Shangjing, like Beijing in the previous life, is in the 'land of four stops', and is a treasure land of 'mountains and rivers in the north' - Taihang in the west, sea in the east, Yanshan in the north, and Zhuanjiang in the south.

The Taihang Mountain in the west also has a string of small basins and the Taihang Eight Paths leading to the hinterland of the Central Plains, and there is a Zhuanjiang River parallel to the Taihang Mountain, the west of the Zhuanjiang River belongs to Yuye City, and the east belongs to Dingwu City. The north side is still the Yanshan Mountain Range, which has the 'five counties of Saishang', which is in the shape of an oblique '>', extending to the Yin Mountain in the west and the Daxianbei Mountain in the north, so these three mountains are arranged in the shape of an inverted 'product'. One end of the direction of Yinshan is Changchun City, the place where the south of the Qianyi invaded the Central Plains, the most fierce place for agriculture and animal husbandry in the past dynasties, and the other end is almost connected to the Great Xianbei Mountain, and there is only one Huangshui (Xilamulun River) estuary that allows the herdsmen of the desert plateau to enter the Northeast Plain and enjoy the philosophical wood prairie south of the estuary. However, for the herdsmen of Mobei, the many rivers of Dalai Lake further north can more easily pass through the Daxianbei Mountain.

Therefore, the direction of Shangjing's defense in the north is roughly divided into northwest and northeast. The former is the famous Warring States 'Zhao North Three Counties', where Changchun City is guarded, and there are several Yanshan trails behind it that connect several small basins, leading to Shangjing. One of the passes is backed by a small basin surrounded by the whole area, and has enough self-sufficiency to 'dig deep into the soil and accumulate grain'. The other northeast direction can go north out of the Central Plains through the 'Liaoxi Ancient Road' in Yanshan - Pinggang Road, Lulong Road, and Wuzhi Road. In addition, the eastern foot of Yanshan by the sea is constantly alluvial by the East China Sea, and after thousands of years, it has formed a long and narrow tidal flat to the southernmost tip of the Northeast Plain - the West Liaoning Corridor, perhaps Gu Ci is more familiar with the two place names of 'Shanhaiguan' and 'Qinhuangdao'. The North Pass that controls the West Liaoning Corridor is Qi'an City, backed by mountains and facing the sea, and has always been a battleground for soldiers.

The southernmost part of the Northeast Plain is a circle of alluvial plains where the Lihe River flows into the sea, called the Lihe Plain, and the western part is the Liaoxi Plain, which is out of the Liaoxi Corridor. There is 'Liaoxi', there must be 'Liaodong', these two names come from the Warring States, Qin and Han dynasties' 'five counties', and are still used today. 'Liaodong County' originally referred to the Banla Plain in the east of the Lihe Plain, which was symmetrical with the Liaoxi Plain, but also included the small peninsula of Liaodong during the Ding Dynasty, as well as the north of the Han River on the Goryeo Peninsula, and even included the Tianchi of Changbai Mountain, which was wider than the scope of the Great Wall of Yanbei.

After the Tang Dynasty stepped on Goguryeo, there were no immigrants to the border, making enough space for the nomads and fishing and hunting peoples who came down from the northeast. Fortunately, the Ding Dynasty did not make this mistake, learned from the Tang Dynasty on land and sea, got Goryeo, and then advanced into the Northeast, overthrew the Bohai Kingdom, integrated the Great Northeast into Dandong Province, sealed the king and sent officials, and immigrated to reclaim the famine. The entire Lihe Plain has excellent land that is conducive to cultivation, and the Han people are the most, and the Goryeo people, who have always 'paid tribute when there is something to do and stand on their own feet when there is nothing to do', of course, also have a soft spot for this place. In order to make the Goryeo people honest, the Dingchao started to 'fight against the razor', driving out the Bohai people who originally occupied the Lihe Plain, and some of the mediocre nobles moved to Qi'an City, following the tradition of 'destroying the country without destroying the rituals' in the early days of the Spring and Autumn War, leaving them some incense, and most of the Bohai Navy people went to Liaodong County, looked at the Goryeo, and did not allow them to cross the Han River and penetrate the northeast. Of course, after so many years of integration, except for the different accents, there is no difference between the Han, Bohai and Goryeo people in Liaodong County. But there is also a disadvantage, the Goryeo people who feel that the land on the peninsula is not enough have either climbed over the mountains and mountains, all the way into the Changbai Mountain and the Sangang permafrost further north, and compete with the Heishui Tatar people for territory.

