Yunneicheng, the territory of Jizhou in "Yu Gong"; Yu and Zhou were the land of Bingzhou; in the Spring and Autumn Period, it was the land of Beidi; in the Warring States Period, its land belonged to Zhao, and later belonged to Yanmen County of Qin; Pingcheng County of Yanmen County of Han Dynasty.￡∝

In 383, after the Battle of Feishui, the Former Qin, which unified the north, collapsed and perished. The tribes that had previously conquered Fu Jian, all conquered themselves one after another and established their own kingdoms. In 386, Tuoba Gui, the leader of the Tuoba tribe, gathered his old subordinates and ascended the throne. Shortly after ascending the throne, he moved the capital to Shengle because of the remote Niuchuan. In April of the same year, he changed the country's name to Wei, proclaiming himself the King of Wei, known in history as the Northern Wei Dynasty. In the first year of Tianxing (398), Tuoba Gui moved the capital to Pingcheng and became emperor, and was known in history as Emperor Daowu.

Pingcheng, the capital of the Northern Wei Dynasty, is the ancient Yun Neicheng. After the Northern Wei Dynasty moved its capital to Pingcheng, it was expanded on the basis of Pingcheng County of Han. From Tuoba Gui moved its capital to Pingcheng to Emperor Xiaowen of Wei to Luoyang, the Northern Wei Dynasty jointly built its capital in Pingcheng for 97 years. It has been through six emperors and has always become the center of northern politics, economy and culture at that time. At its peak, Pingcheng Jingzuo had a population of one million. It was the largest city at that time. Even the Northern Wei Dynasty later established a vast and thousands of miles around Pingcheng. The Zhui refers to the Great Wall, which means the Great Wall. The Zhui Shangshouwei is the Great Wall built within the scope of Pingcheng Jingzuo. The huge Zhui surrounds the Pingcheng capital of the Northern Wei Dynasty at that time and the Jingzuo area.

This was once the center of the north, and even the center of the whole world. At that time, Pingcheng was divided into imperial city, outer city, and Guocheng. The outer city was twenty miles away, and there were twelve gates around the outer city. The capital city surrounded the south of the palace city, and all built into fangs. The large ones were 400,500, and the small ones were 60,700." The capital area reached the east to Daijun, the west to Shanwu, the south to Yinguan, and the north to Gange. The capital area "went to Shanggu Junduguan in the east, the west to the Yellow River, the south to Zhongshan Aimen Pass, and the north to Wuyuan."

Outside it, four directions and four dimensions were set up, and eight commanders were appointed to command troops to guard the army. The vast and vast Shangsai Fiery was established, and six important military cities were established in the north.

At the beginning of construction, Tuoba Gui took Chang'an and Luoyang in the Central Plains at that time as the blueprint.

A hundred years ago, the Northern Wei moved its capital to Luoyang. Later, the Northern Wei's center of gravity moved south, and Pingcheng's status as the old capital was no longer there. At this time, due to internal class contradictions, it became increasingly sharp with the increasing political stability of the Northern Wei Dynasty. The rulers became increasingly corrupt, and the administration gradually became corrupt, and the north began to revolt continuously. At the same time, Rouran on the northern grasslands continued to be strong and began to repeatedly invade the northern border.

Finally, the Great Uprising of Six Towns in the North broke out, as well as the subsequent Hebei Uprising, the Shandong Uprising and the Guanlong Uprising, and the Northern Wei was eventually destroyed. It was divided into two Weis, and was finally replaced by the Northern Zhou and Northern Qi, until the Sui Dynasty was finally unified.

Pingcheng, the once most prosperous capital of the Northern Wei Dynasty, continued to decline. In just a hundred years, it fell from the world's largest city to a declining small city on the northern frontier.

Before the Northern Wei Dynasty moved the capital, the Daiyin of Sizhou was established in Pingcheng, and the four counties were led. Pingcheng, Taiping, Wuzhou and Yonggu. After the capital was moved, Sizhou was changed to Hengzhou. By the time of Northern Qi, Heng'an Town was established in the former Dai capital, and it was later changed to North Hengzhou. The prefecture was moved to Taiping County 30 miles west of the ancient capital. The four counties of Anyuan, Linsai, Weiyuan and Linyang were established under the Northern Hengzhou. The Northern Zhou Dynasty destroyed Qi and moved the county's capital westward, renamed Yunzhong County, and was affiliated with Heng'an Town in Shuozhou.

