On September 1, 1939, the Führer of Nazi Germany implemented the "White Plan" in order to unify Europe, and launched a large-scale attack on Poland in four directions, in which Germany used 90% of its troops at that time. We say that Poland is a small country in Europe, but in fact it is not small at all, compared to France, Germany, the Soviet Union, Britain and other European superpowers, Poland is indeed small, but compared to the fragmented small countries in Europe, Poland is really a big wave, and people are also very hard-tempered.

Throughout the course of Poland's history, there has been a constant ...... of destruction, restoration, and restoration.

At 4:40 a.m. on September 1, 939, the German army, with its 6 armored divisions, 4 light armored divisions and 4 motorized divisions as the main assault force, broke through the defense line of about 800,000 people in the 6 armies of the Polish army in western Poland. The rapid and in-depth advance of the German armored forces and the air force quickly tore apart and encircled the large but outdated Polish army, and the Polish campaign ended on October 5, 1939. The Polish army suffered 66,300 killed, 133,700 wounded, 911,000 captured (of which, 694,000 were captured by the Germans and 217,000 by the Soviets), 100,000 fled to neighboring countries, while the Germans lost only 10,600 killed.

The Northeast Revolutionary Army also intends to follow the European blitzkrieg model, the current Northeast Revolutionary Army has more than 50 divisions, in October of the same year, it launched a fatal blow against the Japanese puppet army in Xinjiang, Tibet, Mobei, Kulun, and the Manchurian rebels, Commander Zhou Baozhong of the First Army of the Revolutionary Army, Ma Zhansan of the Second Army of the Revolutionary Army, Zhao Sanduo of the Third Army of the Revolutionary Army, Yao Luoqi of the Fourth Army of the Revolutionary Army, and Zhao Shangzhi of the Fifth Army adapted from the Anti-Japanese Federation, led, ghost special forces, wolf tooth special forces, The Siberian Tiger Special Forces assisted Gao Zhihang to recruit Li Ming as the commander of the aviation of the Revolutionary Army and the commander-in-chief of the Air Force, and the 40 brigades of the Air Force bombed 17 fortresses of the Japanese army in Northeast China.

From 1934 to 1939, the Japanese Kwantung Army requisitioned millions of Chinese laborers, and built 17 military fortresses with a total of about 80,000 permanent fortifications in the border area of more than 4,700 kilometers [Manchuria, Mongolia and the Soviet Union] from Hunchun in Jilin in the east to Hailar in Inner Mongolia and Arshan in the west. The fortified group is about 1,700 kilometers long. These include thousands of permanent underground warehouses, power stations, communication hubs, water supply stations, and more. Ancillary military facilities, as well as a large number of second- and third-line positions, field positions, military airports, military railways and highways, etc., are extremely large, and the Japanese army invading China frantically called this huge military engineering system the "Oriental Maginot Line."

The 17 fortresses are: Hunchun Fortress, Dongning Fortress, Lumingtai Fortress, Suifenhe Fortress, Guanyuetai Fortress, Banjuhe Fortress, Miaoling Fortress, Fengxiang Fortress (Xingshan), Fujin Fortress, Hutou Fortress, Holmozin Fortress (Shengshan), Yihui Fortress, Heihe Fortress, Fabela Fortress, Hailar Fortress, Unur Fortress, Arshan Fortress.

(1) Hailar Fortress

Construction began in June 1934 and was completed at the end of 1937, and the entire construction of the fortress took about four years. The total area of various fortifications is 10,000 square meters, the total length of the passage is about 4,000 meters, and the total area is 5,000 square meters. 130,000 Chinese laborers were mobilized, all of whom were killed by Japan after the completion of the project, and only one survivor was found after the liberation, and even the Japanese non-military personnel involved in the project were all repatriated to China and closely monitored.

(2) Unur Fortress

It is located in the middle section of the Great Khing'an Mountains, Wunuer Town, Yakeshi City, Inner Mongolia, which is surrounded by mountains on all sides, the Binzhou Railway passes through here, and the Wunuer Fortress began to be built in 1944, which is divided into the Wunuer position, the Boketu position, the Wudu River position, and the Yakeshi position. Except for a small number of prisoners of war, who were called special laborers, most of the laborers who built the fortresses were obtained in the form of fraud, forcible arrest, entrapment, and secret transportation in the puppet Manchukuo or the areas ruled by the interior. There were more than 100,000 laborers at the Unur Fortress, and by the time Japan surrendered in 1945, some of them were unfinished, and the laborers were almost wiped out, and there were very few survivors. The Wunuer Fortress was the only inland fortress of the Kwantung Army with a deep defense, forming a western frontal triangular configuration with the Hailar and Arshan fortresses, with the purpose of serving as a second line of defense and becoming an important defense line to protect Qiqihar and Harbin from the west.

