There is often such a small paragraph on the Internet - Sino-Japanese friendship depends on South Korea, and Sino-South Korean friendship depends on Japan. Whether it is Sino-Japanese friendship or Sino-ROK friendship, but it is necessary to have a common enemy, the relationship can be slightly relaxed, which in itself also shows that both China and Japan and China and South Korea are quite incompatible.
The relationship between our country and south Korea can be described as quite deep. Historically, the regime in the Korean Peninsula, where South Korea is located, has mostly been a vassal state of our country, and most of the culture inherited by South Korea has also been passed down from our country. But in fact, The ancestors of Korea were also broad, that is, the gōu (lí) dynasty of 1400 years ago.
The Korean Peninsula is located in the fertile land of the northeast, with many rivers and plains, and is inherently a place suitable for people to thrive. Moreover, the strategic depth and breadth of the Korean Peninsula, the coastline is also quite long, it is offensive and retreatable, and there is a feeling of "wildfires burning inexhaustibly, and the spring wind blows again."
For example, in 244 AD, the Cao Wei regime was disturbed by Goguryeo at that time, so he led a large army in the Northern Expedition and directly destroyed the former capital of Goguryeo, Wadu City, thinking that Goguryeo had been destroyed, the Cao Wei army withdrew, but a small part of the remnants of Goguryeo fled east to the land of Wozu, and after 70 years of making a comeback.
At this time, China was experiencing a famous chaotic era in history - the Wei and Jin Dynasties and the Southern and Northern Dynasties. Although the Jin Dynasty unified the whole country, its national strength was also greatly damaged under successive years of conquest, and the princes of all sides supported themselves and respected themselves, and also opened the situation of the Rebellion of the Eight Kings. Since then, the Central Plains have been in constant war.
At this time, Goguryeo began to fish in muddy waters and continuously develop its military strength. By the end of the 6th century AD, Goguryeo was already unprecedentedly powerful, and its territory was close to that of Liaodong in China, and it also had 600,000 soldiers and horses, and its national strength was extremely strong.
Therefore, when the situation in the Central Plains during the Sui and Tang dynasties finally began to become more stable, the Sui Emperor, Tang Taizu, Tang Taizong, and Tang Gaozong after the beginning of Emperor Wen of Sui all made up their minds to destroy Goguryeo!
In 597, the king of Goguryeo was proud of his stronghold and took the lead in attacking the Sui Dynasty. The following year, Emperor Wen of Sui sent Goguryeo with 300,000 troops, and once reached the city of Pyongyang, but due to the nearly harsh winter, poor grain and grass, rampant diseases, and other reasons, Emperor Wen of Sui's army did not exist in one, so he had to withdraw his troops, allowing Goguryeo to temporarily continue to exist as a vassal state of the Sui Dynasty.
However, Goguryeo, as a vassal state, did not offer tribute to the Sui Dynasty, which provoked the anger of the Sui Emperor and began to conquer the country and tyranny, gathering more than 1.13 million troops to march north, opening the story of the three conquests of Goguryeo.
In 612, an army of more than 1.13 million men began to march into Goguryeo. The army that seems to be extremely powerful is actually just a paper tiger, because many of the soldiers inside are actually temporarily recruited militias, and their combat effectiveness is not strong. Moreover, there were major problems in the Sui Emperor's war decisions, which led to the fiasco of the first conquest.
In 613, the Sui Emperor again personally commanded a large army to attack Goguryeo. However, he was surrounded by Yang Xuangan and rebelled, so the Sui Emperor had to quell the rebellion in the south, and the second conquest of Goguryeo ended hastily, and because of the hurry, many ordnance supplies were left to Goguryeo, which made Goguryeo more powerful.
In 614, the Sui Emperor, who had already quelled the rebellion, once again led an army to attack Goguryeo, and although this war finally made Goguryeo temporarily submit, at the same time, the Sui Emperor was also a heavy casualty of the people, and domestic complaints were rife, which directly led to the demise of the Sui Dynasty.
By the time of Emperor Taizong's reign, the Tang Dynasty was unprecedentedly prosperous, the Four Yi surrendered, and the people lived and worked in peace and contentment, all of whom had the ambition to serve the country. At that time, Goguryeo once again provoked the Central Plains, so in 644, Emperor Taizong of Tang appointed Zhang Liang as the commander of the march and led 3,000 troops to attack Goguryeo.
At the same time, Li Shimin began to appeal to the world, but all capable people and strangers who had the ambition to serve the country could voluntarily participate in the army. Tang Taizong did not wantonly recruit the militia, but recruited the militia voluntarily. At that time, everyone supported Li Shimin, so much so that "raising ten to get a hundred, raising a hundred to get a thousand", and many people joined the army in private clothes, just wanting to sacrifice their lives for the country and make meritorious achievements.
Under such circumstances, Tang Taizong's army won successive battles and defeated Goguryeo without the ability to fight back. However, Tang Taizong was also wounded on the battlefield, and the weather gradually became colder, and the food for the soldiers would be exhausted, so he returned to the dynasty and only used some of the army to continuously attack Goguryeo, so that it could not rest and recuperate, and made a comeback.
During the reign of Emperor Gaozong of Tang, Emperor Gaozong of Tang again sent troops to Goguryeo and destroyed Goguryeo's ally Baekje, leaving Goguryeo alone. The Tang Dynasty generals Xue Rengui and Li Ji were victorious in every battle, and finally beat Goguryeo to the end of the country, and in 668 AD, Goguryeo was completely pacified, and there has been no Goguryeo since then.