After taking Shimen Pass, Zan Wanshou did not immediately lead the army to Luzhou, but sent infantry and naval troops to recover the counties and forts around Xuzhou, and the cavalry went to Anyi, Meidong, and Wuning under the Changning Army two hundred miles away, and Anyuan, Banqiao, Meiling and other forts under the jurisdiction of Luzhou Prefecture, which were not only important fulcrums to prevent the Mongol army from attacking Sichuan from the direction of Dali and Miaojiang, but also to prevent the rebellion of the servants, servants, wingmen and other tribes in the region. Not long after the garrisons of these military villages were attached to the Mongolian army with Liu Quan, they were still thinking about Song, so under the pressure of the Perak army, the accompanying Xuzhou generals and colonels surrendered one after another as soon as they shouted.

Within half a month, all the Xuzhou and Changning armies, as well as the counties and forts in the southwest of Luzhou, were controlled by the Thunderbolt army. For these surrendered troops, Zan Wanshou was classified and disposed of in accordance with the established principles of the Thunderbolt Army. First, for the soldiers who were identified as diehard members of the Mongolian army and stained with the blood of the common people, they were convicted and sentenced according to the situation; The second is to select a number of outstanding officers and soldiers to study at the military academy in Chongqing Prefecture; The third is to eliminate the old, weak, sick and disabled soldiers, and give money and grain to be transferred to the cantonment on the spot. In addition to the above three parts, the soldiers will be temporarily retained, and the officers at all levels will be assigned to serve as the backbone of the Third Division, and the original officers will be deputies.

Due to the rampant corruption within the Song army, these soldiers used to live in a very difficult life, but after joining the Perak army, both equipment and treatment were much better than the original, and they were well fed and warmly clothed, and there were doctors when they were sick. Although it will take some time for the money, food, and equipment to arrive, at least there is hope for the future, so most of the troops surrendered to the Thunderbolt army policy are not resistant, but very happy.

After stabilizing the morale of the army and strengthening the defense line in the direction of Dali and Miaojiang, Zan Wanshou ordered people to invite the leaders of the surrounding Yi people, servants, servants, bureaucrats and other tribes to come to the council. These tribes are also very poor like the Duzhang tribes, and it is inevitable that they will do some murderous and overselling things, and they don't want to go to Xuzhou. It's just that the barbarian soldiers who accompanied the envoys were both soft and hard to these tribes, swearing that the Han official who entered Xuzhou this time was a good official, and that if he didn't go, he would be bombarded by the thunder - the thunderbolt weapons are now called the thunder by the tribes. Seeing that the people who had been rampant on one side were also in charge, these tribes sent people to attend the meeting in fear. The Thunderbolt Army's approach in Miao Jiang was very successful, and Zan Wanshou did the same, which made all parties in the alliance happy. The Thunderbolts will sell a large number of necessities such as grain, cloth, ironware, and salt, and will also help talents in education, medical care, and agricultural technology, while the tribes will only pay for resources such as mines that they cannot afford to exploit.

The worries were completely solved, and the time was already in August, and Zan Wanshou led the army to the direction of Luzhou. In addition to the two naval brigades, there were only special battalions that accompanied him to Luzhou this time, not only because of the insufficient transportation capacity of ships, but also because of orders from the General Staff. The General Staff believed that the capture of Luzhou Shenjian City would be the first joint battle between Banzhou and the Perak Army, and that the warships of the Perak Navy Army could completely suppress Shenjian City and provide fire support for the siege of Banzhou soldiers. As for the absolute main cavalry brigade and two infantry brigades of the third division, they were led by Hou Xing and remained in Xuzhou City to wait for the next order from the General Staff. Yang Wen had already written to Ouyang Xuan, requesting that in the joint operation of attacking Shenjian City, the Banzhou army should attack the city. Ouyang Xuan understood that his father-in-law wanted to stabilize his rule over Banzhou and Miaojiang through war, and cultivate and temper Yang Bangxian, the heir. In Yang Wen's view, as long as there is the support of the powerful artillery warships of the Perak Army, the Banzhou Army can retreat even if the siege does not go well.