In fact, most of this part of Liaodong County is mountainous and hilly, the home of fishing and hunting peoples, and it is not suitable for Han people with agricultural talents. But there is no way, the old Dingchao is overbearing, overhauling the port and embankment, starting from the northeasternmost hills and ravines of the Yanshan Mountains to repair the Yanbei Great Wall, all the way to the Goryeo Datong River, the west starting point of this section of the Great Wall is Beiguan 2.0, facing Zhaowuda, and then north is the philosophical wood. It is a pity that the defense line of the Ji Dynasty shrank, abandoned this section of the Yanbei Great Wall, and built a canal between the two northern exits of Lulong Road and Wuzhong Road, and built the Great Wall of the River, and had the Zhenbei City that governed eastern and western Liaoning.

The Ding Dynasty was not the first dynasty to occupy territory on the Goryeo Peninsula, the remnants of merchants who were unwilling to submit to the Zhou people during the Shang and Zhou dynasties established the 'Jizi Joseon' here, and the Great Wall built by the Yan State in the Spring and Autumn Period and the Warring States Period was also a similar route, but it was old and not as famous as the Ding Dynasty. The Great Wall helped the Han immigrants to firmly hold the Liaoxi Plain, and the Liaodong across the river, although sometimes not necessarily in the Chinese territory, but the small part of the cultivated land to feed the population can still withstand the invasion of the fishing and hunting peoples outside the Great Wall. The Koreans once expressed their 'strong condemnation' of the Great Wall, but the residents who called themselves 'Kannai people' under the protection of the Great Wall did not want to be forcibly demolished, and after a few meaningless battles, they pinched their noses and confessed. The Goryeo Li family, who is currently in power, is a native of Guannai who made his career in Liaodong, so he has a very close relationship with Dayu and is like a family.

Leaving the Great Wall of Yanbei, it is considered to have officially entered the Northeast Plain, and the sight suddenly brightened. The Northeast Plain is a thousand-mile tundra with flat terrain and rivers that are not uncommon, with two main rivers, the Lihe River in the south and the Songhua River in two, which can be roughly divided into three parts according to the location of the rivers and hills. The bottom piece is, of course, the Lihe Plain, bounded by the Yanbei Great Wall. The middle plain is dominated by the Li River that runs eastward, and the largest tributary of it is Huangshui, so it is also called Huangheihara, which contains Zhelimu and Zhaowuda. To the north of the Huang Pingyuan is a series of low watersheds, the 'Buyeo Plateau', and further north of the plateau is the upper part of the Northeast Plain - the Nanhe Plain. One of the bifurcated Nanhe River goes south through the platform into the Changbai Mountains, and the other continues eastward, flowing out from the northern foot of the Changbai Mountains and the Xiaoxianbei Mountains, passing through the Yilan City (Jiamusi), which can be navigated by rivers and seas, and entering a large area of frozen and hard swamp and fertile soil, that is, the Sanjiang Plain.

There are several connected valleys in the south of Yilan into Changbai Mountain, one of which is 'Ningguta'. Ningguta is the name of the people of Hubei, it is said that this place was their birthplace, and now it is occupied as the capital by the new Bohai State, renamed 'Longquan Mansion', the Quhe River (Mudanjiang) passes through the city, the mountains are continuous and the rivers are vertical and horizontal, 'nine points of mountains and rivers and one point of fields', easy to defend and difficult to attack.

If the elevation of the Buyeo Plateau is higher and the terrain is more complex, the Nanhe Plain can be described as a rare triangular 'land of four stops' - there is the Buyeo Plateau in the south, the Daxianbei Mountain in the west, and the Changbai Mountain and the Xiaoxianbei Mountain in the east. It's a pity that the plateau is not strong, and the entire Northeast Plain must be occupied as a whole in order to be able to defend it.

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Combined with the brief geography of the Northeast region written by his daughter, Gu Ci recalled the key points of the exam that he memorized day and night back then—the history of humiliation brought to China by Dongying, who clamored for the 'Greater East Asia Co-Prosperity Circle'—maybe he could learn from Yuan Yi and the third brother. Fortunately, with her love for geography and history for more than ten years in her previous life, as well as the memory that was repeatedly strengthened during the college entrance examination, she can now contribute to her husband's hegemony with her children.

