Emperor Xuanzong of the Tang Dynasty conquered Tobun.

 Danghyeonjong conquers Tobun. Tang Hyeon-jong Yi Yong-gi began an unprecedented large-scale external expansion war in Chinese history to maintain the international prosperity of "Chen Ga-han" during the Tangjeonggwan and Yeonghui periods after his ascension. Considering the situation at the time, Tobun and Dolgwol were the strongest among the various immigrants, and among them, the threat of Tobun was the greatest. Tobun has hundreds of thousands of soldiers, so he overpowered Saramun-India to the south, took pictures to the north, obtained a stone palace to the west, and merged Togokhon to the east to occupy 10,000 areas. Goro Hyeonjong developed a strategy of defending the north and vacuuming the Seogang Tobun. In May 714, (the second year of King Hyeonjong's reign), Topon's prime minister Sangeumjang posted a message to the party's prime minister and asked the House of Representatives to separate the borders between the two countries and unite. Pyeonjong ordered the prime minister to write a reply, and also sent Haewan to the House of Representatives to meet Tobun, while placing 100,000 troops in Zhu-Cheonsu and Longseo to prepare for war. In June, Tobun Prime Minister pledged an oath to the party, and in late August, Tobun's generals Bundalyeon and Geolgeumseo led 100,000 troops and started from Gugok, Haseo, and invaded the country at the same time. Emperor Xuanzong delivered a record to initiate subjugation and dispatched 100,000 soldiers. In mid-October, General Seol Nul of Dang fought with Tobun in Muga-Lim Jo-hyeon and won a big victory. Wang Jun, pastor of the Tang Dynasty, also led 2,000 soldiers and vacuumed Tobun with Seolnul. Bun Dal-yeon, the general of Tobun, stationed 100,000 soldiers in Daeraegok. Wangjun soon selected 700 warriors and decided to dress up as Japanese men and go camping, and rang drums and gongs behind 5 ri to respond. Tobun thought that Prince Dang had come and was greatly surprised and killed about 10,000 people among us. Seolnul was dispatched from Muga and blocked the road, and Wangjun attacked again at night, and Toben-gun was greatly defeated. Seolnul and Wangjun joined the company to chase the enemy to Jangseongbo-Imjo precincts and annihilated tens of thousands of enemy troops before and after. Toben asked for peace, but Emperor Xuanzong refused to allow him to say, "I already swore before, but it was not an oath from my heart, that is, who believes in those who swore again?" Accordingly, Tobun turned his head and vacuumed to the west. In August 722 AD, Tobun immediately surrounded Eoldaseong Fortress, the capital of King Sobal Yul's Molgeunmang. Molgeunmang asked the party for salvation. According to Bukjeong Jeoldosa Jang Soong; Balyul is the preface to Dang, that is, if Balyul collapses, all regions of the West will belong to Tobun." Thus, 4,000 soldiers were sent to march day and night, and tens of thousands of people were killed by cooperating with Molgeunmang and Tobun inside and outside. A few years later, Tobun turned around again and invaded Haseo. In the winter of 726 AD, Silnakra, the captain of Tobun, led tens of thousands of soldiers and vacuumed Daedugok-Dansanhyeon in Haseo Jurang. By vacuuming Gamju-Jangaek, the passage to the West was disturbed. The royal army of Dodok in Liangju tried to counterattack while waiting for the enemy's army to get tired, but just in time, it snowed heavily and Tobun's army retreated to the west because there were many people who froze to death. The royal army burned all the grasses of the retreat that the enemy headed west in advance, and more than half of the enemy's war horses starved to death. In cooperation with Jinju Dodok Jang Gyeong-soon, the royal army chased the enemy to the west of the Cheonghae, acquiring the enemy's weight, sheep, and horses. In September of the following year, Chief Tobun Silnakra captured Guaju-Anseo at once, attacked Okmun soon after, and sent a spy to Dongdolgung Palace to unite and invade the party, shaking the spy. Regarding Silnakra, who has a high dignity and virtue, Dang Do-sa Cho So-sung said he was conspiring with Dangjo using a plan, so Tobun's praise was called in to reprimand him and killed him. Thus, Tobun's offensive at Haseo immediately weakened. In 728 AD, when Tobun vacuumed Atseohobu with some troops, Dang launched a full-scale offensive in areas such as Haseo, Longwoo, and Cheonghae, and the front reached thousands of ri, and Tobun was defeated. In Figure 4-3-5 A.D., in 737, Tobun attacked Balyul (Northeast of Geuksipmii) to