In the evening, Xiaolu received good news that Zhu Chi's troops had dug through the tunnels to enter several fortresses such as Shengshan, Aihui, and Heihe, and had the conditions to attack Sunwu Heihe. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 At present, there are less than 4,000 Japanese troops stationed in Sunwu, Heihe and other places, and there are 3,000 puppet army troops stationed on the ground, while our army has more than 40,000 people, well-equipped, please give instructions to attack.

In addition, one of the enemy's officers discovered our operation, which had already been killed, and he was afraid of a long night and many dreams, hoping to attack as soon as possible.

The command held a meeting overnight, and felt that defeating Sunwu Heihe could further shake the determination and will of the Japanese army to resist, and it could be fought. As long as the technicians are fully equipped, they can attack the Sun-Wuhei River, the technicians can receive the equipment, and the air force and artillery can receive its artillery and airfields.

Attacking Sun Wu must be sudden, as long as the tunnel is dug through, it must be attacked, otherwise it will not be good if the tunnel is discovered after a long time.

The command drew up a detailed battle plan, including Sun Wu, including a certain Shenyang and Dalian in Changchun, and reported it to Yan'an.

Yan'an quickly called back: agreed to fight Sun Wu first, and the opportunity must not be lost. Several other cities can be postponed until the supplies are ready. Agree to the practice of encircling Changchun and Shenyang, and if the Japanese retreat, they can be pursued on a long road.

Zhu Chixia, Kuiwu, Zhu Yuting, and Wei Xilin's Xing'an Column have been holding out here for several years. Their previous mission was to fight Sun Wu. Now, most of Sun Wu's Japanese troops have gone to attack the Soviet troops in Siberia, and their task has become that of Sun Wu, harassing and attacking the Japanese troops on the other side of the Heilongjiang River. The ultimate task is to liberate the other side from Japan.

Zhu Chi was the commander of this column, Xia Kuiwu was the deputy commander, Zhu Yuting was the political commissar, and Wei Xilin was the chief of staff.

In the past few years, except for Bei'an Town, Longzhen, and Sunwu Towns along the railway, all other areas have recovered.

In the past few years, they have cultivated a large amount of fertile land and taken in a large number of refugees, including North Korean refugees, landless farmers in Northeast China, and victims of disasters in the Yellow Flood Area.

Today, they have taken in another 800,000 Henan victims, and 400,000 have already begun to reclaim the famine, and half of them are still on the way.

After the Japanese army attacked the Soviet Union, the troops occupied all the towns outside the railway line, and during the period of Qiqihar Guangfu Road Harbin Guangfu, along the railway line, except for Bei'an, Sun Wu, all recovered, forming a situation in which the three towns of Bei'an, Sun Wu and Heihe have not yet been recovered.

With sufficient manpower in hand, the attack on Sun Wu was put on the table.

After the victory in Hailar, various units popularized the tactics of using tunnels to break fortresses. Hutou, Dongning, Suifenhe, as well as Sun Wu and Heihe, all adopted this method. In order to excavate the tunnel smoothly, Xiaolu asked Lu Zhengcao to send several teams as experts to guide the excavation work of various troops.

From Sun Wu to Heihe, Aihui, Fabela, there are a series of positions and fortresses distributed along the river. As long as it is Sun Wu's Shengshan Fortress.

According to the Manchu language, the Japanese army called the Shengshan Fortress as the Khormojin Fortress, which was the fifth national border position of the puppet Manchurians.

Shengshan Fortress is 40 kilometers away from the county seat of Sunwu, on the mountain by the Heilongjiang River. The total area of the fortress is more than 100 square kilometers. The vast majority of the positions of the fortress were ground, and a small part were underground.

The fortress has two wings, the left and the left side of the Shengwutun Murakami Brigade Headquarters, with spare ammunition depots, military quartermasters, two officers' dormitories in the east and west offices, and also water supply towers, clubs and other facilities, and military material reserves can be stationed for more than 2,000 soldiers for more than a year.

On the right side of the fortress there is a field position of Maolantun, with nearly 100 military fortifications of different scales. The main position of the fortress is equipped with four infantry squadrons, two artillery squadrons, and an engineer corps, equipped with howitzers, cannons, anti-aircraft guns, large fortress guns and anti-tank rapid-fire guns; Infantry with light and heavy machine guns, infantry guns, field mountain artillery.

The Shengshan position is equipped with barracks, hospitals, pillboxes, shelters, command posts, warehouses, observation posts, artillery positions, machine gun positions, field bunkers, trenches, communication trenches, anti-tank trenches and a large number of underground and aboveground permanent fortifications, most of which have been completed.

According to the reconnaissance, there are now 3,000 Chinese coolies left, and roads are being built. According to the news from Xinjing, the Japanese army was about to end all fortress works. This means that these thousands of people are about to die.

Underground fortifications are excavated and then concrete is poured, and finally, a one-meter-thick layer of soil is covered on top of the cement fortifications.

In addition, Sun Wu had several other Japanese troops and logistics organs: the 731 Detachment of the Sun Wu Detachment of the 673 Bacteriological Unit, the Military Hall, the Thermal Power Plant, the Sun Wu Shrine, and the Zengjiabao Airport.

Before the attack on the Soviet Union, the Japanese army stationed nearly 100,000 people in Sun Wu, and later, when attacking the Soviet Union, the main forces were all pressed to the Heihe battlefield, and the Shengshan fortress lost its strategic significance, and only the almost completed fortress remained, only the surface fortifications and a small number of underground fortifications of Fabela had been abandoned, and Aihui had also given up, and only the two fortresses of Heihe and Shengshan were still garrisoned.

In the spring, the troops began to dig tunnels, approaching this series of fortifications, with the focus on Heihe and Katsuyama, with Fabela and Aihui as secondary targets.

There was great difficulty in digging tunnels.

In spring, the ground here is full of frozen ground. I had no choice but to stop work. In the spring, the permafrost melts. Is it ready to start? No, no.

In the Heihe area, there is a kind of permafrost, called permafrost, in the ground of two or three meters underground, the soil will never melt.

The troops excavated in the permafrost. In order not to alarm the Japanese army, they excavated from a distant col on the south side, and the excavated soil had to be dumped in a ditch far away. The workload was enormous, and the troops dispatched several thousand men to dig more than a dozen tunnels.

In addition, the troops also dug tunnels in Sun Wu and dug tunnels into the Japanese military barracks, hospitals, and office buildings. The excavation here is very smooth.

By mid-June, the tunnels were dug under the underground positions, under the buildings, and under the warehouses.

The excavation began lightly, only during the day, to avoid the sound of excavation alarming the Japanese army.

When looking for access to the building and underground fortifications, there was joy and sorrow. Happily, several passages into the building were dug through. The worry is that access to the underground fortifications is difficult to find.

It was not until the beginning of July that it was discovered that the well of the underground fortifications was the only way to enter the underground fortifications, and by opening the walls of the well, it was possible to climb up to the hall near the kitchen, from which it was possible to reach all the important strongholds of the underground fortifications.

On July 3, just after completing the search for the entrance, an accident occurred, and a Japanese officer who was hunting in the mountains discovered the hole and was killed by the soldiers who dug the hole.

The Anshan Command immediately ordered the Xing'anling Column to prepare overnight and attack in the early morning of tomorrow, making sure to attack the enemy's underground fortifications before the enemy took precautions.

It was a bit hasty for the command to give this order, but if it was not to attack now, it would have been impossible to attack once the enemy had been prepared.