeing that these generals were so timid, the commander of the Jin army had to change his battle plan to attack Wang Yan.

Under the leadership of Wang Yan, the ranks of the Bazi Army continued to expand, especially when they held on to the Taihang Mountain area, many local militiamen took the initiative to participate in the ranks of the Bazi Army. At this point, the Bazi Army, known as nearly 200,000, continued to attack the Jin army in the Taihang Mountains, so that the Jin army was unable to move south to attack the Southern Song court. Later, Wang Yan was recommended by Zhang Jun, a general who defended Sichuan and Shaanxi, to be the commander of the former army, so he led part of the Bazi Army to fight in the Sichuan-Shaanxi region to resist the Jin Army, and since then the Bazi Army has resisted the invaders of the Jin State on the east and west battlefields respectively.

The eight-character army bravely resisted Jin, was not afraid of sacrifice, and defended the country, which formed a sharp contrast with Song Gaozong's behavior of retreating and blindly fleeing from Jin.

The Bazi army repelled the female Allah Tiefutu and the kidnapping horses who attacked Shunchang with horse rejection equipment and heavy axes in the form of Yicheng field battles. More than 5,000 Jin troops were killed, more than 10,000 were wounded, and more than 3,000 dead horses were left in Shunchang.

The Kidnapping Horse is the name of the Song people's cavalry on the two wings of the main force of the Jin Army, and the Kidnapping Horse belongs to a kind of light or medium cavalry, which is arranged on both wings, which can make full use of its high mobility and the huge impact generated by the group charge, which is used to outflank the enemy and then assault.

Tiefutu is another name for the Jurchen heavy cavalry, also known as the iron tower soldiers, and the iron futu describes the heavily armored knights dressed like iron towers. Unlike the tactics of outflanking the two wings of the kidnapping horse, the task of the Tiefutu is mainly to attack the fortifications head-on, and its role is like a tank in modern warfare, which is why it is necessary to equip such heavy armor and interconnect the horses with leather ropes at the expense of cavalry mobility.

Kidnappers were placed on both flanks to outflank the enemy and then assault them. They were disciplined and brave in battle, and each knight was usually armed with two horses to ensure mobility in battle. Armed with a combat-type cold weapon and a bow and arrow, he can be used as a mounted archery for long-range attacks and as an assault force for close-range combat.

This kind of cavalry, the horse and the rider have a certain amount of protective armor, and at the same time take into account the requirements of light and agility, and the kidnapping horse belongs to a light or medium cavalry. As a nation on horseback, the Jurchens were the backbone of the cavalry on the battlefield, and they often came to cover with iron horses and wings, which shows that the task of the Jin army's kidnapping horses was to outflank and cover.

In ancient warfare, the cavalry of the brigade was often placed on the two flanks, so that they could take full advantage of their high mobility and the huge impact generated by the group's charge to surprise the enemy's flank. And the two-wing cavalry needs to be of considerable size in order to realize its combat intentions.

Therefore, the abducted horse is actually the main force of the Jin cavalry, and the Jin Jurchens used the tactics of soldiers, often using infantry as the main soldier, and relying on the left and right wing cavalry to make roundabout flank attacks to outflank the enemy.

Tiefutu is another name for the Jurchen hoplites, who have heavy armor and strong ability to attack fortifications. The cavalry was the only regular army in the early Jin state, and all the infantry in the Jin army were played by Han Chinese, they were not standing regular troops, and their role was to carry salaries, dig trenches, bluff, and carry grain and grass. It is impossible for them to be equipped with expensive heavy armor, that is, it is not the infantry of the Jin army who wears such heavy armor, but only the Jurchen cavalry who are qualified to wear heavy armor.

The main force of the Jin cavalry could only be light and medium left and right flank cavalry kidnapping horses, not heavy cavalry Tiefutu. This is because the ancient heavy armor was very expensive, and it was impossible to equip it on a large scale, and because the heavy cavalry had to fight while bearing the weight of the armor, which required them to have a superhuman physique, so the number of Tiefutu was definitely not very large, and there were only 3,000 people in the Battle of Shunchang. It can be seen that heavy cavalry can only be the essence of cavalry, and their identity should be different from that of ordinary Jurchen cavalry.

The main force of the cavalry of the Jin Army is light or medium cavalry, and in addition to this, there are heavy cavalry with full armor and strong combat effectiveness and defense. The abductor horse can advance or retreat, see the forward, and the iron float must be used to reject the horse, the person further, move the horse one step, show no hesitation. Unlike the tactics of outflanking the kidnappers and horses, the task of the Tefutu is to attack the fortification head-on, and it plays the role of a tank in modern warfare, which is why it is equipped with such heavy armor at the expense of cavalry mobility.

Another characteristic of the Jin army's Tiefutu is that in certain occasions that are not conducive to cavalry combat, they often dismount and use them as hoplites.

The Jurchen cavalry was able to fight with perseverance and resilience, while the cavalry of the Yue family army continued to fight fiercely for dozens of rounds, and they were not tired or discouraged. Seeing that the cavalry could not win the battle, Jin Wushu was very anxious, so he ordered the heavily armored and heavily armored Tiefutu army to enter the battle, in an attempt to crush the opponent's scattered cavalry with a strict and dense heavy cavalry formation.

Learning from the experience of Liu Qi in the battle of Shunchang to break the enemy, Yue Fei had already prepared for this, so he immediately sent the infantry of the Yue family army and ordered the soldiers to hold hemp knives, knives, and axes, and fight with the thieves to deal with the Tiefutu heavy cavalry loaded with heavy armor and connected by leather ropes and blocking the wall.

Divine arm bows, hemp knives, knives, big axes, etc. are indeed sharp weapons for infantry to deal with cavalry, and they are also the nemesis of the Tiefutu army, and these sharp weapons for foot riding have indeed hit the Jurchen cavalry of the Jin State, otherwise the commander of the Jin army, Jin Wuxuan, would not have said that the weapons used by the Song people are only the divine arm bow, and the second is the heavy axe. And the heroic infantry officers and soldiers of the Yuejia Army used these sharp weapons of infantry and cavalry to deal with the Jurchen heavy cavalry Tiefutu Army, thus winning a complete victory.

Murong Ke, the Xianbei commander of Qianyan, was connected with iron cables, Jian Shan shot five thousand brave and unrigid people, and the phalanx was forward, Murong Ke's tactics were obviously similar to the Jin army's heavy cavalry Tiefutu. As early as the period of the two Jin and Northern Dynasties, the cavalry troops of the nomadic Xianbei who invaded the Central Plains had used iron cables and horses to defeat the troops of Ran Wei and Ran Min, so in the two Song dynasties, the Jurchens of the Jin State who invaded from the north occasionally used the tactics of three people to connect with Wei Suo, which was not impossible.

As a result, the Jin army switched from a full-scale offensive to a partial defense, Jin Wushu and Wanyan suddenly retreated to Kaifeng, Han Chang defended Yingchang Mansion, General Zhai defended Huaining Mansion, and all three roads were unified to complete Yan Alu to defend Yingtianfu, with Yingchang, Huaining, and Yingtian as the defense of Kaifeng Mansion.