3) Arshan Fortress

It was built in 1935~1945 and is located in Arshan City, Xing'an League, Inner Mongolia Autonomous Region. It is composed of the Flower Fort Position, Wuchagou Airport, Nanxing'an Suidao, Pillbox, Arshan Station, etc., and was built by more than 50,000 people of the 107th Division of the Third Front Army of the Japanese Kwantung Army.

(4~7), Fabela Fortress, Aihui Fortress, Heihe Fortress, Holmozin Fortress (Katsuyama)

When the Japanese Kwantung Army built its fortress positions, it divided the Sino-Soviet (Mongolian) border into four theaters, namely the eastern front, the northeastern front, the northern front, and the western front. The "northern front" theater mainly refers to the four military installation clusters in Aihui (Xigangzi), Hormojin (in Sunwu County), Heihe, and Fabela in Heihe Province of the puppet Manchurian people. These four "border positions" are collectively known as the fifth, sixth, seventh, and thirteenth border positions, and were built successively from 1934 to 1942.

Fabera Fortress

The "13th Frontier Chendi", also known as the Fabela Fortress, is the northernmost flank of the frontal border position in the north, and is a permanent firepower point and field position built on and near the high ground on the west side of Dayin Mountain in its north.

Black River Fortress

The "Seventh National Frontier Position" is the Heihe Fortress, which is located in the city of Heihe and is only 2~3 kilometers away in a straight line, where Japan secretly set up large-caliber artillery to prepare for the war against the Soviet Union, and directly hit the artillery fire on Blagoveshchensk, the capital of the Amur Region, on the opposite bank and blockade the Jieya River.

Aihui Fortress

The "Sixth National Frontier Position" is the Aihui Fortress, which is the core position of the northern front, relying on the Xigangzi fortifications, with the tide, the second station and other positions, forming a triangular defense system. Among them, the tide is 10 kilometers away from Xigangzi, and the second station is 15 kilometers away from Xigangzi in a straight line.

Holmogen Fortress (Katsuyama)

The "Fifth National Frontier Position" is a group of right-wing positions in the northern frontal theater and is a military project built in Yanjiang Township, Sunwu County. The post-war memoirs of the survivors of the Japanese soldiers in the fortress here record that in order to keep the project secret, after the completion of the project, more than 3,000 Chinese laborers were slaughtered at one time.

The number of Chinese laborers in the four fortresses is unknown, but the "monument" to commemorate the Chinese laborers who were brutalized to death by the Japanese in Fabera still exists and is the only one. The so-called northern frontal position built by the Japanese Kwantung Army in Heihe is 50 kilometers longitudinal and more than 100 kilometers horizontal, forming a complete defense system as a whole. Each position can complement each other's defense, whether it is firepower or soldiers, and each fortress has better communication equipment and power support; through such a configuration, it can not only greatly improve the defense and combat capability of each position, but also enhance its own protection and survivability.

(8), Tiger Head Fortress,

It starts from the Flint Mountain in the west, reaches the Ussuri River in the east, faces the Iman River in Russia across the bank, starts from the Bianlianzi Mountain in the south, and reaches the Hubei Mountain in the north. The central area is 12 kilometers wide on the front and 6 kilometers deep in depth. Within a radius of tens of kilometers, there are more than 10 fortresses of all sizes, which are composed of five positions: Tiger Mountain, Hudong Mountain, Huxi Mountain, and Tiger Roaring Mountain. Among them, Tiger Mountain is the main position, Hudong Mountain, Hubei Mountain is its two flank forward positions, into a pincer shape to the north and south line of the guard formation, Huxi Mountain, Tiger Roaring Mountain two positions are located in the west of the main position of Tiger Mountain, for the second line of the rear of Tiger Mountain.

Tiger Head Fortress was completed in 1934~1939. The huge military project required more than 100,000 laborers and took six years. According to the 53 surviving Japanese soldiers of the Tiger Head Fortress, Tetsuo Okazaki's "Secret Record of the Battle of the Tiger Head in Japan and the Soviet Union" written after the war, because the fort facilities were largely completed, they lied about holding a banquet to complete the battle, and they were rewarded with wine and food, and all the laborers were concentrated in the depression at the western foot of the Tiger Mountain, and were strafed by heavy machines, and the corpses were piled up, and only a few escaped by chance.

