Jili Prefecture was one of the prefectures established after the Tang Dynasty destroyed Goguryeo. After the Tang Dynasty pacified Goguryeo, it was divided into nine governors' offices, forty-two prefectures and one hundred counties, and was governed by the Andong Protectorate. Jili Prefecture is the southernmost state at the Liaodong Peninsula.

Since the 28th monarch of Goguryeo was captured by the Tang Dynasty, the country was destroyed in seven hundred years. The territory was divided into nine governors' offices, forty-two prefectures and one hundred counties by the Tang Dynasty. Xue Rengui, a famous general of the Tang Dynasty, was the first Antonian Protector, and led 20,000 troops to pacify Liaodong. After destroying Goguryeo, in order to prevent Goguryeo from making a comeback, the Tang Dynasty forced a large number of Goguryeo nobles and people to western Liaoning and Hebei, with a population of more than 400,000.

During the reign of Emperor Gaozong, Tubo invaded and the Tang Dynasty sent troops to the northwest. Silla took this opportunity to invade the old land of Baekje under the jurisdiction of Xiongjin Governor's Office in the Tang Dynasty. The war between the Tang and Silla broke out. The Silla people secretly incited the rebellion of the Goguryeo remnants. As Xue Rengui led a 100,000 army to aid Tuyuhun in the west, the defense in Liaodong was empty for a while. The Goguryeo remnants Dachang Zheng Moucen led the people to rebel and established his grandson Anshun as the main force. Silla also took the opportunity to seize the entire territory of the Tang Dynasty's original Baekje.

The Tang army was in a dilemma of fighting on both sides, and it took four years to quell the rebellion of the Goguryeo remnants. Then it sent troops to conquer Silla, forcing Silla King Jin Famin to send envoys to Tang to apologize. However, due to the rise of Tubo in the southwest, the court was unable to take care of Liaodong, and Silla finally occupied the old land of Baekje.

Tang fought with Tubo and took a defensive position against the eastern border. He was unwilling to confront Silla for a long time on the peninsula, and wasted manpower and material resources. Therefore, under the favorable conditions of Silla's resignation, he moved the Protectorate from Pyongyang, and appointed the captured Goguryeo King Gaozang as the King of Korea, and served as the governor of Liaodong Prefecture as the Minister of Works. In order to deal with the rise of Silla, the Tang Dynasty had to send Goguryeo King back to Liaodong and use Goguryeo people to govern Goguryeo people. He also sent Goguryeo people who had previously moved to the mainland to Liaodong and use Goguryeo people to deal with Silla people.

This move was a failure. As a result, when Gao Zang returned to Liaodong, he conspired to rebel. However, before he could launch a rebellion, he was discovered. Finally, Gao Zang and his tribe were sent back to the mainland. The Tang Dynasty then changed the Tang Dynasty to serve as the governor of Liaodong. After Quan Yang took office, he "appeased Liaodong. He set up prefectures and counties, recruited redundant taxes, severed labor, and sent the people to please him." He took measures such as streamlining institutions, summoning refugees, and rectifying taxes and labor, and stabilized the Tang Dynasty's rule in Liaodong in just a few years.

During the reign of Wu Zetian, the Khitans rebelled against the Tang Dynasty, first captured the western Liaoning, and then launched a large-scale attack on Liaodong.

The situation in Liaodong was at stake. Gao Dewu, the third son of Gao Zang, who was the governor of Liaodong at the time, stepped forward and "used hundreds of troops to serve as a bandit of 20,000", "defeated the rebel Sun Wan and killed more than ten formations. He also captured 1,000 barbarians." Gao Dewu defeated the Khitan's attempt to seize Liaodong, and strategically cut off the morale of the Tang army when Khitan was in the east, "making the country no worries about the east." For the military achievements of Gao Dewu's army, the Tang court praised "each bounty with a breeze robe, and answered sincerely and memorial to be appointed as a honorary official."

After quelling the Khitan rebellion, the Tang Dynasty basically withdrew from Liaodong and retreated into western Liaodong. The Khitan was beaten by the Tang Dynasty and fell into a century-long downturn. The Goguryeo nobles began to regain their control over Liaodong.