At that time, Dongying used the Goryeo Peninsula as a springboard, and the tactic of 'digging out the heart' went straight to Shenyang, directly controlling the Lihe Plain, and only then did he have the 'feat' of occupying Jinzhou in the south first, and then invading Harbin in the north, and fully dominating the Northeast Plain. Just as they had planned for Goryeo to become an 'empire', they also fostered a 'Manchukuo' in Changchun. Generally speaking, the teacher and the text will give a standard answer during this time period - 'the three northeastern provinces fell due to the September 18 Incident', but will not mention that the area of Manchukuo is actually the 'four northeastern provinces', including the disappeared 'Rehe province'. This was Dongying's second goal, so the anti-Japanese coalition broadsword team and the Japanese invaders fought a bloody 'Great Wall War of Resistance' on Yanshan. If Yanshan could not be controlled by the Central Plains regime, it would be a matter of time before the North China Plain broke through from the north, and so did the Manchu Qing Dynasty and Dongying, so there was the Lugou Bridge '77 Incident' a few years later. Next, the focus of the study turned to the history of the Chinese nation's all-out war of resistance, but few people noticed that later, in order to achieve the strategic position of Manchukuo's 'land of four stops', Dongying wanted to include the Daxing'an Mountains as a whole as the western defense line, infiltrated the Mongolian Plateau and the Far East, and fought a 'Nomenhan Campaign' with the Soviet Union in the northwest corner of the Daxing'an Mountains. Fortunately, the gentle and vast terrain here is not only suitable for horseback people to gallop, but also more suitable for the mechanized corps led by General Zhukov to fight.

I have the impression that the Central Plains regime is a compulsory course to guard against the southern invasion of the enemy in the northeast, but there are not many examples of attacking the northeast from the south to the north and winning.

After the Ming Dynasty repaired the Great Wall and occupied the western Liaoning corridor, it seems that the passes of the Yanshan Great Wall west of Shanhaiguan were relaxed, and it was in these places that the Qing army launched the 'Battle of Entrance', breaking through the defense line of Yanshan and the Great Wall several times and attacking Gyeonggi, and invading Shanxi and Shandong in the south. Just because Shanhaiguan was not lost, the Manchurians could not occupy the size of the land, let alone conquer the Jingshi. Later, he was able to enter the customs, because the king of Pingxi took the initiative to give a gift, and he could not be used as a reference.

And Dongying's entire Northeast strategy is so fast and efficient, relying on the convenience of the railway. Thirty years ago, in order to fight for control of East Asia, the right to build roads in the northeast and the right to land on the small peninsula in eastern Liaodong, Dongying and Maozi fought a lot of battles. As a result of the war, Mao Zi repaired the 'Eastern Railway' and Dongying repaired the Korean Railway. Shenyang, Changchun, and Harbin became several major hubs on the railway, and only then did Dongying formulate an invasion plan because of the railway, and the Huanggutun incident and the Middle East Road incident around the railway. Then the Northeast Liberation War, first of all, the 'four battles and four draws', coupled with the 'three to the south of the Yangtze River, four to protect the Linjiang' siege and annihilation of the Jilin Mountains and ambush warfare, etc., and finally the Liaoshen Campaign to defeat Jinzhou, the entire Northeast closed the door to fight dogs, besieged the city of Changchun, and the national army that could not flee and get supplies 'surrendered without a fight', and finally turned back to Shenyang, less than two months, the whole territory of the Northeast GG.

Then, in the era when there were no railways, only the 'great' Genghis Khan was the 'great' Genghis Khan who won the battle in the northeast in her memory. As nomads, they made their fortune at Dalai Lake, and it was easy to enter the northeast, and one of the armies went south to conquer Liaoyang, Tokyo of the Jin Dynasty near Shenyang. can remember this, thanks to the Mongolian army general who led the troops is Guo Jing's master, Jebe.

