Answer:
The Chinese Invasion, and response against the UN's Invasion of Korea.
Explanation:
During WW2 the Soviet Union, and United States Of America did joint invasion of Korea, and after Japan had surrendered, The Small land mass was divided in two parts, the North getting occupied by the Soviets, and the South getting occupied by the Americans. Soon after letting Korea go as a puppet two powerful men, Syngman Rhee and Kim Il Sung had tried to conquer the other. North Korea started off with a lot of benefits from the Soviets, such as weapons and military advisors. Meanwhile due to Rhee's claims to start a first strike on the north, the USA refused to give weapons to South Korea, meanwhile North Korea decided to invade and conquer the south, due to lack of troops and weapons the north soon surrounded the South at Pusan. After the UN sent their troops into the South the North was slowly getting pushed back. Eventually they had launched a surprise invasion at Inchon, and had set up two beach heads, Blue Beach, and Red Beach. Eventually they managed to link the two beach heads up and take Inchon, the news hadn't reached the North for weeks, and when it did, they did a quick retreat to Seoul. Eventually the UN kept on pushing North Korea back and back until they had reach close enough to the Chinese Border. In response China invaded the North for themselves, the numerical advantage had helped them encircle many division, and barely letting them get away. This was catastrophic and the USA had commanded to retreat to the 38th parallel. The UN had barely stopped the Chinese from getting past the 38th, and finally the 1953 Korean armistice was signed, and had formally stopped the attacks from both sides.
