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Guanzhong is located between the north and south mountain systems, a graben formed by the impact of the Weihe River and its tributaries. In the south of the Guanzhong Plain, there is the Qinling Mountains, which meanders for more than 400 kilometers from east to west. The Taibai Mountains, Shouyang Mountains, Zhongnan Mountains, Nanwutai, Cuihua Mountains, Lishan Mountains, and the tall and steep Huadong Mountains extend to Xiaoshan Mountains in western Henan; in the north of the original, there is the remnant of Liupan Mountains-Longshan Mountains to the east. There are Qianshan Mountain, Qishan Mountain, Qiaoshan Mountain, Liangshan Mountain, Jiushan Mountain, Saga Mountain, Yao Mountain, and Huanglong Mountain, which constitute the continuous Beishan mountain system.

In the west of the plain, the Longshan Mountains connect with the Qinling Mountains from northwest to southeast, blocking off the central and western borders of Guanzhong, leaving only a channel for the Wei River, while on the eastern border of the Guanzhong Plain, the Yellow River roars between the Jinling Mountains, and runs straight down from the north. It becomes the natural boundary ditch at the eastern end of the plain. As mentioned above, it can be seen that the topography of the four holy ring mountains in the Guanzhong Plain constitutes the natural defense line where the capitals of the Qin, Han, and Tang Dynasties are located.

Blocking mountains and rivers, four fortresses and fertile land can be dominated by East Hangu, Nanwuguan, Xisanguan, North Xiaoguan, and four key locks, which are as stable as rocks. In history, if it wasn't for the civil strife in Guanzhong, or the internal rulers were so corrupt that they complained, the army's morale was scattered, and it was only external. It is extremely difficult to break through the force that has not been achieved for several years

However, since the end of the Tang Dynasty, the land in Guanzhong has been divided into two and half, and has been included in the rule of the Tubo people in Longyou. Jinlei Pass replaced it, but there are dangerous passes around the Guanzhong Mountains that communicate with the outside world, such as Longguan, Gaoguan, Wuliguan, Linjinguan, Muhuguan, Jinsuoguan, Shimenguan, etc. can be said to be passes. There are many gates, but they are located on the avenue from the center of Guanzhong, which has the meaning of "lock and key" and plays a controlling role. It is really "one man guards the gate and ten thousand men cannot open it". There are only four gates that are easy to defend and difficult to attack, namely Hangu Pass and Wuguan Pass. Sanguan and Xiaoguan

Xiaoguan has been occupied by the Tubo people for many years, and now it has fallen into the hands of Yang Hao. The northern gate of the Guanzhong has actually been opened, and the Tubo people have been fighting for years. Because Bo Qian was too fast, the Guanzhong Song Army didn't know about it, and didn't know that the Xixia Army had moved southward in a fierce manner.

Until Tong Yu, Tieniu, and Ke Yu'e's mighty army killed Longshan Longshan, it was more dangerous than going east out of the controllable pass. Based on this, looking south, Hanzhong and Bashu Longshan can be taken as Liupanshan The remaining veins stretch for hundreds of miles and are on the right side of Chang'an. In the south, there are Baoji and Dasan Pass, which are dangerous and critical, which are the throats of Guanzhong, Hanzhong, and Bashu. In front of the mountain, there is Longguan, which controls the main road from Guanzhong to Longyou.

Yang Hao's order to Xiao Liu, Ke Yu'e and others is: to seize Guanzhong as quickly as possible; to minimize losses as much as possible, use more wisdom and less force, and never use force if you can use peaceful means to seek it. Because of Princess Yongqing Participating in the role of "King Qi Zhao Defang" is doomed to fight against the Song Dynasty. This is not an absolute conquest. Excessive killing will arouse the hatred of the Song army.

As for the specific measures, there is nothing at all. Fighting opportunities are changing rapidly and Yang Hao is beyond his grasp, so he has given full authority to the three former enemies to command. This is completely different from Zhao Guangyi's personal actions, wishing he could not directly command a team. This method is just that there were no telephones and telegrams in that era. He was possessed by Avalokitesvara with thousands of hands and eyes, and he couldn't command the generals at the level of 30 troops. When the army raided into Youjing, the Song troops from all walks of life did not dare to move rashly and could only guard their own formation and watch the enemy enter the city. It is precisely because of this that Zhao Guangyi fled away lying on the donkey cart, and the troops from all walks of life immediately retreated. From invincible to complete defeat

Yang Hao attaches great importance to military power in the construction of the army. You have borrowed some of the advantages of the Spring Army in the daily construction and training of the army, but the specific command power for the expedition is absolutely delegated to the former enemy commanders. [

Tong Yu led the army all the way south, happened to meet Barca escorting Shang Boqian back to the north, and immediately made a plan, so he ordered someone to report to Yang Hao, and after obtaining his consent, he took Shang Boqian with him and rushed directly to Longguan

The guard of Longguan is Zhang Tai, Shang Boqian, Longyou is supported by the Song court, Tong Yu has been under Shang Boqian for so long, so he naturally knows about this matter, in fact, most of the Tubo generals in Longyou know about this matter. Shang Boqian's original prophecy, how can he not say the truth? As a general guarding the customs, Zhang Tai certainly knows the inside story Tong Yu even knows that Shang Boqian invited Commander Zhang to drink, play with women, and gave him the precious sable fur. At this time, Paozi just used Shang Boqian as a stepping stone to achieve Yang Hao's order to seek the greatest benefit with the least loss

There is no suspense in the battle of Longguan. This grand pass is strong because the enemy is strong from all directions. The defenders have long since slackened. Seeing that the entire army of Tubo soldiers rushed here in a hurry, the Tongyu army dressed in Tubo soldiers saw that Shasha was half dead, and there was still a breath left. Commander Shang Bo Qianzhang has no doubts and immediately switches and lets them in

The Longguan Fortress fell easily into Tong Yu's hands, Tong Yu left behind a small number of troops to guard and disarm, and the Song army continued to rush forward without stopping, bypassing Baoji and heading straight for Dasan Pass

He knew that soldiers from all walks of life would come continuously behind him, and his next goal was Dashan Pass. Once Dashan Pass was obtained, Baoji City between Longguan and Dashan Pass was just a lonely boat in the vast ocean. overturned

Tong Yu came out of Longguan ≤ x ≥ faster than before ≤ x ≥ because many siege equipment ≤ x ≥ were made from local materials in Longguan, and Longguan was used to defend the city, such as bed crossbows and other heavy-duty Weapons are also brought <s> There are only more than 2000 defenders in Dasan Pass ≤w≥ But the terrain is dangerous <> Difficult to attack Tong Yu began to struggle ≤n≥ The combination of Tong Yu and Ke Yu’e is really suitable <e ＞Tong Yu bumped into the mountains and fought against the plains≤t＞Although he had done a lot of business in attacking cities and looting villages in Bashu, he didn’t have any good offensive and defensive methods, but Ke Zhen’e didn’t look at the whole of Hexi except for Yang Jiye. Defenders are better than him, the fastest|fastest\more station address

Since he is proficient in various defensive methods, he is also aware of the weaknesses of the city's defense, so he opened the pass! It is an important pass in the pass, but the means of guarding the pass are not as good as his. Tong Yu took the master The command was handed over to Ke Zhen'e, and he was solely responsible for conquering Dashan Pass. Ke Xi'e shook his spirit and started his skills at the Great Enemy Pass.

The Song army's organization was completely chaotic and defeated. Zhao Guangyi was shot by the arrow and was first snatched by the servants. He went out and fled. Then the Song army scattered and fought each other. There is only one direction: the south.

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