How did Japan invade Korea in the non-Sino-Japanese War?

1592 At the beginning of the year, Toyotomi Hideyoshi, the supreme ruler of Japan, set up an army of 220,000 people and a fleet with hundreds of ships and 9,000 crew members to invade Korea.

1in the spring of 592, Japanese conquerors marched on the Korean coast in batches.

1 batch of troops landed in Busan on May 25th, 1592 by 350 ships. A few defenders and residents in Busan resisted tenaciously, but due to the disparity in strength, the city was finally captured by the Japanese army. 1 The troops did not encounter great organizational resistance, and quickly advanced northward along the Quanning Pass. The second batch of troops that landed on the southern coast advanced northward through Gyeongju, Xiongchuan and Xinning. Almost at the same time, the third batch of troops landed at the mouth of Luodong River, occupied Qingyuan City and advanced into Chunchuan Pass. After these troops landed, Japan transferred its main force and the rest of its fleet to North Korea. Due to factional struggles, the feudal ruling clique in North Korea could not organize resistance against invaders. A few government troops lost one after another. The Japanese defeated the resistance of an 8,000-strong North Korean army, occupied Quanningguan, and defeated another North Korean army in Chungju, and quickly approached Seoul. The Korean court panicked and abandoned the city in June 1592.

In early July, Japanese soldiers invaded Seoul without bloodshed. A North Korean army of 50,000 men from three southern provinces tried to drive the Japanese out of Beijing, but failed. After the Japanese army occupied Seoul, it continued to attack in the northwest and northeast, and was blocked by the strong defense of the North Korean army near the Imjin River. The Japanese army adopted military tactics, pretended to attack and retreat, lured the Korean army out of the fortifications, and then counterattacked and defeated it. The Japanese army occupied Kaesong and Pyongyang, but due to the resistance of the Korean people, it temporarily stopped further advancement.