Guanzhong is located between the two major mountain systems in the north and south, and the graben formed by the impact of the Wei River and its tributaries is the Guanzhong Plain. To the south of the original, there are Qinling Mountains that wind more than 400 kilometers from east to west as a barrier. From the west and west, there are Taibai Mountain, Shouyang Mountain, Zhongnan Mountain, Nanwutai, Cuihua Mountain, Li Mountain and the upright and steep Huashan Mountain. It extends to Wushan Mountain in the east; to the north of the original, there are the remaining veins of Liupan Mountain, Long Mountain. To the east are Qianshan Mountain, Qishan Mountain, Qiaoshan Mountain, Liangshan Mountain, Jiushan Mountain, Chaga Mountain, Yaoshan Mountain, and Huanglong Mountain, forming the winding and continuous Beishan Mountain system.

To the west of the plain, Longshan Mountains connect with Qinling Mountains from northwest to southeast. It blocks the western edge of Guanzhong and only leaves a passage for the Wei River. On the eastern edge of Guanzhong Plain, it roars on the Yellow River between Jinling Mountains and goes down from the north. After Hancheng rushed out of Longmen Mountain, the river is wide and becomes a natural ditch at the eastern end of the plain. From the previous description, we can see that the topography of the four holy surrounds of the Guanzhong Plain constitutes the natural defense line as the location of the capitals of Qin, Han and Tang.

The four blocks of mountains and rivers, and the land is rich. They can all dominate the East Hangu, Nanwu Pass, Xisan Pass, Beixiao Pass, and Four Key Lock Pass. It is as stable as a rock. In history, if it is not the civil strife in Guanzhong or the internal rulers are corrupt, it has caused complaints and the morale of the army is dispersed. It is not a few years of hard work to break through just external force.

However, since the end of the Tang Dynasty, the land of Guanzhong has been divided into two parts. Half of it has been divided into the ruling areas of the Tubo people in Longyou. The territory of Guanzhong shrank. The Beixiao Pass was not owned by Guanzhong. Therefore, when Hu Xier lobbyed Zhao Guangmei, he abandoned the Beixiao Pass and replaced it with the Jinlai Pass of Fenyang. However, the Guanzhong Mountains surrounded and there were certainly dangerous passes at the passages for interacting with the outside world. Such as Longguan, Yuguan, Wuli Pass, Linjin Pass, Muhu Pass, Jinsuo Pass, Shimen Pass, etc., it can be said that there are many passes. But it is on the road outside Guanzhong. It has the meaning of "lock key" and plays a control role. It is truly "one man should be a pass, and ten thousand men should not open", and there are only four gates that are easy to defend and difficult to attack. Then there are Hangu Pass, Wuguan, Dasan Pass and Xiaoguan.

Xiaoguan was occupied by the Tubo people for many years, and now it has fallen into Yang Hao's hands again. Then the northern gate of Guanzhong has actually been opened. The Tubo people have fought for years and are constantly smoked. They have long been familiar with the Guanzhong defenders. Yang Hao defeated Shang Boqian with lightning speed. Because the speed is too fast, the Song army in Guanzhong knows nothing about this. They don't know that the Western Xia army is already fierce and swings to move south.

Until Tong Yu, Tie Niu and Ke Feng's evil army rushed to Longshan. Longshan was extremely dangerous. From here, it went east and could control Guanzhong. From here, it looked south. It could seize Hanzhong and Bashu. Longshan was the remnant of Liupan Mountain. It stretched for hundreds of miles. It was the right auxiliary of Chang'an. There were Baoji and Dasanguan in the south. It was dangerous. In Guanzhong, Hanzhong and Bashu were the throats of Bashu. In front of the mountain, there were Longguan, which controlled the main road leading to Longyou.

Yang Hao's order to Xiaoliu, Ke Fenge and others was: to seize Guanzhong as quickly as possible; to minimize losses as much as possible. Use more wisdom, use less force, and those who can plan with peaceful means will never use force. Because the "King of Qi Zhao Defang" played by Princess Yongqing participated in it. He was destined to fight against Song. It was both fighting and pulling. This was not an absolute conquest. Excessive killing would arouse the anger of the Song army and not use the implementation of the plan.

