I'll go, what this little girl says is really annoying sometimes, am I so terrible, if I stay for a while, something can happen! Shen Feng's face is pale, and only this guy has no self-knowledge, if he stays a little longer, anything can happen.

"Today, a map made out of sand and flour would be more instructive for you. Gu Biluo didn't have the leisure to understand his face, and pointed to this relatively simple 'three-dimensional map': "Yesterday, I talked about the general trend of the world and the chessboard, and today I will talk about the four corners, which are Guanzhong, Hebei, Jiangnan and Shudi. Then he circled four places in the mound.

"These four corners of the land, each with its own unique terrain, has a solid natural barrier and can rely on the mountains and rivers to rely on, can be a kind of attack, retreat can be defended. Among them, Guanzhong and Jiangnan are rich in materials, enough to support, can support a huge military supply, the people are many, the materials are sufficient, and then the structure is in the military, it is easy to form a political center, there is no lack of ancient history in Guanzhong and Shengzhou to establish the capital, it can be seen that at the beginning of the rise of a force, occupy the four corners of the mountains and rivers of the dangerous place, you can establish it, calmly operate, recruit troops and buy horses, and lay the foundation for the future to enter the world. ”

What she said can be understood, Shen Feng listened to it proudly, Gu Biluo glanced at him and said: "Are you a little tired, after you listen to these, you will remember them in your heart, although you also know a lot, but it is beneficial to listen to it again." ”

Shen Feng did not deny her words, some knowledge is that you need to listen and think repeatedly, and then you can get the understanding, Gu Biluo continued: "Let's talk about Guanzhong, one of the four corners, Guanzhong Mountain and four rivers, the Qinling Mountains in the south, the Longshan Mountains in the west, the Loess Plateau in the north, the Huashan Mountain, the Confused Mountain and the southwest mountains of Shanxi Province in the east, and the Yellow River surrounding, it can be said that the mountains and rivers are surrounded by mountains and rivers, and the momentum is reunited. In terms of topography, Guanzhong is a towering position on the eastern plain. ”

"There are mountains and rivers on all sides of the pass, and several important passages are guarded. Those who are in an important position are Hangu Pass, which controls the passage between Guanzhong and the Central Plains, and Wuguan, which controls the danger of the eastern section of the Qinling Mountains, and guards the passage of entry to the southeast of Guanzhong-" In the middle of speaking, he changed his tone and asked: "Do you know where Wuguan is?"

This girl really doesn't know if she asks three questions, Lao Tzu is also a scholar, Shen Feng squinted and smiled: "Wuguan is Kuching Chu, Qin Chu, the border access checkpoint, and to make it clear, it is the north bank of the Wuguan River in Shangluo (Shangluo, Shaanxi), and Hangu Pass, Xiao Pass, and Dasan Pass have become the 'Four Stops of Qin'." Wuguan has a long history, far away in the Spring and Autumn Period to be built, the name is "Shao Xi Pass", and the Warring States Period was changed to "Wuguan". Guancheng is built on a relatively flat plateau between the canyons, with the lofty Shaoxi Mountain in the north and the dangerous in the south. ”

"It seems that you also know a lot about the topography of Dahua, listen to it more, I hope it will be beneficial to you. Gu Biluo then said: "The danger of scattering the pass and choking the western end of the Qinling Mountains controls the traffic throat between Guanzhong and Hanzhong and Bashu, and the danger of Xiaoguan choking Longshan guards the northwest passage of Guanzhong. The four stops are dangerous, the retreat can be self-defending, and the exit can be aggressive. If the situation is favorable, we will go out of the customs and forge ahead, and if the situation is unfavorable, we will close ourselves off and defend ourselves. As a result, Guanzhong has a posture that can advance and retreat, and can attack or defend—"

"There are one hundred and two Qinchuan in Guanzhong, which means that millions of people attack it, only 20,000 people are enough to resist it, with 20,000 people to resist millions of people, the one who is relied on is the danger of its terrain, and Guanzhong Sisai also plays a vital role, we take the Great Qin State as an example, in the third year of King Shenliang of Zhou (318 BC), the alliance of Chu, Zhao, Han, Wei and Yan attacked Qin, and attacked Hangu Pass——"

Gu Biluo said in detail about the situation in Guanzhong, and explained the advantages of Guanzhong's four fortresses and one hundred and two Qinchuan in many classic battles in ancient times, which also talked about the Eastern Han Dynasty, when Shu resisted Wei according to Guanzhong, and only then did he achieve the unification of the three kingdoms.

