Ouyang Xuan, who arrived in a hurry, listened to the situation, listened to the analysis of Huang Dagen and other staff personnel, and fell into deep thought. Before he arrived at the General Staff, Huang Dagen had already sent people to various forts and cantonment points to warn, and sent people to Qiongzhou, Hengyuan Fort, and Pengshan City to transfer troops. On the second day of the first lunar month, after receiving the news of the Mongolian army's abnormal movements, the General Staff transferred the 1st Teaching Battalion to Guankou Village, and transferred most of the special brigade to Pengshan City. According to the analysis of the General Staff, the Mongolian army wants to break through the direction of the Jinma River, and the most likely is the direction of Guankouzhai-Daojiang County, where the river is narrow and shallow, and it is easier to cross the river in winter. The second is the direction of Pengshan City, during this time, Liu Heima trained the navy and built a lot of ships.

It was extremely difficult to move troops under the fog, because it was impossible to travel by boat or horse, so it was necessary to march on foot. The infantry battalion of the field brigade is stationed in Qiongzhou, which is about 150 li away from Sandushui, and the cavalry battalion is stationed in Baizhang County, which is more than 200 li, and it will take at least three days to reach it. The special brigade rushed back from Pengshan, and most of the road sections were not official roads, and it took longer to climb over mountains and wade through rivers. Although Yokohara Fort is only a few tens of miles, it can only mobilize a dissatisfied guard battalion at the moment. Although there are many garrisons in the direction of Guankou Village and their combat strength is strong, they do not dare to mobilize at all. Once the troops move south, it is very easy to fall for the plan of attacking the east and the west. If the Mongol cavalry crossed the river in this direction, the situation would be worse.

The naval brigade was unable to move due to the weather, the special brigade and the field brigade were far away and could not quench their thirst, the main force of the garrison brigade was pinned down in Guankou Village and could not move, and the urgently mobilized backbone militia company could not bear the heavy burden, which made it difficult for Huang Dagen and Ouyang Xuan. However, the war is like a fire, and it is clear that it cannot be allowed to develop. Once the Mongolian army takes the three crossings, there will definitely be a large number of reinforcements and even elite cavalry. Once the situation is like this, even if the main force of the Perak army arrives, it will turn into a war of attrition with huge casualties, and even the Chinese and Mongolian troops will encircle the point and send reinforcements. The people in the staff department knew that they had to find a way to annihilate the vanguard of the Mongolian army in Sandu Shuiwai Fort to prevent the subsequent Mongolian army from crossing the river.

"Why don't you let the second battalion go to stop the enemy", Yang Bangxian's words broke Ouyang Xuan's contemplation. After receiving the news of the Mongol army's change on the second day of the first lunar month, in order to avoid the loss of the second battalion, Ouyang Xuan transferred it to Anle Township, five miles outside the east gate of Chongqing Mansion. The reason for this transfer was that the General Staff judged that the direction of the Mongolian army's invasion was Guankou Village, which was not far from the garrison of the Second Teaching Battalion of Hengyuan Fort, and the Mongolian cavalry could arrive in half a day. If this valuable seed force suffers huge losses, it will seriously shake the foundation of cooperation between the Perak Army and the Miao Xinjiang and Yibo regions, and even break down the alliance relationship.

"Brother-in-law, don't you often say that the sword is sharpened, how can you become a strong army if you don't experience war? What's more, what is the difference between killing the Mongolian army in Banzhou and killing the Mongolian army in western Sichuan? Besides, teach the students of the second battalion to be elite soldiers before they come to Chongqing Mansion....." Yang Bangxian saw that Ouyang Xuan did not answer, and said in a hurry, and his tone couldn't help but improve a lot. In his opinion, the brother-in-law looked down on the combat effectiveness of the second battalion. Among the five companies of the second battalion, Miao Xinjiang cadets accounted for the majority, and the first company was Yang Bangxian's guard, so he concurrently served as the deputy battalion commander, and the battalion commander was concurrently served by the garrison brigade commander Zeng Yong.