Fortunately, the places that the emperors of the Water Conservancy Star People Ji Dynasty did not pay attention to generally did not change much, and the geographical elements of the Northeast were similar to what Gu Ci knew. The Great Wall of Yanbei is still there, and the core area of the Lihe Plain is all under the control of Dayu, and it is only a matter of time before the Northeast Plain is taken. Gu Ci sorted out his memories about the Northeast and Inner and Outer Mongolia, and prepared to hand it over to Yuan Yi with Qiang Qiang's homework for a while, compared to the Western Regions, Dayu can take the initiative better, and hopes that there will be no more barbaric killings.

As for the railway, it seems that the technical level of the Industrial Construction Bureau needs to be improved to achieve it!

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Gu Ci excitedly picked a day when the wind and the sun were not early, and she and her husband nested in the small study of the Heart Cultivation Palace, roasting sweet potatoes and chestnuts with the stove while offering treasures.

Stealing half a day of leisure, Yuan Yi put her arm around her, ate tofu, and began to look at the homework of the mother and daughter's cooperation, and asked quite funny, "This is also the history of geographical advantages?" ”

"I don't really believe in the argument that 'the time is not as good as the place, and the place is not as good as the people'. Otherwise, why did Uncle Liu Huang and Zhuge Kongming of the Three Kingdoms lose to Wei Cao Cao in the end? Gu Ci herself has not been exposed to systematic geopolitical theories, but she very much hopes that Yuan Yi can consider strategy with the objective conditions of geography in addition to the Chinese tradition of focusing on humanities and history, and not fall into the 'clear talk and misguided country' that occupies the moral commanding heights, "The so-called 'follow the trend', this 'potential' should refer to a certain law, and the conditions for the formation of the law have hardly changed for thousands of years only 'geographical advantage', so from this point of view, it should be the most objective!" ”

"Aifei's words are indeed reasonable."

"Don't laugh!" Gu Ci screwed a big palm stretched into the ** in embarrassment.

"Good, good!" Yuan Yi kissed deeply and soothingly, "Why don't you think about how to govern the Northeast and the desert after they are defeated?" I'll finish reading it in a while, let's talk about it? ”

He didn't think there was anything wrong with the current strength to clean up the Mughurs and the Bohai Kingdom, but he was thinking more about the future, so he wanted to know more about the 'Manchu Qing' in Gu Ci's mouth, and now it was just right to look at it together.

The eight Tai half of the Qianyi tribe, which had been defeated by the Zhenbei army, all originated in the steppe of the Dalai Lake Basin, and only the Kalang Department went south from the 'Great Lake Basin' between Yanran Mountain and Jinwei Mountain, and could not enter the Jungger Basin, so they had to go to Fushun to 'do business', hook up with other large troops, and fight the grass valley together. It is said that the birthplace of the Liebarian tribe is also in the 'Great Lakes Basin', and although there is a lake and a basin, the saltwater lakes and desert pastures nourished only by snow water are not satisfactory. If Kulun City is the location of the 'Dragon City' of the royal court, it is obvious that the beggar tribe rose to become the boss of the grassland and occupied Kulun, while the Lieban tribe was a good horse boy and succumbed to the beggar tribe in order to leave the wasteland between the two mountains and come to the eastern Dalai grassland with better resources.

"The garrison of this Great Lake Basin is in the area of Zhao Xincheng (Checheerleg)?"

"Inside," Gu Ci pointed out to him the map he had drawn from memory, "At that time, this place was called 'Tangnu Wulianghai', and the Manchu Qing Dynasty set up a 'General Uriya Sutai' here, and later ceded this large area to the Rakshasas. ”

It turned out to be the territory of the right king of the Han Xiongnu.

Yuan Yi sneered, "Just give it away?" ”

"Foreigners, I always feel that it's a big deal to return to my hometown, the iron-clad battalion and flowing soldiers, cutting the land of the Central Plains, has nothing to do with them."

In essence, there is no difference between the Monghurs, the Xiongnu, the Turks and the Qianyi, they are all nomadic people who wander down the desert plateau. Those who entered the Western Regions from Junggar and were collectively called the Xiongnu, those who retreated to the Western Regions and continued to go west were called Turks, and several tribes who had been rushing to Changchun City were called Qianyi. The 'Tatars' in the Western population may not be interested in the Western Regions and the Central Plains, preferring the desert iron horses of the European plains. Previously, Ah Sheng's analysis of the desert was also based on geography, discussing the similarities and differences between the Xiongnu Empire and the Turkic Empire, and now the Mughal people are also divided into east and west roads to the south, which shows that without Da Yu's knowledge, the desert plateau has completed a new round of power replacement, and now it is just a reshuffle, and the Mughurs will replace the Qianyi and Xiongnu, and make the same choice on the same land.