"The second is Hebei, Hebei is surrounded by mountains and seas, surrounded by mountains and seas on three sides, and the Central Plains in the south. The Yanshan Mountains play a role as a barrier against the southward movement of the nomads from the north, and the security of Hebei and even the entire Central Plains. Juyong Pass, Songting Pass, Gubeikou, Lengkou, Xifengkou and other passes, guard several traffic channels that cross the Yanshan Mountains, the Taihang Mountains are an important barrier on the right flank of Hebei, and the passes such as Bauhinia Pass, Baoma Pass, Jingcheng Pass, and Fukou hold the passage through the Taihang Mountains. In the hinterland of the Hebei Plain, there are some east-west rivers, such as the Juma River, the Tuo River, the Zhanghe River, etc., which can also be used in the war of the Central Plains regime against the northern nomads to establish a river defense system. Gu Biluo turned around and said: "If Dahua of the Rouran clan is forced to change the capital in the future, the Juma River will be the first line of defense. ”

She seemed to have something in her words, did she think that in the near future, Dahua would be forced to change the capital and retreat under the Juma River, but it was really possible, if the Rouran clan accumulated a powerful force to invade the south, it would inevitably force the imperial court to panic, and then in order to take refuge, it could only go south.

-- Let's talk about the southeast corner of the third of the four corners, the defense pattern of the southeast is a multi-level defense system based on the Yangtze River and the Huai River, and the confrontation between the north and the south is mainly based on the Yangtze River and the Huai River. The formation of some important military areas in the south was based on this. The Yangtze River runs through Bashu in the upper part, Jingxiang in the middle, and Wuyue in the lower section, running through the east and west, stretching for thousands of miles, and the upper and lower reaches echo each other, so that the situation in the entire southern region can be complete; in addition, the Yangtze River itself plays the role of a moat against the impact of the iron cavalry from the north. ”

Gu Biluo suddenly said with a solemn face: "Next, you have to pay attention to listen, this time the army on the left road will pass through the north bank of the Yangtze River, I am worried that there will be a sneak attack by thieves, there are two places in the lower reaches of the Yangtze River, one is the quarrying crossing, the other is the scraping of the island crossing, which is located in the upper and lower reaches of Shengzhou, have you written it down!"

This girl didn't look like a person with no purpose, Shen Feng couldn't help but ask, "Why do you think that there are thieves blocking the army on the left on the way?"

Gu Biluo froze at the willow eyebrows, and there was a sad look between his eyebrows: "Manichaeism is the king of thieves in the world, if you unite with thieves in other places and let the thieves along the road block the army on the left, you can let the army lose half of its strength before it arrives, in the Yangtze River area, there are many thieves, and the army on the left is unavoidable, and-"

Shen Feng blurted out: "And this time it's Xiahou Zai-" Halfway through the words, he was stopped by Gu Biluo's eyes, and the rest of the words, the two of them knew in their hearts, Xiahou Tu deliberately let Tang Wei lead the left army, and Xiahou Tu knew that whoever was in charge of the left army would inevitably encounter a sneak attack by thieves, so he let Tang Wei lead the left side. ”

Gu Biluo sighed, and then said: "On the south bank of these two ferries, there are Jingkou (now Zhenjiang, Jiangsu) and quarrying, and Yangzhou and Liyang (now Hexian, Anhui) on the north bank. The Huai River and the Yangtze River play a double role as a barrier. ”

"The people who have defended the south of the Yangtze River in the past dynasties have a more in-depth understanding of the relationship between the Huai River and the Yangtze River, and the discussion of 'guarding the river must first guard the Huai River' can also be seen everywhere, and there are also a series of important towns in the south on the Huai River line, mainly guarding the confluence of the Huai River tributaries and the Huai River, in Huaixi, mainly Zhongli (now Fengyang, Anhui) and Shouchun (now Shou County, Anhui), and in Huaidong, mainly Shanyang (now Huai'an, Jiangsu) and Xuyi. Shouchun is facing Yingkou (the confluence of the Yinghe River and the Huai River) to block the enemy in the direction of the Yinghe River or the upper reaches of the Huai River; Zhongli is facing the vortex mouth (the confluence of the Vortex River and the Huai River) to block the rush of the Vortex River. The main tributary of the lower reaches of the Huai River is Surabaya-"

The candlelight gradually became dim, and the shadows on the ground where the two fell flickered from time to time, Shen Feng put his mind into the vast mountains and rivers, and the mountains and rivers were endless, Gu Biluo was born to be a teacher, and he knew how to be flexible for his teaching, whenever Shen Feng's mind was interrupted, she would change her way.

"Finally, there is the Shuchuan in the four corners, Shuchuan is located in the upper reaches of the Yangtze River Basin, which is a typical basin-like terrain, which is also the basin you just said, in every direction of the basin in the periphery, there are lofty mountains and mountains, and the thickness of its protection is not comparable to other regions. The Three Gorges of the Yangtze River is the channel between it and the east, and the Jialing River and its tributaries are the lowlands of the valley between the Yangtze River and the north. The passage between the two directions is extremely dangerous. The east side is the waterway and the river road, and the north side is the land road and the plank road. These two directions in turn were attributed to two major places: Jiangzhou (present-day Chongqing) and Chengdu. From Jiangzhou to the east, through the Three Gorges through Wushan, can enter Hubei, probably to Kuizhou (now Fengjie) as its portal, Qiantang Pass (also known as Jiangguan, Hanguan) is here; from Chengdu to the north, by the Golden Bull Road, Micang Road can enter Hanzhong, and by Yinping Road can pass Longshang, probably to the Sword Pavilion as its portal, Jianmen Pass is here. Between Jiangzhou and Chengdu, there are several rivers and waterways. ”

This time it's really a long experience, this girl's knowledge is really to an amazing point, if you want to talk about Shen Feng, you can only give a rough idea, but to be as dialysis as her, Shen Feng asked himself if he can't.