Yang Bangxian's words on this also moved Ouyang Xuan. Seeing that Huang Dagen also nodded, he no longer hesitated and ordered: "I will soon summon the direct staff headquarters and the Fucheng guard battalion to accompany me to Sandushui." Bangxian, you go to the second battalion to gather your subordinates first, and after joining me, you will go to fight together. Huang Dagen and Yang Bangxian hurriedly took the order, and Ouyang Xuan returned to his residence to inform Yang Yan of the situation, he was really worried that Yang Yan would blame. Unexpectedly, Yang Yan was not angry but happy after hearing this: "The heads of my Yang family in previous generations are all people who lead the troops to fight, and although Bangxian is small, it is time to go to the battlefield to see it." Brother Xuan, don't worry, this kid has been very clever since he was a child. ”

When Ouyang Xuan led the army to leave the city, it was already dark, but the fog was thick and he couldn't ride his horse at all, so he had to march lightly. Due to the poor visibility, the muskets were greatly weakened, and the guns were bulky, so he did not order the two main battle weapons to be carried. A total of 1,000 people were reinforced, including 200 people directly under the General Staff Headquarters and 300 people from the Fucheng Guard Battalion, in addition to the 500 people from the 2nd Battalion. In addition to their swords, spears and shields, each of these soldiers carried five grenades with them, and the dozens of mules and horses at the back of the queue also carried a number of grenades and mines. In addition to these melee weapons, the soldiers from Miao Jiang also brought a lot of bows and crossbows. While Yang Bangxian was waiting for Ouyang Xuan, he also ordered the soldiers to smear the crossbow arrows with poison.

Chongqing Mansion City is about 20 miles away from Sandushui, and the forced army finally arrived at Sandushui Fortress at noon. At this time, although the dense fog has dispersed a lot, the visibility is still less than ten meters, and only the voices of people in the direction of the Jinma River can be heard, and the sound of killing on the side of the fortress is continuous, and there are occasional grenade explosions. The group couldn't take a breath, so Ouyang Xuan ordered Huang Dagen to lead his troops to disperse the Mongolian army by the river, and build a position to block the Mongolian army preparing to cross the river, and he and Bang Xian led the second battalion to recover the fortress.

Amid the shouts of killing and explosions, the second battalion quietly marched towards the outer fort city wall under the cover of thick fog. The Mongol Han troops who were besieging the inner fort did not realize that they were not friendly until the second battalion rushed to the gate. In their panic, they turned around, ready to work together to close the door. It is said that the gate of this fortress is covered with iron sheets, and after it is closed, it cannot be broken by non-heavy artillery. The company that rushed to the front would miss the opportunity to open the city gate, and they braved the rain of arrows to rush forward and throw grenades, although they were shot down by more than a dozen people, but they also threw several grenades in the city gate hole. After a burst of gunsmoke, more than a dozen Mongolian soldiers who were closing the city gate fell to the ground. In the narrow gate hole, where is there a place to hide?

Of course, the Mongol commander knew the importance of the city gates, and on the one hand, he constantly sent people to close the gates, and ordered the crossbowmen to stand on the city walls and fire arrows. It's just that the Thunderbolts are willing to let them close the city gate again, and keep throwing grenades into the city gate hole. The Mongolian archers could not see the Thunderbolt soldiers in the dense fog clearly, so they had to shoot blindly. After a few rounds, the Mongolian soldiers defending the city suffered more casualties, because bows and arrows were point kills, while grenades were surface kills, and a large area was blown up. What's more, the Perak soldiers lay in the thick fog and kept throwing grenades into the city gate, and the corpses of the Mongolian soldiers killed by the explosion have gathered into piles. Don't try to close the gates again without cleaning up the corpses. It's just that the Thunderbolts can't rush in, because the rain of arrows at the city gate is too dense.

The shouts and explosions in the direction of the outer fort made the Thunderbolt soldiers who were holding the inner fort cheer. After half a day of fighting, only a dozen of the original 30-odd soldiers were still fighting strength, and the deputy company commander who led the group was also dying of fatal arrow wounds, and his grenades and bullets were about to run out. The Mongol army did not want to completely destroy the fortress, but wanted to occupy it, so they did not use the method of arson. It was this greed that caused heavy casualties among the Mongol soldiers who attacked the inner fort and the arsenal. The doors of the inner fort and the arsenal were heavy and sturdy, and they were covered with iron sheets, which was a real problem for the Mongolian army without artillery. And the Thunderbolts in the inner fort will certainly not let them calmly break down, but constantly "warmly welcome" them with muskets and grenades.