The stone gate pass is close to the mountain and the water, and its builder uses the method of burning the stone and the water to cut a road between the boulders of the mountain to form the stone gate. This is a "one husband is a pass, ten thousand people are not open" dangerous pass, firmly guarding the "five-foot road" from Sichuan to Dali. After taking Xuzhou City, Zan Wanshou ordered the special battalion and reconnaissance battalion to go up the Nanguang River, a tributary of the Mahu River (Jinsha River), under the escort of the naval brigade, and arrived at Shimenzhai five days later. In order to protect Shimen Pass, the Song army established Shimen Village here and garrisoned 500 troops. Don't underestimate these 500 people, as long as the food and grass are sufficient, even if the enemy's army comes to attack, it is not a problem to defend it for a year and a half. In less than a month, reinforcements from the Song army will arrive in a steady stream from all over the country.

Liu Quan's rebellion opened the door of this dangerous pass to the Mongolian army, but its surrender to Mongolia was too sudden, and the Mongolian army of Dali did not have time to mobilize troops to attack Sichuan, and only sent the Mongolian army stationed in Shimen Pass to aid Xuzhou. To the surprise of the Mongolian army, the Thunderbolt army reacted very quickly, not only seizing Xuzhou in a short time, but also rushing towards Shimen Village. The Mongolian army and the white barbarian soldiers who fled from Xuzhou City did not bring much grain and grass because they were in a hurry, so they robbed the defenders of the grain and grass in Shimen Village under hunger, and then left. Before leaving, they did not tell the defenders of Shimenzhai about the situation in Xuzhou City. Although the new annexed army of Shimenzhai resented the domineering of the Mongolian army, it was helpless. On the one hand, the Mongolian army is too emperor, not for them to provoke, on the other hand, the defense of Shimen Village and Shimen Pass is built in the direction of Dali, and it is powerless to deal with the attack from the direction of Xuzhou.

The first to arrive at Shimen Village was the cavalry led by Ah Yongqin. Du Zhangman lost 300 people in the battle of Xuzhou, and there were still 1,700 people in his eyes, of which the cavalry did not suffer much loss, and there were still more than 260 horsemen. In order to quickly take Shimenzhai, Zan Shou selected a few generals from the surrendered Xuzhou New Annexed Army, and sent a platoon of cavalry from the Perak Army to try to recruit the defenders of Shimenzhai. Sending a platoon of cavalry to accompany him was to facilitate communication and contact, in case of accidental injuries in battle with friendly troops, which was a common thing, but in Ayong's eyes, the Thunderbolt army was still not at ease with the command, and these cavalry were sent to supervise the army. To say that Zan Wanshou's treatment of the conditions offered by Du Zhang's subordinates is not like treating the defeated party, but has great favors, and it is far better than the oppressive terms of the Mongolian army, which makes Ah Yong feel more and more uneasy. In a panic, he asked to see Zan Wanshou before leaving, and took the initiative to ask to keep 200 hostages in Thunderbolt, all of whom were the sons and nephews or relatives of the heads of the cottages and the owners of the villages. Zan Wanshou saw that he was anxious, and agreed with a little groaning. He told Ayong that the 200 men were not hostages, but would be sent to Chongqing Mansion to learn about politics, economics, culture, and medicine.

The five-foot road leading to Shimen Village in Xuzhou, so the name suggests, its width is only about one meter five to two meters, most of them are opened up by the mountain, paved by stones, such a road is not suitable for longitudinal horses. Although the 300 people led by Ah Yong were all cavalry, they could not move fast because they could only lead the horses, so they hurried along the way and did not catch up with the fleeing Mongolian army. Only dozens of Mongolian soldiers who fell behind were captured. For these captured Mongolian soldiers, Ayong ordered to kill them directly, and when the accompanying Perak platoon commander learned of this, he saw that those Mongolian soldiers had turned into bloody heads hanging on the side of the road. Ayong did this, on the one hand, he hated the betrayal of the Mongol army for sneaking away, and used the Duzhang tribe as cannon fodder, and on the other hand, because marching with these captives would slow down the pace. More importantly, in this way, he wanted to show that he was determined to reconcile with the Mongolian army, so that the accompanying Perak soldiers could be completely reassured.

