Japan conquered Korea for the first time when Japan mourned the emperor (192? 200 years after his death), China was under the rule of Queen Shen Gong at the end of the Eastern Han Dynasty. Emperor Chuai died in the year 200, before the prince was established in Emperor Chuai, and the magical queen was pregnant. It is said that the magical queen expected that there would be a boy in her belly, but later she did give birth to a boy, and she claimed to be in the dynasty and then planned to conquer Korea.
At that time, there were three countries on the Korean peninsula: Koguryo, Silla and Baekje, and Silla was the first to be attacked by the magic queen. In Japanese books, the expedition is described as fantastic. It is said that the Japanese fleet encountered a big storm before going out to war, and even the fish in the sea helped and carried them to the Korean coast. What's even more amazing is that Silla surrendered to Japan without resistance, while two other countries, Koguryo and Baekje, heard that Silla had surrendered and paid tribute in succession. Shen Gong was very satisfied. After humiliating King Silla, she erected a monument in North Korea and left with 80 trophies. Two months after the magical queen returned to Japan, she gave birth to a son, Shen Yinghuang.
When Empress Shen Gong reigned for 49 years, Japan attacked Silla again, Silla was defeated, and then made an alliance with Baekje King. Soon both Baekje and Silla paid tribute to Japan. Whether Japan really conquered Silla and Baekje in history may be exaggerated. During the Tang Dynasty, Japan invaded Korea on a large scale. In the Sui Dynasty, Yang Di failed to conquer Koguryo three times. There are several reasons for failure. First, Koguryo focused on defending Sui Jun at that time, concentrating on elite soldiers, which was hard to shake. Second, the troops of the Sui Dynasty were distracted, attacked long distances, had difficulty in supplying, and returned in vain. The main reason why Emperor Taizong attacked Koguryo was the difficulty in supplying. At that time, many cities in Koguryo were captured, but Anshi City was not captured. Because I stayed in Koguryo for too long, it was difficult to supply, and I failed. If the supply can keep up with the high quality, it can be won. During the period of Tang Gaozong and Li Zhi, Baekje and Japan jointly attacked Silla. The allied forces of the Tang Dynasty and Silla defeated Japan in Baijiangkou and wiped out Koguryo. During this period, the national strength of the Tang Dynasty was strong and it was easy to unify Korea. But Silla and the Tang Dynasty were allies at that time, so the Tang Dynasty did not include North Korea in the territory.
Japan re-entered Korea during the Wanli period of the Ming Dynasty. At that time, the king of the Korean dynasty was quite fatuous, with constant internal party struggles and disrepair of coastal defense. At that time, Toyotomi Hideyoshi unified Japan, and its fighting capacity was very strong, so North Korea was vulnerable at that time. However, after the Ming army entered the war, the situation quickly turned around. Facts have proved that ancient China could not only conquer Korea, but also defeat Japan.
Many of us are still thinking about things in the late Qing Dynasty, such as the defeat of the Opium War, the Sino-Japanese War of 1894-1895, and the imminent Japanese occupation of Korea. We think that ancient China was weak and never conquered the Korean Peninsula. You know, China included Korea in the territory of China during the period of Emperor Wu of the Han Dynasty, and it was not until the Central Plains King gave up Korea in the Tang Dynasty that bi9ng did not include Korea in the territory of China. However, as a vassal state, North Korea paid tribute to the Central Plains dynasty until it was annexed by Japan.
Before the late Qing Dynasty, Japan could not annex Korea because of the revenge of the suzerain. By the end of the Qing dynasty, the Qing dynasty itself was in danger, so Japan could easily conquer Korea. Before the Qing Dynasty, in any dynasty, Japan paid tribute to the Central Plains dynasty. However, Japan saw that the Central Plains Dynasty was too weak, and its ambition expanded to such an extent. When China was strong, the Japanese still served China honestly.