Although the commander of the Mongol army in the outer fort did not know how many people the Thunderbolt army came, he had to leave a few dozen people to contain the inner fort, and the rest of the troops were thrown on the city wall to deal with the reinforcements. Anyway, this inner castle is about to be taken, and I am really unwilling to let it go now. The Mongol army in the outer fort originally had 500 men, but lost dozens of people when raiding the outer fort, and dozens of people were killed and wounded when attacking the inner fort, and there are still about 400 people. The Sandu Water Fortress is not large, and in the eyes of the commander of the Mongolian army, as long as the other side does not have artillery, it is not difficult to hold it. In fact, his judgment was not wrong, if the second battalion attacked strongly, it would be impossible to capture the outer fort.

Time is not on the Thunderbolts' side. As long as the Mongolian army persists until the reinforcements arrive, the thousand people led by Ouyang Xuan, with neither artillery nor naval support, will definitely not be able to withstand the onslaught of the Mongolian cavalry. At that moment, Ouyang Xuan asked Bang Xian to lead 400 soldiers to strengthen the offensive at the gate to attract the firepower of the Mongolian army, and he himself took 100 people to attack around the side of the fortress. This strategy really worked, Yang Bangxian asked the shield-wielding soldiers to line up in a fish-scale formation and slowly move forward, and the soldiers behind shouted in unison, attracting most of the defenders to the city gate. In the midst of the noise, Ouyang Xuan commanded the soldiers to suddenly burst out of the dense fog and attack the side wall.

After a round of grenades, the Mongolian soldiers on the side walls became more sparse. Whether it is a Miao Jiang or a Yibo soldier, they have lived in steep mountainous areas since they were children, and it is natural to climb the wall. At that moment, they threw ropes with hooks, and climbed the wall five or six meters high with the ease of apes. On the side wall, the Mongol army was dazed by the sudden grenade explosion and suppressed by the short crossbow, and was unable to organize effective resistance at all. As more and more Thunderbolt soldiers climbed the city wall, the grenade explosions became more and more intensive, and it was not long before the Mongolian troops on the side walls were cleared.

Yang Bangxian saw that Ouyang Xuan had succeeded, so he left one company to continue to block the city gate hole, and he took three companies to the side wall. When the commander of the Mongolian army saw that the side wall was lost, he organized his personnel to counterattack. It's just that the width of the city wall is only a few meters, and a grenade can seal the offensive passage, not to mention that the Mongolian army will face a dozen or more grenades in a single charge. Ouyang Xuan ordered not to save grenades, there were more than 300 grenades for the 100 people he led, more than 1,000 for the three companies led by Yang Bangxian, and not far behind the Thunderbolt army blocked at the city gate, there were dozens of mules and horses carrying more grenades. This time, Ouyang Xuan brought all the grenades from the Thunderbolt Army Headquarters and the Chongqing Mansion.

Before Yang Bangxian and his men all climbed the walls of the outer fort, the Mongolian troops inside the fort panicked. Previously they were afraid that the Thunderbolts would storm the fort, but now they were in a hurry to rush out. It's just that grenades and short crossbows are really sharp weapons in close combat, turning the city gate hole into a death trap. After several rounds of charges, the corpses of the dead Mongolian soldiers even formed a low wall in front of the city gate. In the face of the continuous falling grenades and crossbow arrows at the head of the city wall, these Mongol and Han troops could not hide between the inner and outer forts, which were not wide, and they could not rush out, so they simply dropped their weapons and knelt on the ground and surrendered.

The Sandu Water Fort is only about 200 meters away from the bank of the Jinma River. At the same time that Ouyang Xuan and Yang Bangxian attacked the fortress, Huang Dagen also led his troops to launch a sneak attack on the Mongolian army by the Jinma River. At this time, by the Jinma River, like a pot of boiling water, there were Mongolian army officers shouting reprimands, there were horns moving heavy objects, there were also miserable cries of people, and there was a faint neighing of war horses on the other side of the river. Amid the noisy noise of people and horses, the Thunderbolts opened the way with grenades, and with lightning speed, they caught the Mongolian troops on the west bank of the river by surprise, and drove them to the beach of the river like a sheep.