The defenders of Shimenzhai were simply stunned during this time. First, Liu Cheng surrendered to Mongolia and caught them off guard, and then at the request of his boss, he put the Mongolian army and the white barbarian soldiers of Dali who had been killed and alive for many years into the pass, and watched them swarm through the checkpoint and pour into the Han land. Unexpectedly, in less than a month, those Mongolian troops and white barbarian soldiers hurriedly withdrew from Xuzhou, and retreated to Dali through the pass without looking back. Now those barbarian soldiers have come with people to persuade them to surrender, claiming that the city of Xuzhou has surrendered to the Thunderbolt army. The general who guarded the village could see clearly, and there were a few familiar faces among the people who persuaded him to surrender, and he vaguely remembered that it was the general of Xuzhou City. It's just that things are really weird during this time, a month ago the enemy was in charge of the barbarians and became allies, and now they claim to have surrendered to the Thunderbolt army, which makes the heads of the defenders of Shimenzhai big, and they can't figure out the relationship at all. The Mongolian army and the white barbarian army that passed by yesterday rushed into the village to grab food, which made the defenders more wary of the so-called "friendly army" of Duzhangman. In their opinion, the so-called accompanying Thunderbolt army and Xuzhou army generals were coerced by these brute soldiers.

No matter how the Xuzhou generals and the Perak soldiers shouted, the defenders of Shimen Village just wouldn't open the door. Ayong was angry but helpless, so he had to wait patiently for reinforcements to arrive. Although the focus of Shimenzhai's defense is in the direction of Dali, and the defense in the direction of Xuzhou is not strong, it is not something that 300 cavalry can capture. Two days later, the follow-up 1,200 Duzhang barbarians arrived one after another, and Ah Yong ordered people to build siege equipment to prepare for the siege. The Perak army fleet that took the waterway was tracing the water, and there were dangerous shoals in many places that needed to be pulled upward, so it took another three days for the fleet to arrive at Shimen Village. The commander of the Perak platoon who accompanied Ah Yong immediately contacted the fleet, and after Hou Xing, the deputy division commander of the Perak Army, who led the team, asked about the situation, he sent someone to recruit him to surrender, but unsurprisingly he was rejected again. Hou Xing had no choice but to order preparations for the siege of the city and prepare to seize Shimenzhai by force.

The concentrated fire of the warship artillery quickly destroyed the fortifications and outposts on the periphery, but because Shimen Village was located on a high hill and some distance from Nanguangshui, the shells could not hit the core of the village. It's just that after a few rounds of artillery, the defenders of Shimen Village still opened the gate and surrendered. On the one hand, the powerful artillery ships proved that the army in the river below was undoubtedly the Thunderbolt army, and the Thunderbolt army was the staunchest anti-Mongolian faction. After all, the Mongol army has invaded Sichuan for 19 years, slaughtering countless Sichuan people, and many soldiers have a deep blood feud with the Mongols. On the other hand, it is also because the situation is pressing. Not to mention the warships in the river, there were more than 1,000 Thunderbolts who disembarked and prepared for foot battle, plus the 1,500 men were all in charge of the barbarians, which was five times the number of the defenders, and it was impossible to hold the stockade under the artillery.

"Those who know affairs are Junjie", those guards of the army accompanied Liu Cheng to surrender to Mongolia, but they just went with the flow in order to survive, and the few diehards who resisted were also tied up by the defenders as a surrender. After taking Shimen Pass, Hou Xing sent a special battalion to temporarily garrison this place, and sent people to move more than a dozen cannons from the ship and place them on the pass. The 500 surrendered new annexes, except for 200 people selected to assist in guarding the pass, the rest of them will be escorted back to Xuzhou City by the navy, and what awaits them will be further screening. As for the reconnaissance battalion, the reconnaissance battalion will continue to pursue the Mongol army through Shimen Pass with Ah Yong, and wait for an opportunity to open the road to Liupanshui and Dongchuan County in Miaojiang. Needless to say, the importance of the copper mines in Dongchuan County is self-evident, and Liupanshui is the most important base for Banzhou to enter Dali Kingdom.