The first group of more than 700 troops went to Huizhong road. The troops were divided into two groups along the way. One group of more than 200 people was responsible for clearing the zombies along the way, and the other group of 500 people were in a straight line. They reached the tunnel as quickly as possible to build a fortification.

Like Songhu City, the Oriental Pearl TV Tower, the capital city of Yanjing, which has a population of more than 20 million, is the hardest hit area after the mutation. Most of the huge population has mutated into zombies. The dense population distribution has led to a very harsh living environment in these areas. In addition, China's strict management system for guns and other weapons has led to a small number of survivors in densely populated areas, making it more difficult to survive, and the difficulty of reorganizing and regrouping has increased dramatically.

The excessive concentration of zombies has also contributed to the formation of some medium and large zombie groups. These zombie groups are very destructive. There are not many rules to follow in their movement, and they constantly absorb scattered zombies on the route during the movement, which is similar to snowballing.

Where the zombies pass, basically no one can survive. At present, all countries have no good way to deal with these zombies unless they use nuclear bombs. However, which country is willing to use nuclear weapons on its own territory before the situation completely collapses.

This time, the zombie group that threatened the Tsinghua union department covered a very large area, including the north and south areas of the Chinese famous Ethnic Park and the entire national Olympic Sports Center. The area of the whole zombie group is ten times that of the Olympic village science park of the Chinese Academy of Sciences, where the Tsinghua union department is located. The number of zombies is expected to be more than 100000.

The deduction of the staff headquarters is correct. The 8.93% probability of successful holding is based on the parameters obtained by the zombie group changing its direction during the travel. However, even if the zombie group changes its direction, the tail front will sweep to the Tsinghua Union headquarters, destroying the construction of the 61889 troops stationed and losing their combat effectiveness. If the zombie group does not change its direction, the probability of successful adherence is zero.

After the dispatch of the first batch of troops, the second batch of troops also received the order to move. The combat units with a size of about 300 people set out towards the National Convention Center to build a second line of defense between the National Convention Center and the Olympic Park. The remaining 200 soldiers are on standby at the Yanjing Genomics Research Institute of the Chinese Academy of Sciences.

After more than half an hour, the leading troops arrived at the Huizhong road tunnel. The commander was Xu Yongping, who was born in the University of national defense science and technology. He was Shao Yifu's favorite student when he was president of the University of national defense science and technology.

When Xu Yongping arrived near the Huizhong road tunnel, he immediately sent an elite Reconnaissance Force to the front. Then, the engineering team was arranged to conduct multi-point blasting on the outside of the tunnel, and a gap was opened at a short distance.

Next, the engineering team placed high explosive Zha explosives in the tunnel. Xu Yongping's plan is to detonate these explosives to attack the zombie group and destroy the front line of the tunnel, so as to increase the difficulty of the movement of the zombie group. This can effectively delay the time and give the rear units more time to prepare.

At the top of the tunnel, the vanguard troops have quickly built simple fortifications. Xu Yongping stands on the top and looks at the water cube and the bird's nest in the distance, frowning.

This is a battle of great disparity in strength. After the day of mutation, Xu Yongping has personally participated in many actions, including the rescue and transfer of Beijing Union Medical College Hospital and Tsinghua University Park, and many small-scale defense battles of the Olympic village science park of the Chinese Academy of Sciences. Not only that, the 61889 troops were reduced by more than 80% on the day of mutation without collapse. Xu Yongping's contribution can not be ignored. The remaining 1200 soldiers are the hope of the Tsinghua Union.

The front reconnaissance unit reported that the zombie group was approaching here, and the front line had crossed the line of the Beiding Niangniang Temple and the Olympic Museum.

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"It's near", murmured Xu Yongping, holding up his high-power telescope and looking along the north central axis landscape Avenue.

In the field of view of the camera, there are many zombies.

"The explosives have been placed," a soldier came to report.

Xu Yongping nodded. His courage and confidence came from this army and the motherland behind him.

"The situation of the second army?"

"We are still cleaning up along the way," the correspondent replied.

"Inform them to speed up the cleanup work and come here as soon as possible to reinforce." Xu Yongping gave the order.

Five hundred to one hundred thousand, even if you kill a pig, it will take several days. Xu Yongping laughs at himself.

