After the autumn harvest, a large number of Mongolian scouts frequently broke into western Sichuan to reconnoitre, in addition to Liu Heima, he also frequently used 100 cavalry as a scale to test the fortresses and outposts along the river of the Thunderbolt army. In response to this, the General Staff ordered all divisions to strengthen their alert and patrols, and ordered the Thunderbolt cavalry to go for reinforcements. The Mongolian hundred-man cavalry team ran up, and the smoke and dust were so loud that they couldn't hide their itinerary at all. At present, although the warships are inconvenient to move in the dry season, after the dredging and excavation of the Thunderbolt Army, there are not many sections of the river that can easily wade through the water. Therefore, in front of the Thunderbolt army, with the fort as the lock and the river as the chain, these hundred-man cavalry often returned in vain.

The ten-man Mongol scouts crossed the river in inflatable sheepskin bags from secluded places. The border between western Sichuan and the occupied areas of the Mongolian army is hundreds of miles, and it is impossible to prevent the infiltration of these scouts, so they have entered more than a dozen teams. These scouts are small in size, large in number, light and fast, and come and go like the wind, it is easy to prevent them from attacking, but it is too difficult to catch them. They do not kill, they do not set fires, they avoid people, their whereabouts are erratic, and they run away after they have finished scouting. When the Thunderbolt cavalry arrived, they were nowhere to be seen. The divisions also set up ambushes near major communication routes and military strongholds to lure them to come and reconnoitre, but the Mongol scouts were the elite of the long-term war, and they fled when the wind and grass were blowing. The Thunderbolts spent a lot of effort, but only killed and wounded a few dozen people.

After the winter, Liu Heima dispatched thousands of new army infantry to approach Jintang County and Genting City, and formed a confrontation with the defenders of the Thunderbolt Army in the two cities. In fact, he knew that Genting City was extremely easy to defend and difficult to attack, especially since the heavy fortress guns had been installed at the moment. Although the water level of the Tuo River next to Jintang City has dropped a lot, the Thunderbolt gunboats are still able to move. With the firepower of artillery warships, it was basically impossible for the Mongol army to take Jintang County, even if the Thunderbolt army in Jintang City only had 500 defenders. Even ordinary Mongolian soldiers know these situations, how can Liu Heima not know? Although the dry water in winter brought great inconvenience to the movement of the Perak warships, especially in Pengzhou and Hanzhou, which are located in the upper reaches of the Min River, and many places have been unable to sail, the main rivers of the Tuojiang River system below Deyang County and the Minjiang River system below Chengdu Prefecture, the Thunderbolt Army's warships are still unimpeded.

In order for the Mongols to attack the Perak army, they had to cross the Min River in the Chengdu and Jiading sections and the Tuo River in Hanzhou. Chengdu and Jiading are protected by naval forces, close to Chongqing Mansion, convenient for logistics and supply, and have castles such as Genting City and Three Turtles and Nine Peaks as barriers, and the Mongolian army lacking a naval army cannot cross the river at all, which is obviously not a suitable direction for breakthrough. Therefore, Liu Heima's strategy was to attract the main force of the Perak army in the direction of Genting City, Chengdu Mansion and Jiading Mansion, and the new annexed army of Yang Wen'an's Ministry attacked and established a bridgehead in the shallow part of the Mianyuan River in the upper reaches of the Tuojiang River, so as to establish an advance base for the subsequent Mongol cavalry to raid the hinterland of the Perak army. According to the return of the reconnaissance horse, Liu Heima decided to use the upper reaches of the Mianyuan River, twenty miles northwest of Mianzhu City, as a breakthrough. The terrain of the river here is remote, far from the center of the Perak army, and the water flow is relatively shallow, and there are three ferries, which is an excellent ferry for breakthrough. This is the ferry where Yang Sanwa and Li Laosi are guarded by the platoon.