However, at this time, the establishment of the Bohai Kingdom shattered the dream of the Goguryeo aristocracy to rebuild the Goguryeo. The strong rise of the Bohai Kingdom made Goguryeo eventually become a vassal of the Bohai Kingdom.

At this time, the Tang Dynasty had basically given up Liaodong and fought with Tubo in the southwest with all its might. Therefore, in order to win the Bohai Kingdom to suppress the Khitan, it made many concessions to the Khitan and once moved the Andong Governor's Office westward.

The focus of the Bohai Kingdom was not on Liaodong. With the lessons of the war between the Khitan and the Tang Dynasty, the Bohai Kingdom chose to go east, cross the Liao River, protect the northeast of Taibai Mountain, and block the Aolou River. The tree walls were solidified by themselves. From the beginning, the strategy of traveling far away from the east did not show any importance to Liaodong. Since then, the focus of expanding the territory was placed on the southern Yalu River and the Ussuri River basin.

The land in Liaodong is fertile, far better than the bitter and cold areas of the Bohai Sea, but the Bohai Sea did not choose to establish a country here, because the comprehensive occupation of Liaodong means bordering the Tang Dynasty. Once the strength of the Tang Dynasty recovers, it is difficult to ensure that it will not repeat the mistakes of Goguryeo.

Daemon Yi, the son of the monarch Dae Jo-young, once told the new king Dae Wu Yi: "Tang, a great country, I have ten thousand times more soldiers, and I will be resentful to him. In the past, when Goryeo was prosperous, there were 300,000 soldiers and resisted Tang as an enemy, which was powerful. Once the Tang soldiers arrived, they were wiped out. Now we are one of the three in Goryeo, and the king will not violate it." At this time, Bohai's own strength determined that it could not occupy Liaodong in full. It required a lot of manpower and material resources to develop Liaodong, which the Tang Dynasty could not do, let alone Bohai? Therefore, Bohai cleverly chose to develop eastward from the beginning, giving up Liaodong, a territory that was destined to be full of disputes. Let the Goguryeo people occupy it, but they were just secretly controlled.

After the Anshi Rebellion, the Tang Dynasty's last army in Liaodong and western Liaoning, pacified the Lu army across the sea and moved to Qingzhou. After giving up Liaodong, it gave up Liaoxi. The Tang Dynasty fell into a long rebellion. Gao Zang's son, the nephew of Wu Youyi, the nephew of Wu Zetian, and the governor of Liaodong Prefecture, Gao Jianwu took the opportunity to fight against the Tang Dynasty and established Little Goguryeo with the support of the Bohai Kingdom. At this time, the Bohai Kingdom, which was gradually strengthening, completely controlled Little Goguryeo after consolidating Haidong, and indirectly controlled most of Liaodong.

Since then, in addition to the fact that southern Liaoning has been controlled by many Han forces, Liaodong, the northern part of the Sanhan Peninsula and Fuyu have been controlled by the Goguryeo. However, after the Bohai Kingdom gradually weakened, the Khitans rose again. Over the years, the Khitans have been competing with the Lulong army for Yingzhou in western Liaoning, and tribes have continued to penetrate into the area east of the Liao River and gradually invaded Liaozhong.

Thirty years ago, after the eleventh monarch of the Bohai Kingdom, Dayi Zhen, completely annexed Goguryeo, Goguryeo in Liaodong has become a minister of the Bohai Kingdom in its famous form. However, due to the tenth monarch of the Bohai Kingdom, Daxuanxi, the Bohai Kingdom has fallen into a period of decline. These Goguryeo nobles in Liaodong have gradually regained power and gradually escaped from the control of the Bohai Kingdom.