History is nothing but a cycle of déjà vu.

Thinking of this, Yuan Yi began to seriously think about the word 'geography' she said. "Tell me, what do you know about the relationship between the Manchus and the Muguls?"

Gu Ci heard that he had been pondering for a long time and finally asked about this topic, and began to talk about it as if he had been beaten with chicken blood, and the two of them asked and answered, and they were very happy. No way, after the baptism of the Qing Dynasty's braided drama and Qing Chuanwen, many things have become common sense, if Yuan Yi doesn't ask, maybe he won't be able to remember.

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The Hubei Ministry with the back of Dayu united against the Bohai State, so that the Bohai monarch Wanyan Qinmao was very congested - people just want to mess up with you, and they will persuade you to fight as a relative, and then take your territory, be good friends with Brother Dayu, and defeat the little wave of hooves together!

Xu Lie was happy to see it, and directly arrested the abandoned people in Hubei to get a good understanding of the situation, and sent them to be slaves, so that he could spend time to see when the war between Hubei and Bohai would start.

Compared with the miserable Western Regions, the huge income of the sea trade and the bumper harvest of the southern country, the small wave of 'the Bohai State dividing the Hubei Province and trying to map the Central Plains' in the northeast did not attract public attention in the newspapers. Outside of Liaodong, it is regarded as an extremely cold place, not to mention the Sanjiang Plain further north, if it were not for the aboriginal Hubei people entering Beijing, the vast majority of Han people may not think that it is a place where people can live.

However, the top people in the Dayu power center all understood that Shenzong had always regarded it as a key point, not only carefully surveying the terrain, but also keeping the uncle there all the time, and the queen had sent people to try to plant corn, wheat, soybeans, sorghum and other products many years ago, and even privately obtained the seeds of 'Lucheng rice' from the Bohai State again through the Hubei Department. Over the years, the Industrial Construction Bureau has selected so many students who are skilled in craftsmanship from Hongdu, most of them are focused on tool transformation, one of the core projects is the steam engine, which has been used in battle-class Fu ships, and now their next goal is to use this big thing to replace the ox to pull the deep plow, or replace the horse to pull the cart.

Now the Bohai State is holding Yilan, the Mughurs are breaking into Baicheng, and the territory of Hubei is a 'land of four wars', and the geographical disadvantage is very obvious, and the Dayu defense line must advance north, including the existing territory of Hubei, and facing Baicheng and Bohai State. The Privy Council is busy with this, and it is imperative that the Bolie Alliance work together to attack the south. The best situation is to deal with the Mughurs who are fighting away first, and then clean up the Bohai State with a base area, so as to avoid fighting on two fronts.

The Privy Council chose 'Kangping', the northernmost hill outside the Great Wall of Liaodong, as a strategic stronghold, east of the Zhelimu Grassland, so as to ensure supplies and support. There is a capital of the Buyeo Kingdom in the Western Han Dynasty on the Buyeo Plateau, just east of the White City, which can be used as an outpost to monitor the movement of the Mughal cavalry. This will be used as a transit point for a comprehensive attack on the Northeast Plain in the future, but it is not appropriate to press the army on Buyeo at present, so as not to provoke the Bohai State. Kangping and Fuyu are the two places of Siping and Changchun that Gu Ci is familiar with, and they are indeed hubs. The river in the area north of Buyeo is wide and wide, and it is convenient for troops and baggage to cross and move on a large scale only during the winter freezing period, and it is not considered in this campaign against Mongolia for the time being.

If it was just a defense, it would be enough to occupy Kangping and Buyeo, but unfortunately, His Majesty's goals included the entire desert and the coastline north of Boli, and even post-war matters began to be studied, such as how to circle pastures for the desert tribes, plan post routes, set up temples to be stationed in Xi, as well as measures such as blocking border passes and restricting trade qualifications.