(9), Fujin Fortress

The fortress of Fujin was located under the jurisdiction of Fujin City in the northeastern part of present-day Heilongjiang Province. Fujin is located in the south bank of the lower reaches of the Songhua River, in the hinterland of the Sanjiang Plain, far away from the Sino-Russian border, but because Fujin City is close to the Songhua River, before the railway was opened, the Songhua River was the fastest way for the Soviet Union to attack Jiamusi and Harbin, and Fujin City is the only way to pass, so it has extremely important strategic significance. The construction of Fujin Fortress began in 1938, and the construction of ancillary works was still not completed until the defeat of Japan in 1945. According to Japanese records, most of the laborers who built the fortress were prisoners of war from the southern battlefield, and a small number of citizens and villagers were lured or captured from various places outside the Guan. After the completion of the main project, more than 20,000 laborers were all wiped out in order to keep secrets, and none of them survived. After the liberation, 22 survivors of the runway repair of the airport outside Fujin were found.

(10), Fengxiang Fortress (Xingshan)

Xingshan Fortress is located in the Qingshan Forest Farm of Hegang Mining Group and the Position Mountain of Hegang Forestry Bureau in Hegang City, Heilongjiang Province. Construction began in 1932 ~ completed in 1939. The number of laborers who built the fortress is unknown, but only one survivor and the rest are wiped out.

(11~12), Miaoling Fortress, Banjie River Fortress

Half-cut river, Miaoling fortress as one of each other, was built in February 1934 ~ 1937, is located in Jidong County, Heilongjiang Province, 5 kilometers south of Xiangyang Town, in the middle of Wenyang South Mountain, south from the Qinghuling Temple in Jidong County, north to the honey mountain of the southern part of Mi, the front is 120 kilometers wide, 11 kilometers deep, distributed in the hilly area of the Wanda Mountains. The construction laborers and the death are unknown.

(13~15), Suifenhe Fortress, Lumingtai Fortress, Moon Viewing Platform Fortress

Located in the eastern part of Suifenhe City, Heilongjiang Province and the northern part of Dongning County, the Sino-Russian border area, with a border line of 26.4 kilometers, Suifenhe, Lumingtai and Guanyuetai fortresses are three mutual fortresses.

Suifenhe Fortress is located in the current Suifenhe City, built from 1934 to 1937, with a frontal width of about 12 kilometers, a depth of 8 to 15 kilometers, and a position area of 180 square kilometers.

Lumingtai Fortress is located in the north of Dongning and the south of Suifenhe Fortress, built from 1938 to 1939, with a position area of 84 square kilometers.

The Moon Viewing Platform Fortress is located in the north of Suifenhe Fortress and the south of Banjiehe Fortress, built in 1938-1939, with a frontal width of about 19 kilometers, a depth of about 20 kilometers, and a position area of 380 square kilometers.

(16), Dongning Fortress

Dongning Fortress is located in Dongning Town, Heilongjiang Province. It was built from the spring of 1935 to 1939, and the construction of the fortress was carried out by deception by laborers from Northeast China, Hebei, Jilin Yushu and other places, and some were Chinese prisoners of war, and a total of 170,000 laborers participated in the construction of the Dongning Fortress. It starts from the North Yama Palace of Suiyang Town in the north, and reaches Ganhezi in the south, and the front is more than 110 kilometers wide.

The project is called "special workers" with strong secrecy, and they are mainly used for heavy physical labor in border military projects or major factories and mining enterprises, and special workers are mortal workers, and more than 51,000 people have been mutilated to death. In August 1945, before the surrender of the Japanese Kwantung Army, thousands of laborers were tricked into the cave, and then a section of the hole was blocked with sand and gravel. The laborers were buried in it forever. On September 11, 1943, Zhang Siwen and 42 other prisoners of war laborers launched a riot, killing Japanese guards and fleeing, a total of 31 people fled to the Soviet Union, of which 2 were missing, the other 2 were killed, and 10 were captured and killed by the Japanese army. It was the only laborer who managed to escape. The Japanese army's methods of massacring laborers were extremely despicable, such as injecting poison, secretly shooting, luring them into burying them alive, and even killing them by bacteriological experiments.

(17), Hunchun Fortress

Located in Hunchun City, Jilin Province, at the junction of China, Russia and North Korea, Wujiashan Fortress was built in 1934 ~ 1945, is the eastern starting point of the Northeast Fortress, commonly known as the "Demon Fortress", according to local residents, in order to prevent the leakage of military secrets, the Japanese army never requisitioned locals, but requisitioned young and strong laborers in the pass, mainly from Shandong Province. According to villagers, after the completion of the project, it is very likely that they were brutally suffocated to death in a cave, with an unknown number of dead and no survivors. In recent years, several villagers have found a mountain suspected to be a fortress in the "Erdaoguan" of Caoping Dongshan in Chunhua Town, and they couldn't find the entrance and exit.

Friends who are interested can take a look at the history of these fortresses, here is just as the number of fortresses, introduction, I hope that friends can remember this humiliating history.