The incident occurred in 1019, when the Korean Peninsula was still in the era of the Goryeo Dynasty and the Jurchens were still under the rule of the Liao Dynasty.
This group of pirates consisted mainly of Jurchens, including a small number of Goryeo people. They first attacked the Japanese island of Tsushima in the middle of the Korean Strait, robbed Japan's earliest silver mine, the "Tsushima Mine", killed more than 300 Japanese people on Tsushima Island, and stole all their belongings. Later, they plundered the surrounding Japanese islands, slashed and captured the island's residents, cattle and horses, burned down the houses on the island, and on the way back, the pirates encountered an ambush by the Koryo marine division, and the captured Japanese were sent back to Japan by the Koryo marine division.
Because the Jurchens are not good at shipbuilding, coupled with the typhoons in Japanese waters, the cost of the Jurchen pirates robbing Japan is very risky, and they basically can't grab anything valuable back, so after 1019, the Jurchen pirates never robbed Japan again, and turned to land development.
The reason why the Jurchen pirates robbed Japan
Second, their trade routes with the Northern Song Dynasty were later blocked by the three large fences set up by the Khitans, and those who could have directly attacked the Northern Song Dynasty could only be turned to goryeo envoys as tributes, and the Rewards received by the Northern Song Dynasty were less and less.
Third, the natural resources such as famous horses, gold, mink, deer antler velvet, ginseng, and Haidongqing, which were abundant in the Jurchen region, were plundered by the Liao State in large quantities.
Fourth, the Jurchens could still grab the Goryeo people from time to time, but later the Goryeo people built a large number of fortifications represented by the "Gangdong Six Prefectures" and strengthened the military strength of the Goryeo Marine Division, and the Jurchens became more and more difficult to rob the Goryeo people, and they could only start the Japanese idea.
The record is dismal, and what you grab is equal to not grabbing
This group of pirates harassed and robbed Japan from 1019 AD, snatching a total of 1280 Japanese, hundreds of cattle and horses from Japan, bringing 147 people who brought resistance to Iki Morita and killing all the inhabitants of Iki Island, except for the silver mines on Tsushima Island, they did not grab anything of value at all.
Later, the pirates occupied Noko Island as a base and prepared to stay for a long time, but were defeated by a group of Japanese samurai led by Dazai Kwon's commander Fujiwara Takaya and were driven to sea. After that, the Dazai Kwon commander Fujiwara Takashi strengthened the defense of the coastline, and the Jurchen pirates never found a suitable opportunity to go ashore to seize it, and eventually withdrew from Japan.
The influence of the Jurchen pirates attacking Japan
The first is to make the Jurchens stronger. The Jurchens realized that looting Japan was expensive, risky, and rewarding, and turned to land. Since then, its power has continued to grow, and it has destroyed the Northern Song Dynasty and the Liao State, and even Goryeo has become their vassal state.
Second, it promoted the improvement of relations between Japan and Koryo. On their way home, the 259 Japanese rescued by the Goryeo Admiralty from the Jurchen pirates were given preferential treatment by the Goryeo Admiral, and the Dazai-Kwon Commander Fujiwara Takashi thanked the Goryeo people for three hundred and two gold. After that, the relations between the two countries, which had always been cold, began to change, and the Japanese began to rescue and return the Goryeo fishermen who had drifted to Japan at sea and release the imprisoned Goryeo pirates.
Finally, the samurai power of Kyushu Island was strengthened. Dazai's commander Fujiwara Takashi led the Hao clan warriors of Kyushu Island against the Jurchen pirates, strengthening their own strength. The Japanese samurai's way of fighting before encountering jurchen pirates was "one-on-one", that is, one-on-one head-to-head, similar to singing. Jurchens don't care about you, when they encounter Japanese samurai, they rush up, holding a shield in the front, a spear in the back, a sword in the back, and finally an archer, which initially made the Japanese samurai suffer a lot.
After several exchanges, the Japanese samurai began to strengthen their mounted archery, especially the strength of archers, and the leader of the Hao clan, Kibu Hirohito, once rode alone to the front of the Jurchen station and shot more than 40 Jurchen pirates with a longbow. This invasion of the Jurchen pirates taught many Japanese samurai the Jurchen way of fighting, which played a very important role for their descendants in the subsequent Mongol-Japanese war.