After Zhao Ta ascended the throne, the Jurchens were defeated one after another, lost a large area of the country, and rushed back to Guanwai, and the living space was greatly compressed. Economically, because the Song and Jin were enemy countries, they imposed a policy of economic blockade, ginseng, mink and other specialties lost their traditional markets, and the land was cultivated by a large number of captive Han, Bohai and Xi people, and the productivity was quite low.

However, the army had to cope with the siege of the Song Dynasty, and the standing army was greatly expanded to 300,000 people, and there was a big problem with the supply of military supplies. If it invades the pass, it is difficult to pass the pass of the Song army. After Ushu came to power, he was immediately faced with the situation of political instability and economic collapse, and attacking Goryeo at this time can be said to be a very correct choice.

North Korea, with its abundant resources and weak military forces, was an ideal target for plunder; Diplomatically, Goryeo adopted a policy of 'making great neighbors', and after the revival of the Song Dynasty, his strength increased greatly, but Jin went downhill, so he actively moved closer to the Song, cut off contact with Jin, and leased Shenmi Island and Busan to the Great Song Dynasty, becoming a containment in the rear of the Jin Dynasty, and it was difficult to concentrate on the Song. By attacking Goryeo, the Wushu could solve both economic and strategic difficulties, and at the same time establish prestige and consolidate power in the midst of certain military victories.

Minmi Island is located in the Gulf of Korea, southeast of the Aplu River, close to the border between Kim and Goryeo, and only 20 miles from the mainland by sea. To the north, it can control the mouth of the Yalu River, threatening the fundamental land of Jurchen; To the south, it corresponds to Dengzhou and Laizhou on the Shandong Peninsula. After the Song army occupied the island, it could send troops north along the Yalu River, over the Changbai Mountain, and deep into the nest of the Jurchens. It is also an outpost position to protect the Great Song Prefecture in the Bohai Bay and contain the Jurchen army. It can be described as an important place for soldiers.

Therefore, after the Song army leased Midao from Goryeo, it became a thorn in the side and a thorn in the flesh of the Jin State, and he wanted to get rid of it quickly. However, due to the constant internal strife, the Song pressed forward by land, so that they had to devote their main efforts to the defense on land, and had no time to take care of this small island in the sea, after all, the two places were separated by a narrow strait. Now that he has the opportunity, of course he is not willing to let it go......

After the Great Song Dynasty leased Shenmi Island, because it was located in a foreign land and was close to the enemy country, it was assigned to the head of the military department in order to facilitate management. The first task after the Ministry of War took over was to build a port on the island in conjunction with the Ministry of Industry. So that 20,000 large warships and merchant ships can be docked here. Because the Yalu River, Qingchuan River, Datong River and many small tributaries in China flow into the Korean Bay, the sediment accumulation caused the bay is not deep, but the tidal range is very high, and there are many rocky islands in the bay, which is not convenient for large ships to come and go, so the port is chosen in the west of the island.

The island is 100 miles in circumference, shaped like a cross, long and narrow from north to south, and there are two remaining veins in the middle that clouds extend from the mountain to form a small bay with a calm water surface. The armpits of the same person can be used as a port. Zhao Ta knew that the Jin Kingdom would not be willing to allow the Song army to stick a knife at its door, and would inevitably find ways to drive the Great Song army away, and the defense facilities must be strengthened. He surrounded the bay with the sediment and stones dug up during the construction of the port, backed by Yuncong Mountain, and built a city shaped like a glaive according to the trend. The walls are two feet high, and they are all built with stones. The middle is filled with mud mud. In the city, the prefect's house, military camps, and warehouses and post houses were built.

In order to defend against enemy invasion from the sea, forts were built at both ends of the bay, which were connected to the city walls. Long-range artillery converted from siege guns and rapid-fire guns and mortars for anti-enemy landings were arranged. Watchtowers, artillery emplacements, and semi-sheltered machine-gun bunkers were built on the city walls, forming a combination of near and far crossfire, which could strike at enemy fleets invading from overseas and destroy enemies who attacked ports.

The north of the island is close to the mainland, and in order to prevent the enemy from attacking from the back, several pillboxes were built along the Yuncong Mountain, which constituted a complete defense system, and could shoot at the enemy from a high position. The observation deck built at the summit offers a panoramic view of the entire island, so enemies can be quickly spotted no matter which direction they attack.

In the eastern part of the city, a sub-city was built as a trading center, and there were restaurants, inns, shops, and repair factories in the city, with tax cards and patrol shops, where merchant ships from all over the world could dock and trade, replenish supplies, fresh water, and repair ships. After a year of construction by tens of thousands of people, the entire project was completed, so that the whole island was divided into two parts by Yuncong Mountain, which were connected by a large road. The south of the island is a gathering area of the Goryeo people, who still maintain their life of fishing and cultivating land, but it has been incorporated into the management system of the Great Song Dynasty.

Because of the proximity of Shenmi Island to the Dengzhou Navy base, the Ministry of War appointed He Wei, the deputy commander of the Dengzhou Naval Army, as the governor of the Great Song Dynasty to stay in Midao, set up the prefect's yamen, manage military and political affairs, and dispatched the navy to form a task force to be stationed on Mi Island. It is organized into a brigade with a marine brigade, an artillery brigade, an engineer brigade, a craftsman brigade, a baggage brigade, and a medical detachment, as well as a detachment composed of two 5,000-strong medium-sized warships and a number of auxiliary ships. With the task force as the defense envoy, he is responsible for the garrison operations of the entire island.