Jili City, the current city lord Gao Dexin, was the descendant of Gao Jianwu after the Goguryeo royal family. Gao Dexin was over 50 years old and the Goguryeo royal family had always held important official positions in the Bohai Kingdom Middle School and held great power. At this time, Gao Dexin was not only the governor of Jili Prefecture, Liaodong, but also served as the Minister of the Zhengzhang of the Bohai Kingdom, and also the Minister of the Zhi Department. The Xuanzhang of the Bohai Kingdom was equivalent to the Menxia Province of the Tang Dynasty. Zuo Pingzhang was an assistant official in the Menxia Province. The Zhi Department was equivalent to the Ministry of War of the Tang Dynasty.

In addition to serving as the Minister of Political Affairs of Zuo Pingzhang of Xuanzhao Province and the Secretary of the Intellectual Affairs Department, Gao Dexin also served as the General of the Zuo Mengben Guard, one of the ten guards of the Bohai Kingdom.

The military system of the Bohai Kingdom was almost the same as that of the Tang Dynasty. It imitated the sixteen guards of the Tang Dynasty, and established ten guards such as the left and right Mengbenwei, the left and right Xiongwei, the left and right Guards, the south and left and right Guards, and the north and left. There were also the left and right Shence Army, the left and right three armies, with a force of hundreds of thousands. Each guard had one general and one general. Zhechongfu was established across the country, which was under the ten guards. Each Zhechongfu had one Zhechongfu, one left and right Guoyi, one other general, one soldier, and five school lieutenants. The military system and official system were almost the same as the Tang Dynasty. Although the Bohai Kingdom began to weaken after more than two hundred years, it still had a population of more than five million and hundreds of thousands of soldiers.

Gao Dexin served as a senior official in the Bohai Kingdom, but in fact he was the same as the three towns of Hebei in the Tang Dynasty, but in fact he had a self-respecting force. Most of the other Goguryeo generals in Liaodong were like this, no different from the independent generals of the Tang Dynasty.

In Jili City, in the Governor's Office.

"What?" Gao Dexin stood up and grabbed the collar of the chief Gao Bing's clothes and asked. Although Gao Dexin was over fifty years old, he had no white hair. He had been in command of the army for a long time. He was tall and had amazing strength, so he raised Gao Bing to the whole person in an instant.

Gao Bing was just a civil scholar. When Gao Dexin was raised like this, his chest was turned blue and he couldn't breathe. Several staff members next to him rushed forward and pulled Gao Dexin's arm away. Gao Bing finally coughed a few times, his face regained a little bloody color, and he touched his neck with his hand and said, "Weiba Mountain City is lost, the eldest son is killed in battle, and all three thousand soldiers and horses in Weiba Mountain City are wiped out!"

"Zhaokang died in battle? Weibashan City was lost?" Gao Dexin took a few steps back weakly, with shock and sadness on his face. Gao Zhaokang is his eldest son, just thirty years old, but he has great temperament. Not only is he good at martial arts, but he is also proficient in military tactics and is deeply supported by Jilizhou. He has long announced that Dekang is the next governor of Jilizhou.

"How is it possible? Weiba Mountain City is five miles long and is built on a cliff. Only a small road can reach the mountain city. The mountain city is easy to defend and difficult to attack. It is one of the five largest mountain cities among the 58 mountain cities built by the Goguryeo Kingdom in Liaodong. Why did it suddenly fall? And Dekang and the three thousand soldiers were wiped out?" Gao Dexin couldn't believe it and asked again.

There was silence below, and no one could answer his answer. In fact, until now, the Changshi only received news that Weiba Mountain City was lost and the entire army was wiped out. As for the situation of the war and how it was lost, he didn't know at all.

Gao Dexin gritted his teeth and said angrily: "What are you still standing here? Go and find out the news quickly. Who attacked the city, how did he break through the mountain city, and how Dezhao and the others were wiped out. I want to know the news immediately."

Everyone nodded slightly and walked out of the Governor's Office with their heads down. In fact, it was not only that Gao Dexin could not accept this result, but also that the generals were the same and hard to believe. In the past, the eldest son Gao Zhaokang, who had always been in the forefront in wars, and his strategy made Gao Dexin praised him die like this. With his ability, even if the invaders are soldiers, at least they can stand by Weibashan City and wait for assistance, how could the entire army be wiped out?

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