In addition to the water bandits in Yongqu Township, there are also bandits who occupy Dayi City. Zhao Shicai took all the new annexed troops of Dayi with him during the attack on Wanjiabao, and only a few of them escaped back after they were killed or captured. After Zhao Shicai's army was defeated and died, the Mongols recruited a bandit in the Heming Mountain in Dayi County to defend the empty Dayi City. And the remnants of Xiong Ben's bandits who fled into the ravine behind Yongkang City have also gained a firm foothold, and there is a faint tendency to sit down, in line with the principle of eliminating evil, this time they will also be exterminated.

At that moment, everyone agreed to divide into three ways to suppress the bandits, the first route was Huang Dagen's teaching company and the newly established water army camp, which was responsible for exterminating the water bandits in Yongqu Township. There are three companies under the water barracks, which are mainly composed of Xinjin City sailors who defected, and some of the soldiers of the new annexed army of Chongqing Mansion who defected to Cheng were selected. The battalion commander was concurrently served by Huang Dagen, Le Quanan, Liao Loach, and Yu Laodua were respectively appointed as company commanders, and some veterans of the field battalion were transferred to serve as squad and platoon commanders. The second route was Cao Ergou led the second to fifth companies of the field battalion, which was responsible for attacking the bandits in Dayi City. On the third road, Dong Hu led the hoe company of the internal guard battalion and the sixth company of the field battalion, which was responsible for exterminating the remnants of the Xiong Ben bandits. Among the four companies of the internal guard battalion, the guard company is responsible for the guarding of important personnel and places, and there is no manpower at all; During this period, the counter-espionage company had to screen a large number of civilians and surrender troops, and the task was extremely heavy; In addition to reconnoitering the battle in Chengdu, they also had to pay close attention to the situation of the Mongolian army cantonments, and their manpower was already overstretched; There are only fewer things in the current situation, and it is Ouyang Xuan's idea to train troops through actual combat against bandits.

For this crackdown on bandits, after Ouyang Xuan set the goals and principles of action through the military and political meeting, he made Cao Ergou, Huang Dagen, and Dong Hu fully responsible. On the one hand, they fully believe in the ability of the three people, and believe that the officers and men of the Perak Army will learn war in the war, and then grow rapidly. On the other hand, no matter how good the plan is formulated by the staff officers, it cannot keep up with the rapid changes in the battlefield situation, and only by letting go and letting the various units adapt to the situation can the campaign objectives be achieved. An important reason for the low combat effectiveness of the Song officers and troops was to prevent the generals from abusing their powers, and the generals who led the troops to fight were too restricted, and the operations had to be carried out according to the plan of the civilian officials of the Privy Council behind closed doors, and even the combat time and military formation and formation were not allowed to be changed without authorization. "There will be no military orders outside the country," and the Thunderbolt Army must not have such a rigid mode of operation. Of course, Ouyang Xuan didn't act with the army because he had more important things - building Hengyuan Fort.

In the cold of spring, the three bandit suppression troops in Thunderbolt set off one after another. It was the turn of winter and spring, but the weather was unusually cold and dry. Although the weather was cold, it also made the roads hard and conducive to marching. Dong Hu's subordinates only carried four light tiger squat guns into the mountains on foot because they wanted to enter the more rugged and difficult mountains behind Yongkang to suppress bandits; Cao Ergou's headquarters and Huang Dagen's teaching company used wheelbarrows to transport artillery and marched along the official road towards their respective destinations; The three companies of the naval camp took a warship down the river and went straight to Yongqu Township. Who would have thought that these three troops, with their different military methods and combat styles, would be the predecessors of the famous field army, navy army, and special operations forces after the Thunderbolt Army.

The first to take action and the first to end was Cao Ergou's department. They set out from Wanjiaping, rested for one night in Hengyuan Village, and hurried for fifty miles early in the morning of the next day, and finally arrived at the east gate of Dayi City before evening. Before the battle, the Thunderbolt army detected that there were 50 Mongolian cavalry and more than 200 newly recruited bandits in Dayi, plus 200 newly captured strong men, a total of about 500 people. Although the number of defenders of the city was more than the four companies led by Cao Ergou, except for the fifty Mongolian cavalry worthy of attention, the rest of the bandits and the people were worried about their combat strength, and Cao Ergou was confident that he would go down with one blow.