The Mongolian army had enough of the Thunderbolt artillery, and knew that the casualties of the strong attack were huge, so they adopted the tactics of sneak attack, trying to replicate the experience of sneak attack on the three water crossings, but they were defeated by Yang Sanwa and Li Laosi. To say that the leader of this sneak attack is Yang Wen'an's henchman, and his leaders are all the elite of the new attached army, no matter from that point of view, with 300 people against 30 people, how can it be invincible? What these new annexes don't understand is that times have changed, and the rules of the battlefield have changed due to Ouyang Xuan's appearance. Not to mention that the sneak attack on Sandu Water was foggy and the defenders were slack during the Spring Festival, so they were able to get away with it. Even under the same conditions, it will be difficult for the Mongol army to succeed this time, because the Thunderbolt army has planted a lot of mines under the fortress walls, and the Mongol army will explode as soon as it approaches.

When Yang Wenan arrived at this nameless ferry, it was already dark. He looked at the thousands of men and horses under his command - the brigade was still coming, and then looked at the small fortress on the other side of the river, which was only about an acre, and the sparse Thunderbolt soldiers stood on the fortress wall, and there were only more than a hundred Thunderbolt cavalry behind the fortress, and his heart suddenly became angry. He immediately pointed at the river water that was only more than ten meters away with a horsewhip and angrily shouted at the henchman junior colonel: "If you can't take the fortress on the other side of the river, you will use your head to sacrifice the flag." In his opinion, he has thousands of troops and can't take a small fort, how can he gain a foothold in the Mongolian army, and how can he win high-ranking officials?

The 300 men led by this colonel were demoralized during the night attack, but now that the reinforcements have arrived, and they have brought a lot of armor and armor, their confidence has regained a little. Yang Wenan lost no time in promising to be promoted to make a fortune, and if he couldn't take the fortress, his head would fall to the ground, so these soldiers screamed again. They were divided into two routes, one of which was to wade directly across the river in front of the fort, and the other half a mile below the fort, with a total of 500 men on both sides. As for the section of the river half a mile above the fort, it was impossible to get close to, let alone cross, because the fire in the grove was raging and the heat was scorching. The Mongols had already cut down a number of trees, which could be used to build pontoon bridges and attack forts.

As soon as the soldiers of the new annexed army rushed into range, the Thunderbolt artillery on the fort rang out. The shotgun flew over, and there was a large area on the ground. It's just that the number of new annexed troops is too large and they rush fast, so hundreds of soldiers of the new annexed army rushed down the river embankment, ran across the river beach and rushed straight to the river, ready to cross the river. Although the river surface of more than ten meters is not wide, it also makes the momentum of the charge stagnant. At this moment, the second round of artillery rang out again, and the new annex soldiers who were wading in the water fell again, and in an instant the surface of the river was stained crimson with blood. The new annexes who attacked the front of the fort were okay, the water was only thigh-deep, and the lightly wounded could barely climb up the river beach. The new annexes who waded from the lower reaches of the fort were unlucky, for the water was chest-deep and the current was so fast that the lightly wounded were swept away in no time. Even many of the new annexes fell into the rapids under the frightening of the artillery, and the pebbles at the bottom of the river were slippery and uneven, making it difficult to walk.

After resisting three rounds of artillery, the soldiers of the new annex had rushed to the vicinity of the fortress wall, and by this time they had already lost more than a hundred men. The Thunderbolts had only two light fortified guns in the fort, but after Huang Dagen inspected the defenses of the place, they approved three more light rapid-fire guns. The Thunderbolt army expanded too quickly, and the western Sichuan front was thousands of miles long, and it was rare for this fortress, which was only more than one acre large, to have five guns. And these five cannons can kill and wound more than 100 enemies in three rounds, which is really a remarkable result, of course, this is also related to the dense formation of the new attached army. It's just that after three rounds of cannons, the artillery on the fortress wall can no longer shoot these new annex soldiers who have reached the nearest place due to the firing range and angle problems, so they can only keep throwing grenades down. The new annexes under the fort used their shields to pull out grenades and suppressed the walls with dense bows and crossbows, inflicting casualties on the Thunderbolt soldiers.