The failure of the attack on Yuyuan Pass was not a heavy blow to Sun Xiu, this northern expedition, Sun Xiu was originally full of ambition and confidence, as long as he won in this battle, Sun Xiu's status in Wu will definitely be greatly improved. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

But the reality is extremely cruel, in the first battle of Yuyuan Pass, Sun Xiu was almost wiped out and suffered a devastating blow, which made Sun Xiu's heart like ashes.

Originally, Sun Xiu's status in Wu was already in danger, if he was defeated this time, he could just give Sun Hao a truth, even if Sun Xiu could escape back to Jiangdong by luck, he would definitely not be able to escape Sun Hao's punishment.

Looking at the Han army surrounded by him, Sun Xiu immediately gave up the idea of resisting and ordered his subordinates to put up a white flag and surrender to the Han army.

After Jiang Bin saw the white flag erected by the Wu army, he ordered the Han army to stop the attack and accept their surrender.

Sun Xiu ordered his subordinates to tie themselves up and came straight to Jiang Bin, Jiang Bin jumped off the horse and personally untied Sun Xiu. Jiang Bin and Sun Xiu have played each other, the two are chess opponents, comparable, Jiang Bin naturally admires Sun Xiu more, at this time Sun Xiu surrendered, Jiang Bin treated each other with courtesy, which made Sun Xiu very moved, but sincerely surrendered.

The men and horses brought by Sun Xiu were wiped out, and the news reached Luyang, Wu Yan immediately led his troops to turn around and flee south, he only had about 10,000 troops under his command, and he couldn't reach the Han army anyway, if he didn't seize the opportunity to escape, when the Han army came, it would probably be too late to leave.

Jiang Bin, who won a complete victory, was not very interested in this remnant of Wuyan's troops, and let him flee south, and did not chase after him, but sent someone to report to Liu Yin immediately.

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The battle of Luoyang has lasted for several days, the Wu army mobilized all the forces that can be mobilized, launched round after round of strong attacks on Luoyang City, the battle was carried out very fiercely, the city wall of Luoyang City was full of the corpses of the Wu army, in order to conquer Luoyang, the Wu army also paid a lot of price.

But such a majestic and strong Luoyang City, how can the Wu army be conquered in such a short period of time, the Han army stubbornly guarded each section of the city wall, let the Wu army's offensive like a storm, Luoyang City is still as solid as a rock, towering and unmoving.

Sun Xin served as the vanguard, responsible for commanding the siege operation, although he tried his best, but he never even the head of Luoyang could not climb, can not help but make Sun Xin is very frustrated, seeing that the period of ten days is getting closer and closer, Sun Xin ant attached to the siege of the city has not made any progress, and he has to pin all his hopes on Sun Kai's authentic way of attacking the city.

There are two ways to attack the city through tunnels, one is to dig the tunnel directly into the city, leave the exit in a secret place, and wait until the dead of night to send soldiers to sneak into the city from the tunnel, and then combine the inside and outside to take the city; The second is to dig the tunnel under the city wall, hollow out all the soil under the city wall, and then use wooden stakes to support it, after completion, when the sappers evacuate, light the wooden stakes, once these wooden stakes are burned into ashes, then the foundation supporting the city wall does not exist, and the city wall will sink and collapse.

These two methods have their own advantages and disadvantages, the first method requires a detailed map of the city, when the tunnel is excavated into the city, it must avoid the streets, military camps and other key areas, if the tunnel mouth is dug out, it will lead directly to the other party's military camp, it will become a big joke.

Only by setting up the tunnel entrance in a relatively private place, and going to the city to make careful measures, can the desired effect be achieved.

The advantage of the second method is that it can quickly destroy the opponent's wall, creating a gap that the besieging infantry can follow to enter the city. However, the disadvantage is that many large cities often have more than one wall, and when the outer wall is damaged, the inner wall can still serve to prevent the attack. Moreover, if the defenders were numerous, they might have repaired the broken walls by piling up sandbags, wood and stones.

And Luoyang City has such a defensive structure, which also makes Sun Kai from the beginning, he did not dare to destroy the city wall for the purpose, he must dig tunnels into Luoyang City, surprise the army to win.

In this way, the manpower and time required to dig the tunnel will increase, but fortunately, the Wu army has enough soldiers, so there is no need to worry about the shortage of manpower, but the time of ten days is very tight, if you can't dig the city on time, it is likely that the previous efforts will be wasted.

To this end, Sun Kai personally supervised, sent additional manpower, and implemented several groups of people to dig in turns, day and night, to speed up the progress. Since the excavation site chosen by Sun Kai was located in the camp and was covered by tents, it was almost impossible to see anything from the city.

What's more, Sun Kai has always been cautious, and he didn't dare to be careless, and even the new soil excavated every day was piled up in the tent, and then secretly transferred out at night.

Sun Kai had to be careful, after all, the tunnel siege was time-consuming and laborious, and it was a surprise victory, if the siege action was mastered by the army defending the city in advance, then what was waiting for them was almost a catastrophe.

Now that time is pressing, Sun Kai can only dig out a tunnel that leads directly to Luoyang City. Fortunately, Wu Guo, who had been lurking in Luoyang City for many years, provided them with a detailed map of Luoyang City, so that Sun Kai could easily understand the situation in the city and choose a good exit for the tunnel.

Digging tunnels is a systematic project, even if there is a map in hand, it is not completely guaranteed that the tunnel mouth can be dug to the designated place, after all, it is impossible not to have some deviations in the tunnel, sometimes the difference is a millimeter, a thousand miles of error.

But Sun Kai has no choice now, he can only do it hard, and his biggest hope now is that he can reserve the tunnel entrance in a suitable position, so that it is convenient for the Wu army to launch a sneak attack.

In order to increase the concealment of the sneak attack, Sun Kai decided to change the plan, the original plan was to dig an exit in the city, but now it seems that only one exit is far from meeting the requirements, so in Sun Kai's drawings, two more exits were added, both of which were selected in a relatively remote place in Luoyang City.

With the passage of time, the tunnel is extending day after day, because Sun Kai selected some strong soldiers, it is indeed more powerful to do the work, and now the tunnel has been dug under the city wall of Luoyang, and then dug in, it was dug into the city of Luoyang.