1, the Tang Dynasty conquered Koguryo for the first time.

During the Zhenguan period in the early Tang Dynasty, the Tang Dynasty defeated the Eastern Turkic khanate, the Tuyuhun khanate and the western countries, and also defeated the Xueyantuo khanate. In 643 AD, Silla sent an envoy to North Korea, informing Goguryeo that it was trying to cut off its access to the Tang Dynasty. Li Shimin, Emperor Taizong, sent an envoy to Koguryo for a truce, but Koguryo refused.

In 644 AD, Emperor Taizong took Sean as the chief officer of Pingyang Road and Li Ji as the chief officer of Liaodong Road, and marched into Liaodong. Xuantu, Hengshan, Gaimou, Medog, Liaodong, Baiyan, British Columbia, Maigu, Yinshan and Houhuang Shicheng were captured, 70,000 people from Liao, Gai and Yan States moved to China, and a large number of Koguryo troops were wiped out in the three wars of Xincheng, Jian 'an and Station, with more than 40,000 people headed by Koguryo.

2. The second conquest of Goguryeo in the Tang Dynasty.

In 655 AD, Goguryeo, Baekje and Mohong invaded Silla, and in the Spring and Autumn Period Silla sent messengers to Tang for help. Cheng Mingzhen, commander-in-chief of Yingzhou, and Su, commander-in-chief of left guard, were ordered to attack Koguryo and defeat Koguryo's army.

In 658 AD, the commander-in-chief of Yingzhou, lord protector Cheng Mingzhen of Dongyi and Xue, the right-handed corps commander, defeated the Koguryo army. In 659 AD, the corps commander Xue Zaiheng defeated the Goguryeo general Windsor Gate.

In 660 AD, Su, the general of Zuo Wuwei, was the chief marching officer of Shenqiu Road in Tang Dynasty, and led hundreds of thousands of amphibious troops such as Liu Boying, the general of Zuo, to cut Baekje. Tang Jun defeated the Baekje Army and destroyed Baekje. Baekje Wang Yici, Taizilong, the second son, Zhucheng surrendered to Tang Jun.

Baekje has 5 provinces, 37 counties, 200 cities and 760,000 households. In the Tang Dynasty, Baekje set up five viceroy offices, including Jin Xiong. In 65438+February and 660 AD, the Tang Dynasty sent troops to attack Koguryo, led by Qi, Su, Liu Boying and Cheng Mingzhen, and stationed around Pyongyang for a long time.

3. The third conquest of Goguryeo in the Tang Dynasty.

In 668 AD, Tang Gaozong sent troops again, and Tang Jun joined forces and advanced into the Yalu River Gate. South Korea sent troops to resist, and Tang Jun bravely attacked, defeated Koguryo army, pursued more than 200 miles, attacked and humiliated foreign cities, and other cities in Koguryo either fled or surrendered.

Tang Jun arrived at the gates of Pyongyang and attacked the city. Gao Zang, the 27th Wang Bao of Koguryo, was captured by the Tang Dynasty, and Koguryo was completely pacified. Tang divided its territory into nine counties, forty-two States and one hundred counties, and set up Anton in Pyongyang to protect reunification. He also ordered the right-back general Xue to be the commander-in-chief of Andong, with 20,000 troops to guard his territory. Since then, Koguryo has ceased to exist in the world.