advance to each other here and try to win the deduction authority of Seodolgung Palace and Photography. Balyul told the party that he was in a hurry and Hyeonjong asked Tobun to serve in the military, but when Tobun violated the order and captured Balyul, Hyeonjong was very angry. In September of the following year, Hyeonjong dispatched Do-Dok Du-hee, the leader of the ship, as Longwoo Jeoldosa, and appointed Tae Bu-gyeong Wang-wook as Geomnam Jeoldosa-Seong, and divided the military into two provinces. When Tobun sent a large army to support Jungseong Fortress, Danggun was greatly defeated. In order to make up for this failure, Tang hurriedly called the Southern Dynasty in the southeast of Tobun, Mongwiui-Namman called the Pyrahap-Unnamdae-ri-hyeon in the southern part of Taechon. In March 740 AD, Dang made a plan with soldiers against Tobun in Anyongseong Fortress and Yuju-Sacheongakhyeon, and opened the gate to enter Dangbyeong, killing all soldiers of Tobun. In March, when Tobun fought back against Anyongseong Fortress and Yuju, the party also dispatched soldiers to rescue them. Tobun tried to cut the water source of Anyongseong Fortress, but retreated in fear when the spring water rose out as the rock split. Dang renamed Anyongseong Fortress Pyeongyong, and Tobun asked for peace, but Hyeonjong refused. In June 741 AD, Tobun vacuumed Seungpungbo-Cheonghaeho Lake with 400,000 soldiers again and attacked castles such as Gwakju-Cheonghae Hwayonghyeon. The following year, the party deployed 10 thieves to attack Tobun. Hwang Yo-myeong, a long-term governor, led the military to the west and won repeatedly, but was unfairly imprisoned because he said it was monopolized by the prime minister Irimbo. In 744 AD, Wang Chung-sa took over as a long-woohaeseo Jeoldosa. In each war, Wang Chung-sa sent out a lot of spies to take a closer look at the enemy's enemy's enemy's weak tail, so he won every time and contributed. King Hyeonjong ordered Wangchungsa Temple to take Seokboseong Fortress near the Cheonghae Hapnapgo-do, but Wangchungsa posted a message and said, "Seokbo is rough, difficult, and Tobun is guarding it nationwide, so there are more things to lose than to lose." Accordingly, Emperor Xuanzong was very displeased. At this time, General Dong Yeon-gwang volunteered to capture Seokboseong Fortress, so King Hyeonjong ordered Wangchungsa Temple to join forces and fight with each other. Dong did not take over the castle, but rather talked that Wangchungsa Temple stopped his vacuum. Lee Lim-bo, the prime minister, was also concerned that Wangchungsa's reputation was growing, so he accused the prince of the crime and imprisoned him. After the death of King Sobal Yul Molgeunmang, the leader of Buddha, was crowned. Tobun married his daughter to him, and all 20 countries (such as Seokha, Amoha, and northern India) in the northwest belonged to Tobun, and the tribute was never sent to Dang again. In 747 AD, King Hyeonjong appointed Go Seon-ji, the Anseobudo, as the Haengyeongjeoldosa, and led 10,000 cavalry to subdue them. On the way, it took four months to arrive at Leukteukmancheon Stream and Osikguk after falling Hwanseong-Shinganga Polaris and Pamilcheon-Extreme Mirakarak Polaris. King Jilsil Gayeon also led the army and followed the subjugation. Go Seon-ji divided the military into three branches, vacuuming the Lyeonunbo of Tobun, killing 5,000 men and catching about 1,000 men. King Sobal Yul's Sosangriji and Princess Tobun were lured and captured to conquer the country. After this war, the road to Tobun was cut off due to the slow progress, and the party restored its ruling status in the east of Hamhae.

Emperor Xuanzong spent almost all of his defense potential against Western countries, although Tobun failed every time during the 30-year war against Tobun and Muhu, Zhongjong, and Yein changed the phase of the victory and defeat in operations against Tobun. Looking at the Tang's 100-year foreign war, the Taejong and Gojong periods focused on expanding wars to the outside world; the Muhu periods focused on defense in the foreign war; and the Hyeonjong period mainly focused on subjugation to maintain the rule. What can be seen in the course of the war is that the state is strong and stable in the country becomes the basis for the victory of the war; the state's political system, especially the system of hiring talent, is related to the rise and fall of the state. It was all because there was a wise action for Tang Tae-jong to win the Eastern West and to revive the international prosperity of Tang's "Chengahan."