As for the specific measures, there was no such thing as the fighter's change in an instant. It was not something that Yang Hao could control. Therefore, he had full power to command the three front enemies. This was completely different from Zhao Guangyi's work. He wanted to directly command the specific actions of one team and one team. Zhao Guangyi used this method. However, there was no telephone and telegram in that era. He was possessed by Thousand Hands and Thousand Eyes Guanyin, and could not command the generals and subordinates at the first level of the 300,000 army at most. At most, it was the army and battalion level. It was precisely because the authority was too heavy. When the Liao army raided into Youjing, all Song troops around did not dare to act rashly. They could only guard their own formation and watch the enemy enter the city. It was precisely because of this that Zhao Guangyi lay on the donkey cart and fled. The army of various ranks immediately had no heads and retreated indiscriminately. From invincible battle to defeat.

Yang Hao paid great attention to military power in military construction. He drew on some of the advantages of the Quan Army in the daily construction and training of the army. However, the specific command power for warfare was absolutely decentralized and the front-end command personnel were given full autonomy.

Tong Yu led the army to the south and happened to meet Barcelona escorting Shang Bo Qian back north. He immediately had a plan. So he ordered someone to report to Yang Hao. After obtaining his consent, he took Shang Bo Qian and rushed directly to Longguan.

The commander of Longguan was Zhang Tai and Shang Bo Qian who was across Longyou. He was supported by the Song court. Tong Yu had been under Shang Bo Qian's men for so long. Naturally, he knew about this. In fact, most of the Tubo generals in Longyou knew about this. With such strong support, it was Shang Bo Qian's original prophecy. How could he not tell him? As a general of the gate, Zhang Tai knew about these inside stories. Tong Yu even knew that Shang Bo Qian had invited Commander Zhang to have wine, played with women, and gave him his precious sable fur robe. At this time, he just used Shang Bo Qian as a stepping stone to achieve the order that Yang Hao had the least losses and the greatest benefits.

There is no suspense in the Battle of Longguan. This heroic pass has no strong enemies from all directions. Over time, the defenders have long been lazy. When they see Tong Yu's army dressed in a panic, they see that Shang Boqian, who is still breathing a breath, have no doubts. They immediately turn on and let them in.

The Longguan Fortress easily fell into Tong Yu's hands. Tong Yu left a small number of troops to guard the disarmed Song army. He continued to run forward without stopping, bypassing Baoji and heading straight to Dasanguan.

He knew that behind him, all kinds of soldiers and horses came continuously. His next target was Dasan Pass. Once Dasan Pass was obtained, Baoji City between Longguan and Dasan Pass was just a lonely boat in the sea. It could be overturned at any time.

Tong Yu came out of Longguan.≤x≥The speed was much better than before.≤x≥Because he made many siege equipment in Longguan.≤x≥ and some heavy weapons such as bed crossbows used to defend the city were also brought. DaSanguan only has more than two thousand defenders.≤w≥But the terrain is dangerous. <.>The attack is difficult. Tong Yu began to fall into a hard battle.≤n≥The combination of Tong Yu and Ke Fenge Eye is really suitable. Tong Yu collided with the mountains and plains to fight.≤t> Although he had done many siege and siege when he was in Bashu, he actually had no special offensive and defensive means. But Ke Zhenye was not. Looking at the entire Hexi. Except for Yang Jiye, no one is more capable than him. The fastest/station//address

Since he is proficient in various defensive methods, he naturally knows the weaknesses of city defense. Dasan Pass is an important pass in Guanzhong. However, the method of defending the pass is much inferior to him. Tong Yu handed over the command power to Ke Zhen'e. He was fully responsible for conquering Dasan Pass. Ke Xi'e shook his spirit and developed his skills under the Great Enemy Pass.
Chapter completed!