Ouyang Xuan believed that Pu Xue's move to counterattack Chengdu by the troops of Sichuan in the Southern Song Dynasty was a major event to resist Mongolia, and this battle was not only related to the gains and losses of the entire Xichuan, but also had a great relationship with the future of the Thunderbolt Army, and it must not be left out of the matter. It's just that Wanjiazhai is in the northwest of Chongqing Mansion, and Xinjin City is in the southeast of Chongqing Mansion, which is at both ends of the narrow and narrow area of Chongqing Mansion. If you go to Xinjin Village in peacetime, you can take a boat down the Wenjing River in Hengyuan Village, and you can reach it in one day. However, since the Mongols took control of the Chongqing Fucheng Water Army Wharf, which was the only way for the waterway, the waterway was not feasible. And if you want to bypass the prefectures and counties occupied by the Mongols, the distance is too far, and it will take at least half a month. This is also the reason why the messenger team sent by the Pan Command chose to venture through the Mongol-controlled territory. There are enemy cavalry patrols on the official roads in the Mongol-controlled areas, but there are many rivers and muddy roads outside the official roads, and the paths are hidden and difficult to find, and it is easy to get lost. Just going to Xinjin City to contact, although the road is difficult and dangerous, it is a risk that has to be taken. Ouyang Xuan thought about it again and again, and decided that Dong Hu would lead people to Xinjin City to meet Pan Tong. In addition to Dong Hu's strong martial arts, he was also familiar with Pan Tong because he had been to Chongqing Mansion many times, and he often sent valuable mountain goods on behalf of the Thunderbolt Army, and more importantly, he did not show his face in the expulsion of Pan Luohuan, and he never had a grudge against the people of Chongqing Mansion.

Dong Hu, who received the task, found Le Quanan and asked him to tell the situation along the road in detail and draw a sketch of the path by hand. He did not take Le Quanan back when he went to Xinjin Village this time, in addition to the fact that his origin could not be proven, Le Quanan's body was also seriously overdrawn when he came, and he could not withstand high-intensity actions in a short period of time. Moreover, passing through the control area of the Mongols, the smaller the number of people, the smaller the chance of being discovered by the enemy's cavalry, so Dong Hu only picked four elite peers in the reconnaissance company, these four people are not only agile and strong in martial arts, but also quite skilled in the use of opponent Lei. In order to enhance the combat effectiveness of several people, Ouyang Xuan also asked them to bring a new type of grenade that had just been trial-produced by the research institute, but there were only two of them per person. The main difference between the new grenade and the old model is in the way of firing. The old model grenade needs to open the lid when using, light the fuse with fire and then throw it out, which is not only troublesome to use and has a high dud rate, but also takes longer to learn to use. The new type of grenade does not need to use fire, only need to open the lid and pull the fuse, which is detonated by the mercury inside the projectile, which is not only easy to use, but also greatly reduces the dud rate. It's just that due to the fact that granular black powder is still used, the charge has not increased, and the power is not much different from the original model grenade.

After Dong Hu went to Xinjin City, his position was temporarily represented by Huang Dagen. In order to cope with the changes in the situation, to know oneself and the enemy, and to be defeated in a hundred battles, the Perak army urgently needs to grasp the current situation information outside the mountain. The spies of the Perak Army were mostly in the nearby Yongkang, Hengyuan and other places, and they had very little information about the farther places, especially after the Mongols arrived, they also cut off contact with Chongqing and other places. According to Ouyang Xuan's arrangement, the internal guard battalion needed to send reconnaissance personnel to find out the information of the Mongols in the western Sichuan Plain within 200 miles from Wanjiazhai, which included more than ten prefectures and counties including Chengdu Prefecture, Chongqing Prefecture and Qiongzhou.

Although Dong Hu and his entourage of five people went to Xinjin City, there were also twists and turns, and it took a lot of time to hide and hide all the way, but they arrived at Xinjin City on the fourth day after departure. On the one hand, this is because the five of them are all from Orion and have a strong ability to survive in the wild, and on the other hand, they also benefit from the simple map drawn by Gen Le Quan'an, who helped the Mongolian army that escaped patrolling on the official road - this indirectly confirmed the identity of Le An'an's envoy's entourage, and Pan Tongzhi also confirmed that what he said was not false.