In the whole set of plans of the Privy Council, the 'Mulan' (Harbin), which faces Yilan to the west of the two mountains, is the center of the entire 'Dadan East Road', which includes all the areas east of the Daxianbei Mountain. In addition, there is a place named after the confluence of the three rivers in the north of the Dalai Lake, called 'Lubin' (Manchuria), which can control Mobei in the west, and Boli in the east, and the overall situation of Dadan East Road can be determined. Based on this, it is not a problem to enter Mobei from the west of Lubin and Changchun City, and occupy the royal court and Hanhai area of Kulun City. Continue to attack the Tangnu Wuliang Sea to the west, with the cooperation of Zhaisang Lake and the Jingxi Army in the Western Regions, the desert can be returned!

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Compared with the Western Regions following the Mughal people, the Battle of the Northeast was a major event that required the Privy Council to mobilize the four armies for the first time.

The first is the distribution of the Zhenbei army in various strongholds - Gu Chong's army went to Kangping and faced the Horqin grassland; Ming Du led the vanguard army to Fuyu to camp in An; Zhai Jun is mobile in combat, and Zhelimu to the gate of Baicheng is his range of activities; For the first time, Ren Saiyuan led the army alone, penetrated deep into the mountains and forests east of Kangping, set up a stronghold in 'Ula' (Jilin), pointed at Ningguta, the capital of the Bohai State, and sent troops to contain the Bohai people according to the situation, or waited for a joint attack. Leaving the Hubei Department behind, whether they can block the missing grassland iron horse, or someone fornicating with Xu Lie, is a hidden danger. Therefore, Zhong Nai led 3,000 men and horses to defend the north city of Zhenbei with the Hubei people, and the other Hubei non-combatants moved into Beiguan, which was renamed 'Daning', and came under the jurisdiction of Cui Bo.

The places where the army is about to settle are not uninhabited and borderless, and how to make the local residents accept Dayu and cooperate with the action is the most important thing, so as not to make the Bohai State feel threatened. From the fourth year of Shenzong, merchants and scouts entered the northeast earlier than the Zhenbei army. With their efforts, the Zhenbei Army 'leased' a large piece of wasteland outside Kangping City as the station of the 'hunting camp', and the small town of Fuyu changed a few 'clan elders' and 'head people', withstood the pressure of the Bohai State, and 'invited' the Zhenbei Army to assist in the defense of the Mengwu people who often came to fight the autumn wind.

In addition, most of Anton's army had to cooperate with the north. Shan Gui's position in Longmen was taken over by Xia Bufan, and he will, together with Cui Hang's brother Cui Fang, and Gu Wenkai, lead the Anton Army of Fengjin City and Tianjin Port to Tsushima Island, and from time to time cruise to the Ezo and Kuwu areas, and begin to adapt to the climate of the North Sea Ice Ocean. Later, Choifang's fleet set out from Tsushima Island, occupied Vladivostok, and advanced the army to Lake Mae Tuo (Xingkai Lake). On the Kuwu side, Shan Gui led the army, inserted Boli from the mouth of the Mu River (Heilongjiang), and went south along the Wu River (Ussuri River) to Mae Tuo Lake as the situation depends, and jointly attacked Ningguta, or continued along the Mu River to the west and occupied Yilan. As long as the freezing period and flood season are avoided, under the deterrence of the Anton army, the people who want to come to Bohai will not dare to act rashly.

Because of the departure of Andong's army, the Binh Nam Army also had to make corresponding adjustments, and dispatched Chi Qiyu to lead troops to be stationed in Pity, Thang Long, Da Guang and Saigon to ensure the superiority of troops on the peninsula. On the Tibetan side, Duan Ang led the Nanzhao army from the Southern Silk Road to detour through Shan State and Pi State, borrowed Tianzhu, stationed troops all the way to Metuo, and then went north to Nyingchi, all the way along the Tangbo Ancient Road to Dawang to force Zyakse, pacify and lobby various sects and Tusi, and cooperate with the Ronglin and Pazhu regimes in Qianzang, first isolate the remnants of Sakya by non-force, and then plot against the Ali region.

The Jingxi army was busy restoring and consolidating the cities of the Western Regions to prevent the Mughurs from turning back. However, it was really gratifying to watch Bahhei slaughter all the way from Tash to Zhuo Zhanghai, the westernmost part of Yue, and to cross the Alashan Pass to guard Talas.