After the founding of the Sui Dynasty, the father of Emperor Yang Jian was named Yang Zhong, and in order to avoid taboos, Yunzhong was changed to Yunnei, and the capital was unchanged. He was under the jurisdiction of Mayi County and under the jurisdiction of Heng'an Town. Later, the county was abolished and the second-level division of prefectures and counties was only preserved, and Yunnei was directly affiliated to Shuozhou.

Although the former Pingcheng of the Sui Dynasty was originally the Pingcheng of the Han and Wei dynasties, its address had actually moved westward. Pingcheng, the old capital of the Northern Wei Dynasty, was actually the Heng'an army town of the Sui Dynasty. The former prosperous capital of the Northern Wei Dynasty has long been abandoned, and only more than a thousand towns and border troops were stationed and guarded.

However, although the prosperity here is no longer there, it is still very important in military terms.

Since the founding of the Sui Dynasty, wars with the Turks have been frequent. In addition to the northwest, in the north, the Turks invaded from the frontier, most of them were invaded by Yunnei, and then directly attacked Shuozhou along the Datong Basin. Whenever the Sui Dynasty went to expedition to the Turks, Shuozhou often came out through Yunnei and walked through Yunnei to the ancient road of Yunzhong and then reached Baidao.

Since the Datong Basin, the largest basin at the northeast end of the river, is located between the Guancen Mountains and the southern side of the Mongolian Plateau, the low mountainous outlet in the north of the basin provides a convenient channel for the influx of nomads in the northern part of the basin; the Sanggan River originates from the Guancen Mountains, passes through the Datong Basin, and flows into Hebei. In this way, once the cavalry of the nomads outside the border enters the Datong Basin, they can enter Hebei east along the Sanggan River valley lowlands and knock directly in front of Yongguan; they can also cross the Taihang Mountains from Feihukou and detour to the southwest side of You and Ji.

For the grassland tribe, this is the best offensive entry line.

At the beginning of the Western Han Dynasty, the Xiongnu Maodun Shanyu led a large army to influx, besieging Emperor Gaozu Liu Bang in Pingcheng Baideng Mountain. After rescuing the siege, Liu Bang carried out rest and recuperation, implemented marriage to the Xiongnu in the north, and carried out strategic defense. He once stationed heavy troops here, connecting Yuyang in the east, Shanggu, Yunzhong in the west, Wuyuan in the west, and protected the north.

In the first year of Shiguang in the Northern Wei Dynasty, when Rouran Khan Da Tan heard that Tuoba Si of the Mingyuan Emperor of the Northern Wei Dynasty died, he immediately led 60,000 cavalry to attack Yunzhong, kill and loot officials and civilians, captured Shengle, the old capital of the Northern Wei Dynasty, and surrounded Yunzhong City. Tuoba Tao, the new emperor of the Northern Wei Dynasty, was only sixteen years old at the time, but since he was twelve, he had gone to Hetao to guard the Great Wall to resist the invasion of the Rouran people, and rectified the frontier military affairs very vividly. Therefore, he was very familiar with Rouran's tactics. He opposed the opposition and personally led 20,000 cavalry into the aid of Yunzhong. Rouran people have many ceremonies, and Tuoba Tao, who will be the Emperor Taiwu of Wei, will surround more than fifty times, but in the end, the sixteen-year-old Tuoba Tao defeated the Rouran army with few victory or more. The following year, Tuoba Tao launched a large counterattack, divided his troops across the desert to attack Rouran, and Rouran was defeated again.

In history, there have been too many wars on this land, and countless wars have begun here.

This land is lonely and desolate. Flashes of north wind blow through the dead grass, revealing piles of white bones buried in the soil. You can always find horses, camels, human bones, and broken and rusted swords, guns and arrows that have been rusted. They lie there quietly, decorating this dead ancient battlefield.

Several eagles in the sky drifted across the sky, making a few sharp chirpings from time to time, as if indicating some ominous signs.

This ancient battlefield that had been silent for a long time was finally awakened again. Du Yan, the general manager of Shuozhou, sent three thousand troops under his command, led by Zhao Zhongqing to reinforce Yunnei, guarding the northern end of this important passage.