The fog was a double-edged sword, allowing the Mongol army to successfully attack the fortress and the Thunderbolt army to sneak attack the Mongol army. It is said that in order to prevent the Thunderbolt army from coming to help, the Mongolian army had early warning posts around the Sandushui Fortress, but these people were killed by the top soldiers of the second battalion. The Yibo soldiers who served as the top soldiers were the elite of the elite, and they were extremely good at hunting and individual combat. Of course, this is also because the Mongolian army did not expect the Thunderbolt army to react so quickly. The commander of the Mongolian army believed that the infantry would need a day at the fastest in this foggy weather to come to the aid from Chongqing Fucheng and Jiangyuan County. Of course, the cavalry was faster, but the sound of horses' hooves could be heard from afar, so there would naturally be plenty of time to be on guard.

In addition to the 500 Mongol troops who occupied the Sandushui fortress, there were 200 Mongol troops guarding the west bank of the Jinma River, 500 Mongol soldiers and men digging in the river beach and building pontoon bridges, and 500 Mongol Han troops and 1,000 men transporting supplies on the east bank of the river, as well as 200 cavalrymen. Although the Mongolian army was taken by surprise, it quickly organized a counteroffensive, and now the pontoon bridge is about to be erected, and a large number of Mongolian troops gathered in Wenjiang City are coming. Although the fog was wide and the vision was blurred, the Mongolian army also judged from the shouts of killing that the number of the Thunderbolt army was not large. In the eyes of the Mongolian commander, the advantage is mine, and I only need to rush forward, even if I suffer heavy casualties, I can win by relying on the superiority in numbers.

It's just that at this time, Huang Dagen has led his troops to firmly occupy the river embankment. In this dry season, although most of the Jinma River has dried up, forming a vast river beach that is hundreds of meters long and can accommodate thousands of Mongolian soldiers, there are only a few places where they can go ashore, and the rest are either steep banks that cannot be climbed, or swamps with mud up to knees deep. The Thunderbolts took firm control of these embankments, threw grenades condescendingly, and even planted mines in the river between the Mongol attacks.

The Mongol army attacked several times, but found that it could not rush to the river bank at all. The cobblestones on the river beach were also stained with blood due to heavy casualties, making it very slippery, making the subsequent attack even more difficult. It's just that the Mongolian generals still refuse to give up, because at this time the fog has gradually dissipated, and after the field of vision becomes broader, the speed of reinforcements will inevitably increase. When the reinforcements from Wenjiang City arrive, the Thunderbolt army will inevitably be defeated after joining forces. The 3,000 elite iron horsemen from Chengdu and Pengzhou are also on the way, and they will arrive soon. As long as these 3,000 cavalry crossed the river, the Thunderbolt army could not resist it in the field.

It's just that "the ideal is very plump, and the reality is very skinny". Just as the Mongol army was in high spirits and preparing to attack again, a series of huge artillery sounds were heard from the direction of the fortress. After recapturing the Sandushui Fortress, Ouyang Xuan immediately ordered Yang Bangxian to go to the river embankment for reinforcements, and ordered the cannon in the arsenal to be pushed onto the gun emplacement to prepare for firing. It's just that most of the guards of the fortress were killed in battle, and most of the gunners were killed or wounded, and the soldiers of the second battalion had not yet learned to shell, and no one knew how to operate those guns. He had no choice but to send people to the river embankment and ordered Huang Dagen to send gunners back to the fortress. Fortunately, there were many gunners in the defenders of Chongqing Mansion and the companies directly under the General Staff, and the firing of the artillery of the Sandushui Fortress had already been set, so it could be fired directly.

Twelve heavy guns opened fire one after another, some of which landed on the assembled Mongol troops on the east bank of the river, while others landed on the pontoon bridge. After several rounds of shelling, the banks of the river were full of dead bodies, the freshly erected pontoon bridge was destroyed, and a large number of soldiers and people were scurrying around the riverbank. Seeing all this in the secret fire that had just arrived from Wenjiang City, he couldn't help but think of the scene of the battle of Yokohara Fort. A cold wind blew, making him shiver in a leather robe. He then turned his horse and turned to leave, and the rest of the Mongolian army also followed away in disgrace.