Although the combat units stationed on the island consist only of marines and artillery, the baggage, engineer, and craftsman units are all strictly trained regular troops, and more than 2,000 people can be deployed to participate in the battle in the event of a war, and the sailors on the battleships can also be used as reserve forces when necessary. In addition, there was a civil detachment composed of scribes to deal with civil affairs, and the task force recorded thousands of aborigines and merchants on the island under the jurisdiction of the army, settled disputes according to Song law, established schools to educate the people, collected taxes, and organized village soldiers to cooperate with the Song army to defend against foreign enemies.

The distance between the island and the mainland of Goryeo is only a water, and the distance between the water surface is only equivalent to a Yangtze River, and the north bank is the Xuanchuan and Tieshan Mountains of Goryeo; The distance from the border between Jin and Goryeo was only a few dozen miles, and the water was even closer, and the captive Han people who had escaped from Liaodong poured in one after another, and in less than a year the Han people had accounted for seven-eight-tenths of the inhabitants. The arrival of merchant ships brought prosperity and wealth to the island, which had been dormant in the past.

Some small caravans in Goryeo could not afford to buy large ships to trade at sea in the past, and the export trade was monopolized by a few big chaebols, but now they can go to the nearest island to trade with merchant ships from various countries that call at the port here, and some caravans from the West can also buy goods from Korea and other places here and bring them back along the way, instead of going back and forth to several countries. In just two years, the free port of Minmi Island prospered......

"The newspaper knows that there have been more unidentified fishing boats in the north waterway of the island recently, which seem to be fishing, but they are actually surveying the waterway!" One day in September, Zhang Lan, the defense envoy of Shenmi Island, reported to He Wei.

"Well, I also received a report from the patrol shops in the city, and there are also some people in the city who are sneaking around these days, inquiring about our garrison and the defense of the city, and they have arrested a few spies who have been interrogated and found out that they are sent by the Jurchens!" He Wei said.

"Do you know if the Jin Kingdom wants to send troops to attack us?" Zhang Lan asked.

"There is such a possibility, but neither the Goryeo side nor the country has informed us of the news of the war with the Jin State, and we can't suspect that they are going to send troops to attack Goryeo just because we found the spies of the Jin State!" He Wei thought about it and said, he didn't have a bottom in his heart.

"Our navy patrol fleet has not found any signs of large-scale mobilization of the Jin army, but today some fugitives from the Jin country say that a large number of ships of the Jin army have been assembled in Luzhou in the upper reaches of the Yalu River, and there seems to be a military operation." Zhang Lan said, but still doubted that Jin Jun would make a move.

"The Jin Army's naval army is assembled?!" He Wei gasped and said, "If the Jurchens want to use troops against Goryeo, they don't need to send a naval army at all, they really can't come to us!" ”

"We are alone overseas, once the news of the siege of the Jin army is cut off, the country will not know, and the weather will become cold for more than a month, the sea will freeze, and the ships will not be able to dock, but the Jin army can step on the ice and go to the island, which is very unfavorable to us!" Zhang Lan said worriedly.

"Whether it is true or not, we must be prepared, and immediately order the two warships Weiyuan and Weizhen to leave the port to patrol the open sea; In the name of strong winds in recent days, the merchant ships that docked at the island were evacuated; In the name of preventing the high tide, let the people in the north of the island move closer to the clouds from the mountain, and once there is a change, they will retreat into the city for refuge; ordered each lookout post to strengthen observation, Yuncongshan defenders and batteries entered the position, and the city garrison personnel doubled; Send people to contact the Dengzhou fleet cruising in Liaodong Bay, and let them move closer to us and help defend Mi Island; In addition, collect and store the food of the caravan on the island and deploy it in a unified manner, if there is a fight, I don't know when the siege will be lifted! He Wei groaned and gave several orders in a row.

"I know, my subordinates will do it immediately!" Zhang Lan commanded.

"Wait a minute, you prepare a few more fast boats, and if they find that there is a change, immediately let them go to Dengzhou for help, and report to the emperor!" He Wei added.

September and October were the time when the northwest and southeast trade winds were staggered, and typhoons often broke out, and the island's residents and caravans were accustomed to it, so Ho Wei's evacuation order did not cause panic and followed the order. The residents packed up and moved to the highlands on the island, and the merchant ships pulled anchor and set sail for the Great Song Dynasty or Fusang after the most difficult transaction, and the lively port was quiet for a while, but this silence made people have an indescribable nervousness, as if the people who were overwhelmed by the dark clouds were out of breath, and the soldiers were even more ready to fight back against the enemy troops who landed on the island!

At midnight three days after the 'woo woo ......' combat readiness order was issued, as the tide rose, a little fire suddenly appeared on the sea under the waning moon, and this strange scene was immediately discovered by the sentinels on the watchtower, and the firelight continued to approach the port with the tide, and suddenly they found that the Weiyuan anchored outside the harbor sent an alarm with a lantern 'There is an enemy invasion', and the sentry immediately sounded the horn of warning...... (To be continued......)