The intelligence has shown that the Turks are faster than the imperial court expected. They are quite fast, and Datou and Dulan have joined forces. No, that is already outdated information. The current intelligence is that Dulan has already surrendered to Datou after his defeat in the war with Datou last year. Now there is only one Turi Khan who refuses to recognize Datou's position as the Great Khan. Datou came quickly, and his troops had been transferred to the Jinshan line in the eastern and western Turks as early as last year's war with Dulan. When Dulan finally completely surrendered, and the other few khans also expressed their submission, Datou finally launched an attack on the Sui Dynasty.

A few days ago, Changsun Sheng, the envoy of the Tuli tribe in Mobei, sent back an urgent report that Tuli had been defeated and is now fleeing eastward and missing.

Almost as the news arrived, Du Yan's horse exploration had discovered the assembly and movements of Du Lan and Datou's army, and they were coming south.

Hearing that the Turks finally launched an attack, Gao Yang, who had just arrived in Taiyuan, was very surprised. The Turks came earlier and faster than the imperial court expected, Gao Yang immediately adjusted his deployment and asked Shuozhou General Du Yan to send troops to reinforce Yunnei and Heng'an on the front line, and then led a large army north to reinforce.

Zhao Zhongqing led three thousand troops and horses along the Sanggan River.

Zhao Zhongqing was very clear about the order he received, and he had to defend Yunnei and Heng'an no matter what. For the Sui army, if Yunnei and Heng'an were lost, the entire Shuozhou would not be able to defend. Shuozhou was a huge wooden basin, and Yunnei was a gap at the northernmost end. It was a water outlet and also a water inlet. Once this opening was opened, Shuozhou was a smooth road. The enemy could quickly attack the foot of Gouzhu Mountain and attack in front of Yanmen Pass. Although Yanmen was one of the nine barriers in the world, Gao Jin did not want the Turks to attack at the bottom of the pass. What's more, after entering Shuozhou, the Turks could not only quickly attack at the bottom of Yanmen Pass, but they could also go east along the lowlands of the Sanggan River Valley and knock directly in front of Juyong Pass; they could also go from Feihukou to the Taihang Mountain and detour to the southwest side of You and Ji.

Although there is Yang Lin in the east, if he lets the Turks enter Hebei, it will be his serious dereliction of duty.

They finally won the opportunity to command the Northern Expedition, and it was definitely not an ugly battle. They wanted to defeat the Turks in a clean and neat way, and to exchange it for the emperor's appreciation and reward for the crown prince and to add points to the crown prince.

On the ancient road between Yunzhong, there is an army that is beyond the end of sight, which is also marching.

This is the Dulan army who was defeated in the Turkic civil war. With the eyes of the sight, a banner fluttered like a sea, the sword light surpassed the snow, and the spear was like a forest. His wife committed adultery with a Sogdian close servant on her back. Tuli spread the scandal. He angrily killed his wife. Then the Sui Dynasty refused to marry the princess again, but married Tuli. It was so grand that he lost all his face. A sense of anger accumulated in his heart, and Datou moved frequently, constantly drawing up several little khans to betray him. He sent troops in anger, but ended up being attacked by all sides.

Ge, ambushed from all sides, and finally defeated Datou, and suffered a crushing defeat. Nothing happened to be smooth. Datou was determined to be the Khan Khan. Dulan knew that the general situation was going, but he was unwilling to give up the Khan position in vain. He made a request to Datou, first, he had to be the Khan in the east, and Datou had to help him destroy Tuli, and handed over Tuli's territory and the princess of the Sui Dynasty to him. As long as Datou agreed to this request, he immediately surrendered to Datou, and truly gave up the position of Datou, and obeyed Datou's orders from then on.

Datou did not want to agree to this condition at first. In the previous battle, Tuli stood on the side of Datou to help him attack him. Datou wanted to be a peacemaker, but the peace talks failed in the end. Datou proposed the condition to Tuli to hand over the princess of the Sui Dynasty to Du Lan, and also to compensate Du Lan for a large amount of cattle and horses. This result was rejected by Tuli without hesitation. Even Datou asked Tuli to send troops to respond to his attack on the Sui Dynasty, but he refused to agree. In the end, Datou agreed to Du Lan's conditions and killed Tuli. However, Datou also made a request, that Du Lan could be the Khan in the east, and the princess of the Sui Dynasty and the population of cattle and sheep, but he had to send all his strength to attack the Sui Dynasty with him.
Chapter completed!