The night turned silent, except for the sound of insects, only the sound of two people talking.

As I said last night, the time and place are favorable, and all of them are indispensable, and only when the people are favored can they store grain and support the military needs of a huge country. The hinterland of Guanzhong is an alluvial plain formed by the Wei River, Jing River, Luo River and their tributaries, known as the "Eight Hundred Miles of Qinchuan", with fertile land, convenient irrigation, and suitable for farming. The natural conditions for agricultural production in the southeast region are relatively superior, with the development and development of the south of the Yangtze River, by the time of the Southern Dynasties, the Yangzhou area in the southeast called "under the field" in the "Yu Gong" has presented a rather prosperous and wealthy scene. ”

"Whether a country can form a strong national strength is also very related to the folk customs, national customs and cultural characteristics of this region. Guanzhong is close to Xirong, the customs are vigorous and brave, and the people are accustomed to war; since the Shang Dynasty changed the law, the Qin people have been based on farming and warfare, and the legacy has been far-reaching, forming a national style that is completely different from that of the eastern region, and the Qin and Han dynasties have the saying that "the Guandong is the prime minister, and the Guanxi is the general"; after the fall of the New Han Dynasty, the Xianbei military aristocracy and the northern Han surnamed Tu clan combined to form a powerful force -- the Guanlong Alliance, which later became the basis for the rule of many dynasties. Hebei has been at the forefront of the fight against the northern nomads since the Warring States Period, and the formation of Hebei's fierce and civilized military customs has a lot to do with this. ”

"Since the Zhao Wuling King (Zhao Yong, about 340 BC - 295 BC) restructured, Hu Fu cavalry shooting, Hebei elite soldiers, for the world's male, when the Zhao people cut their hair short, wore a tight clothes, stepped on horseback, a few simple improvement actions, but let the Zhao State in more than ten years of territory greatly increased, changed the situation of the entire Warring States, this is the previous regional customs and culture and the strong connection between the country. ”

On the other hand, a considerable part of the political power in Hebei was established by the nomadic people who grew up and lived on horseback, and the men were skilled in riding and archery, and were born warriors, nomadic hunters in peacetime and wars in wartime, and most of the nomadic people who were based in the Sai were able to accept the advanced culture of the Han people. In this way, the combination of the fledgling vigor of the emerging peoples, the nomadic people's warlike nature, and their acceptance of the advanced culture of the Han nationality formed a force that made it difficult for the Han to compete with them, at least militarily. ”

However, most of the southeastern regimes are housewarming regimes, which are the preservationists of the Zhengshuo in the historical and traditional politics and the preservation of the advanced culture of the Central Plains, so that there is no gap between the local culture and the central cultural area between the southeast region and the Central Plains. The advanced folk customs and culture of the Central Plains thus constituted an important foundation for the southeastern regime. After the fall of the north, most of the regimes that moved to the southeast were able to integrate the southern society by virtue of this, retaining half of the rivers and mountains south of the Yangtze River, and forming a situation of confrontation between the north and the south and the minority regimes in the north; in addition, the people in the southeast region were brave and martial, especially the Huainan area, which was a place where the displaced people migrated and traveled for generations, and the displaced people mostly formed clans, were accustomed to war, and were displaced from the country, and formed armed forces to protect themselves, and the housewarming regime itself was forced by a strong enemy. As a product of forced migration, it is inevitable that it will be partial to peace and unwilling to make progress, so although most of the regimes based in the southeast use the slogan of the Northern Expedition to the Central Plains, very few of the actual Northern Expeditions have succeeded. ”

"Finally, Shuchuan, most of the regimes in Shuchuan were built by foreign nationalities, and these alien nationalities also constituted an alliance, and they also relied on the main strength when they seized Shuchuan, and the inevitable contradictions between these foreign nationalities and the local people in Shuchuan have also become an eternal problem that the people who have been based on Shu have been facing for generations, and this contradiction has greatly consumed the internal strength of the Sichuan regime. In addition, the superior geographical conditions of Shuchuan have made it easy for the people who have occupied Shu in the past dynasties to develop a political idea of local protection, and they are content to be hegemonic, content with secession, and do not want to forge ahead.

Gu Biluo sighed abruptly, but found that the other person was about to fall asleep, and was a little annoyed for a while, and slapped the table hard, and Shen Feng popped up: "Is it dawn?"

(These contents are a bit boring, but I feel that some are necessary, and when I write about the battle in the future, it will be clearer, and I will try to be as brief as possible in the future)