Just when Zan Wanshou attacked Xuzhou, the battle situation in Luzhou City was undergoing major changes. Although Yu Xing was extremely corrupt, he also had a strategy in battle, and this time he mobilized many elite Song troops from northern Sichuan and eastern Sichuan to participate in the battle, with nearly 20,000 people. Although there are more than 20,000 soldiers in the Tongchuan Mansion Road under Liu Quan's jurisdiction, a considerable part of them are stationed in various prefectures and counties, and there are more than 5,000 people in Xuzhou and Changning alone who were wiped out and absorbed by the Thunderbolt Army, and the garrison in Shenjian City is only 3,000 people. Although Liu Quan was brave and good at fighting, the army led by Yu Xing far surpassed him in terms of number and combat strength, and if it weren't for the fact that Shenjian City was easy to defend and difficult to attack, he would have been defeated and died. Liu Quan had to support him with a hard time, and a faction sent the dead to sneak out of the city and go to Jianzhou to ask Liu Heima for help. Rescuing Liu Cheng at any cost was an order personally issued by Kublai Khan, and his son Liu Yuanzhen was assisting in defending the city in the Divine Arm City at this time, so Liu Heima was of course going all out.

Under the constant urging of Liu Heima, Niu Ling went to aid Luzhou with a large army, with a total of 3,000 cavalry, 5,000 Mongolian Han infantry and 7,000 new annexed troops, which was very powerful. In addition to the strength of the headquarters of Niu Xuan, the rest of these troops came from Liu Heima and Baijianu, and even many from northern and eastern Sichuan. Because of the weakness of the Mongolian army, the New Brothers did not dare to take the waterway, which was more convenient for the transportation of grain, grass and baggage, so they had to take the land route where the march was slower. In the face of the continuous urging from Jianzhou and the urgent report in the direction of Luzhou, he sent his general to lead 2,000 cavalry as the vanguard and hurried to the aid of Shenjian City.

After Yu Xing learned the news of the arrival of the New Gang army, on the one hand, he sent the commanders Zhang Gui and Jin Wende to lead the army to garrison the mouse pass on the official road from Jianzhou to Luzhou to block the reinforcement of the Mongolian army, and on the other hand, he ordered people to attack Shenjian City urgently. The city is surrounded by water on three sides, with steep shore walls, and only the east gate is flat and suitable for siege. Under the bombardment of hundreds of trebuchets and ballistas, the defenders suffered heavy casualties. The closest the Song army came to breaking the city was when it had captured the triple gate of the east gate, but when it first broke into the city, it was repelled by Liu Cheng and Liu Yuanzhen's personal army. To say that these two people are also brave, they are wounded in many places all over their bodies and still fight to the death. Seeing that the main general was like this, the morale of the defenders suddenly soared, and a counter-charge drove the Song army away and recaptured the east gate.

Although the Rat Pass is easy to defend and difficult to attack, it is not the only way from Jian and Zizhou to Shenjian City. After Liu Chuan surrendered, his henchmen stationed in Fushun Jian also followed him to surrender the Mongol army, and under the leadership of these traitors, he sent people to bypass the mouse pass through the trail and suddenly appeared in the rear of the pass. The Song army, which was stationed by surprise, was defeated, and Zhang Gui and Jin Wende died in battle. Yu Xing, who learned that the Mouse Pass had fallen, was shocked, and hurriedly dispatched Dutong Tunda to block the attack, relying on the advantages of the terrain to block the Mongolian army, and the two sides were deadlocked from morning to afternoon, but the Song army was also declining day by day. Yu Xing had no choice but to continue to send men and horses from the siege of Shenjian City to aid Tunda. He took advantage of the chaos of the Song army's mobilization of troops and horses to send elite soldiers out of the city from the secret passage to raid the rear of the Song army besieging the city at the east gate, and he led the soldiers and horses in the city to attack the besieging Song army from the front.

Caught off guard, the Song army besieging Shenjian City was defeated, and Yu Xing saw that the situation was not good, so he seized the small boat on the shore and fled to the Huangshi camp on the south bank. When the Song soldiers saw the commander fleeing, they also scattered and fled. Dutong Tunda, who was fighting fiercely with Lost Lida, heard that Yu Xing had fled, and even left his troops to flee, and he ran all the way to the river, seeing that there were no boats, so in a hurry, he pushed his mount into the water, and grabbed the tail of the war horse and floated to the south bank of the river. The so-called "defeat is like a mountain", seeing that the commander and the generals have fled, the Song soldiers also fled one after another, and jumped into the water under the pressure of the pursuing Mongolian cavalry, most of them drowned in the river. After Yu Xing fled back to Chongqing, he counted the remnants of the army, and found that only about 3,000 people had returned with 20,000 soldiers.