When Dong Hu saw Pan's rule, in addition to presenting letters from the Thunderbolt Army, he also presented mountain goods - leopard skins and deer antler velvet according to the old practice. It is estimated that because of the strength shown by the Thunderbolt Army after defeating the new annexed army, Pan Tongzhi treated Dong Hu and his party politely this time, and also promised Ouyang Xuan's idea of taking Yongkang City first and then attacking Chongqing Mansion City together. When asked about the details of the defeat of the new annexed army, Pan Tongzhi praised the thunderbolt weapons and sighed that Ouyang Xuan was the pillar of the country, and finally asked about the production methods of grenades and artillery. After Dong Hu was silent for a while, he deduced that the method of making firearms was personally taught by Ouyang Xuan to the craftsmen, and his party did not know, but he was willing to present some of the grenades he carried with him to Pan Tong for the craftsmen of Xinjinzhai to imitate. Seeing that Dong Hu was reasonable, Pan did not suspect it, but only said that after the traffic was smooth, he would let the Perak army send some artillery and craftsmen, and let the Chongqing Mansion army also be equipped with such sharp weapons.

Dong Hu has a natural acumen for military affairs, which is why Ouyang Xuan chose him as the intelligence leader of the Thunderbolt Army. By walking around and wandering, he was able to get a clear picture of the situation in Xinjin City in a short period of time. This Xinjin City is located at the confluence of the three major rivers of Nanhe, Wenjing River and Jinma River, the main stream of the Minjiang River, and firmly guards the waterway of the western Sichuan Mengjun army to Meizhou and Jiading Mansion in the south, and the geographical location is extremely important. In addition to Xinjin City surrounded by water on three sides, the river is wide and deep, and it is extremely easy to defend and difficult to attack, but also stationed a strong naval army in this place.

The Mongol army was not good at water warfare and could only attack from land, but it was blocked by the tall city walls. Moreover, the moat of Xinjin City is more than ten zhang wide, and it is connected with the river channel around the city, and the Mongolian army will be attacked by the naval forces on both sides when attacking the city wall from the land, and the siege equipment is repeatedly destroyed by the ballistas and trebuchets on the ships of the navy, so they have to retreat. The Mongol army could not take Xinjin City, so they could only make a detour to attack Meizhou and Jiading Mansion downstream. It's just that the pressure of land transportation is too great, and the naval army of Xinjin City and Pengshan City downstream uses the waterway of the Minjiang River in all directions to attack logistics, so that the Mongolian army's attack on Meizhou and Jiading Mansion has also been repeatedly frustrated.

In the boast of Pan's command, he recently commanded the Xinjin City Navy to go up the river and attack Qiongzhou, Dayi, Wenjiang, Pixian, Qingshen, Daojiang, Yizheng and other prefectures and counties along the river. Listening to Pan's statement, Dong Hu disagreed, he knew that maybe the naval army would succeed in a sneak attack, but it was difficult for the infantry army to hold the city, because according to his observation, the combat effectiveness of the Xinjinzhai infantry army was not much stronger than that of the new annex army that invaded the mountains, because he did not understand the water war and could not evaluate the combat strength of the naval army. What's more, even he, an outsider, can faintly see the discord between the infantry and the infantry army. Xinjinzhai now has 2,000 infantry troops and 1,000 naval troops. The infantry army was mainly brought from Chongqing Mansion by Pan Tong, and the generals under his command were all his henchmen. Chongqing Mansion originally had 3,000 people, and when Pan Tong retreated, he left behind 1,000 old and weak soldiers and occasionally disobedient generals to defend the city, but those who were abandoned were willing to defend to the death, either fled and became bandits or surrendered to the Mongol army. The navy army was the original garrison of Xinjin City, although it was nominally under the command of Pan, but it was in its own right. The navy originally had 1,500 people, but under the command of Pan, it was broken by a third in several battles, and even the original commander of the navy was killed. Pan Tongzhi took the opportunity to let Pan Luohuan go to be the commander of the navy, and this gentleman made people angry and resentful within a few days, which made the sailor soldiers more and more detached, which attracted the doubling of the suppression of Pan's commandery.