After hearing Sima Yi's question, Cao Cao shook his head: "at present, there is no news coming back, but according to the news from Ziyang two days ago, it should be these days."

The slow transmission of information worried all Cao Cao. Now Cao Cao's spies have found out that there are flying slaves in the eastern expedition to deliver intelligence. However, this flying slave is too rare. Cao Cao has made people look for talents in this field, but after a few months, there are still no results.

In fact, Cao Cao is not the only one who knows about it. Many of the princes in the world have already known about it. Yuan Shao has also found craftsmen who can be trained and cultivated. But at present, the scale is not large enough. It is only limited to several important counties and cities under his rule. There is no time to decorate other places. However, Yuan Shao has seen this benefit, but he also hides it to death Dead, no one else knows.

After a moment's silence, Cao Cao said to Sima Yi, "let's start the army tomorrow. Now that the East army has begun to attack Dingtao, let's put a little more pressure on them."

Sima Yi didn't object this time. After all, it took a day or two from Changyi to Dingtao, so it's OK to start sending troops tomorrow.

At this time, Changyi recruited nearly 20000 soldiers, so Cao Cao prepared to leave 10000 Qingzhou soldiers and 20% of them to Xun Yu to defend Changyi. He and Sima Yi led 20000 Qingzhou soldiers, 10000 hubaoqi and 20000 soldiers to Dingtao for support. In a few days, XiahouDun also led ten thousand soldiers of guerrilla camp and ten thousand soldiers of prefectures and states to join him. At that time, Cao Cao will have 70000 reinforcements, and the 30000 troops in Dingtao city will be 100000.

According to the intelligence analysis of Ding Tao in recent days, the total strength of the two main armies of the eastern expedition army should be between 130000 and 150000. In this way, after a few days of siege, Cao Cao's strength will definitely lose 350000. In this way, Cao Cao has a great chance of winning.

Cao Cao's guess is not wrong. After a few days of fighting, the eastern expeditionary army has lost nearly ten thousand. If there are three or five days of full-scale siege, it is very normal for the army to lose twenty or thirty thousand.

The next day's attack was really as Ren Jun had expected. It was more fierce than the day before. In the morning alone, the eastern army launched two rounds of attacks on Chengtou, forcing Ren Jun to transfer the core camp to Chengtou to take part in the defense at the beginning of the afternoon's war. The participation of the core camp made the battle more fierce. In the last round of attack in the afternoon, Huangfu Chaobo took part The Tiebi camp and the halberd of Zhang Ying also took part in the attack, but they were still driven down by Cao Cao Jun.

By the end of the day, Huangfu Chaobo could basically confirm that there were only about 30000 soldiers in the city, and even the backbone camp around Cao Cao had taken part in the battle. It can be seen that even if there were soldiers in the city that had not been sent out, there should be only a few thousand.

At this time, the Dugu brothers also rushed to the Chinese army to report to Huangfu Chaobo that the tunnel had finally been dug into the city, and the exit was about ten steps away from the northwest corner of the city wall, but now the tunnel has not been fully opened. However, they are already arranging for the final reinforcement and exploration of the situation around the exit.

Tunnel siege is like this. Although it's a professional, the location of the exit still depends on Mongolia. So why tunnel siege needs to fight several or even more than a dozen? That's the reason. If you're not lucky, the tunnel exit may be on the main road, or even in the barracks next to the city wall.

Fortunately, two of the three tunnels can be used. The westernmost one is just at the northwest corner of the city wall, in a small yard less than 50 steps away from the city wall. Just for the sake of the war, the people around the city wall have been evacuated, and in a few days of war, a few throwing stones just hit the courtyard and collapsed a room inside. The exit is in the collapsed house.

From this courtyard, just opposite the turret in the northwest corner, there is a passage leading directly to the city.

Another exit is about 500 steps to the east of this exit. It's only seven or eight steps away from the north gate. It's a market near the north gate. Now it's empty.

The tunnel in the middle is just at the foot of the wall beside a road. If it is excavated directly from here, the whole bluestone wall will collapse and the tunnel will be sealed.

Although they are unwilling, they are also secretly glad that two of the three tunnels can be used, which is already very good. Huangfu Chaobo called in the generals to discuss the time of attack. After finishing the final arrangement, he let them disperse.

Disturbing the enemy in the evening was still going on as usual. However, all these things were left to the guards and civil servants. The battalions and the guards entered their tents early to have a rest. The siege time was set at the beginning of May, which was the most difficult time for the people.

Two moments later, the battle camp and the guards in the North Camp had quietly got up. The cooks had started to make preparations at the beginning of the third shift. They had prepared breakfast for tens of thousands of people. After breakfast, the soldiers entered the tunnel under the command of the general.

This attack is the Tiebi camp and gaoshun camp under the command of Dianwei. They will each enter the city through a tunnel. Behind them, there are 1000 yuan crossbow soldiers to provide them with follow-up support. And five thousand iron eagles and ten thousand soldiers in the barracks. These ten thousand soldiers are composed of some soldiers drawn from the East and the West. They will attack the city from the city gate after the city gate is opened.Of course, after the war started in the north gate, the East and the West would also attack the city to contain the Cao army on the two walls.

As time goes by, it has been almost half an hour since the two soldiers and horses entered the tunnel, but the city is still quiet. Huangfu Chaobo stood two miles outside the north gate. Behind him were the elite soldiers of the 15000 East army. It was the darkest hour before dawn, and the army approached quietly by the light of the torch at the end of the city.

Huangfu Chaobo turned to look at Pang Tong and said, "Shiyuan, why haven't you started yet? Have you been found by the guards in the city?"

"Don't worry, Lord. It should be soon. The generals of the two associations should be gathering troops. If they are found by the garrison, it will be so quiet." Guo Jia said with a smile;

all of a sudden, a rocket soared into the sky, and then another rocket soared hundreds of paces away from the rocket, and then the shouts of killing and the sound of blade impact were heard at the head of the city.