When the Thunderbolt army entered two miles away from the city and was about to set up camp, the gate of Dayi suddenly opened, and the Mongolian cavalry in the city suddenly rushed straight towards the Thunderbolt army. These cavalry came very quickly, and with the fact that there were three horses and one man, hundreds of horses' hooves trampled on the ground like thunder, and rolling dust rolled up behind them, which was quite amazing. Fortunately, Cao Ergou experienced a charge outside Yongkang City, and Huang Dagen also taught the experience of encountering cavalry outside Chongqing Mansion, so although the Perak soldiers were surprised, they were not panicked. The soldiers of each company, under the command of the officer, erected huge shields, erected spears, and prepared to throw grenades and muskets, and also threw dozens of thistles in front of the battle. This thistle terrestris is slightly larger than a fist, and has four iron spikes several inches long, one of which is pointed upwards when it lands on the ground, and is a sharp weapon against cavalry charges.

These Mongol cavalry did not use the usual method of shooting bows and arrows, but rushed straight at the side of their rifles, apparently trying to break the formation with the Thunderbolt army unstable. Seeing this, Cao Ergou hurriedly ordered the musket to be fired. Although the Thunderbolt Army is currently equipped with rear-loading rifled muskets with slow rate of fire and poor accuracy, they are superior to bows and arrows in range and power, but due to manufacturing technology, mass production has not yet been implemented, and the whole army is equipped with less than 100 pieces, and only about 20 are allocated to Cao Ergou's department. Therefore, this round of musket fire only knocked down a few horses, which slightly reduced the momentum of the Mongol charge, and did not cause death to the cavalry. It is to say that these Mongols were also skilled horsemen, and after falling from their wounded horses, they immediately jumped onto empty horses and rejoined the charging array.

As the Mongolian cavalry got closer and closer, more than 100 horses stepped on the ground at the same time like muffled thunder, making the land in front of the Thunderbolt army also begin to tremble slightly. Fifty cavalrymen had such an impact and sense of oppression, which made Cao Ergou secretly frightened, and he eagerly ordered to throw a grenade in advance. The loud sound of successive explosions and the iron thistle terrestris in front of the formation caused more than ten horses rushing in front to fall to the ground one after another, which made the Mongolian cavalry behind have to quickly turn their horses' heads and go around the Thunderbolt array.

When the Mongol cavalry regrouped and prepared to charge the flanks, they found that the two wings of the Thunderbolts were tightly protected by huge shields and spears. At this moment, the leader of the Mongolian cavalry knew that even if he could force his way into this turtle array, it was estimated that there would not be a few of his men left in the explosion and spear stabbing. Seeing that the forced charge failed, the Mongol cavalry surrounded the Thunderbolt army array, and released arrows while riding their horses. Because the Mongolian cavalry has been out of the grenade throwing distance, the Thunderbolt army can only rely on muskets to shoot at the Mongolian army, but because the Mongolian cavalry is still moving, and the musket rate of fire and accuracy are not as good as the bow and arrow, and the number is not as strong as the Mongolian army's strong bow, so although the Thunderbolt army has the protection of a giant shield, it is still at a disadvantage in the counterfire. The arrows that blessed the horse's speed were so powerful that they shot straight at the giant shield with a rattling sound, and from time to time arrows passed through the gaps between the giant shields, causing the Thunderbolt soldiers to let out a miserable scream.

It was the artillery that turned the tide of the war. The emergency erection of the Tiger Squat cannon caused panic in the hearts of the Mongols, and when several shells fell on the horses running at high speed, the Mongol cavalry finally retreated. They knew that the fighters had been lost in an instant, and it was not the best strategy to retreat to Dayi City and exhaust the men and horses in the defense of the city that they were not good at. Therefore, after a few long and short whistles, the Mongolian cavalry threw out a long hook and rope, caught the wounded soldiers and corpses in front of the Thunderbolt army and put them on empty horses, then turned around and rode straight towards Chengdu.