When the zombies appeared in the sight of the soldiers of the first line of defense, almost all of them took a breath. The dense zombies squirmed this way among the corpses, like locusts passing through the border, blocking all the roads in the sight. The reconnaissance troops have all withdrawn. During the withdrawal, the reconnaissance troops also carried out small-scale blasting on some buildings along the route. These buildings formed new obstacles after blasting, effectively delaying the moving speed of the zombie group.

When the zombie group moved to a distance of about 300 meters from the Huizhong road defense line, Xu Yongping issued an order to fire to the first army.

The purpose of the continuous fire automatic weapons carried by the first force is to block the front of this line of defense with firepower.

The zombie group soon received the baptism of the first batch of bullets. A large number of zombies in the front row were knocked down by the bullets, and the front of the whole zombie group was covered with blood and flesh. The bullet only brought fatal damage to a small number of zombies. Most of the zombies were still alive because the hit part was not the head. The zombies who lost their limbs struggled and crawled on the ground. The zombies behind them crossed their heads and were gradually trampled into meat mud.

The movement of zombies brings more damage to the injured zombies in the front than the fire attack of Xu Yongping's department.

The movement speed of the zombie group began to be hindered by the fire. However, the terrible thing about this group of monsters is that they can not feel pain and fear. In their minds, they only have a desire for the flesh and blood of living people. Some zombies in front of them began to run.

"Order everyone to raise the shooting point to the upper body and try to center on the head." Xu Yongping decisively began to issue a new round of orders.

The sound of explosion from the water cube and the bird's nest attracted many zombies to move there, and the pressure on the front was shared. This is the contribution of the investigation force in the blasting action.

The width of the line of defense close to 2000 meters has brought great pressure to the first army. This army has only 500 people, and the per capita firepower has to block the width of 4 meters. The bullets are pouring forward like a tide, and more and more zombies are falling. However, these zombies are like the end of the killing. One fell down, and ten more came up behind.

The dense buildings in the battle area have become the reliance of the defense forces. If it is a plain area, the impact strength of the zombie group will be increased several times. There is no means to prevent them from advancing except artillery washing.

However, the nearest artillery unit is the artillery division of the 30th 8th Army, which is several hundred kilometers away.

Artillery washing has become an extravagant hope.

In the National Central refuge under the Qinhuangdao National Geopark, the hearts of all who know the situation of the Tsinghua Union are hanging.

Rong Yun is the same. The satellite monitoring department sends a real-time satellite photo every few minutes. The marching route of the troops of the Tsinghua Union and the movement track of the zombies are clearly shown in the photo.

"It seems that Comrade Shao Yifu has made arrangements," Rong Yun said.

"However, time is not on the side of Yifu," Ding Yiqiu said. "According to the latest deduction of the staff headquarters, the defense limit of the first line of defense is 15 minutes, and the zombie group will soon break through this line of defense. However, the helicopter brigade of Ge Congxian needs about one hour to arrive at the Tsinghua Union headquarters, and it will take at least four hours to transfer personnel and equipment after arrival. This is still an ideal state, so Yifu is now racing against time."

"It now depends on the organizational ability of Comrade Yifu and the determination of Chinese soldiers to fight to the death."

"Comrade Shao Yifu's plan has been sent to us. We have all seen it. If the transfer is successful this time, the research progress of Tsinghua University's coordination department will also be greatly affected. We can increase our defense forces at the new base, but we can't transfer too many troops from the surrounding areas, because there are several large-scale shelters in Hebei Province, and the people of the country also need military protection."

"The Li family in Funan asked us for help. According to the data reported by Funan, their surviving population was about 50000. Marshal Li Xianyuan hoped that we would send troops to help them guard Xingzhou." A senior official of the National Center said.

"Our troops in the whole northeast are only the 16th army in Liaoning and the 39th army in Jilin. Both of them are responsible for protecting the people, and no effective force has been transferred to support them. Tell Funan that it is suggested to give up Xingzhou, which is not conducive to defense, and move to Dandong city. Dandong will organize ships to transfer some important personnel in the south to safe shelters." Military personnel spoke.

Rong Yun admonished: "the affairs of supporting the south are arranged last."