Chongseong has become a place where business travelers gather, and it is impossible to completely prevent other scouts and sentinels from infiltrating as business travelers, and the mobilization and preparation for sending troops to Jeju Island are carried out in Heseong.

In mid-December, a large number of soldiers and war materials were assembled in Hecheng through the water and land channels.

More than 6,000 soldiers, as well as more than 1,000 helmsmen and sailors, including most of the personal guard battalion of the infantry division, the second water battalion of Jinghai of the naval division, and the first cavalry battalion of the horse army division, were assembled in Hecheng before 19 December.

The war materials, including 30,000 stone rice grains, were loaded into the ship in Hecheng one after another.

Compared with the beginning of the year, Lin Jian took the sea route north to Jinhai, and there were only five Jinhai-class warships with a load of more than 5,000 stones in Chongzhou. At present, there are five Jinhai-class warships in the Jinghai Second Water Battalion, and there are more than 50 other medium-sized naval warships, including 18 Jiyun-class warships.

Because of the competition and threat of luxury families in the East China Sea, among the many affairs in Chongzhou, the shipyard is the most rapidly developing.

After the kiln drying method matures, the preparation time is shortened from the traditional two to three years to six months.

In the past year, the long-distance shipping capacity of Heishui Ocean Shipping Company has increased by nearly 100,000 stones, and the increase in transportation capacity per stone has almost provided a profit of one or two silver to the Guanyintan Ship Yard.

In addition, the shipyard also provided a large number of warships for the Jinghai camp; Coupled with the previous capital injection of Sun, Zhou and other maritime merchants into the shipyard, the Chongzhou Guanyintan Shipyard invested nearly 400,000 taels of silver in a year, and the total scale of shipbuilding reached 200,000 stone by the end of the year.

In shipbuilding, in addition to the large-scale use of iron nail riveting, the Guanyintan shipyard even began to use large iron castings.

In Lin Bin's impression, an iron sailing ship of the same load was heavier than a wooden sailing ship. In fact, it has been calculated that a steel sailing ship of the same load is even two to three percent lighter than a wooden sailing ship.

It is completely necessary to build a steel-hulled sailing ship, and a thousand-stone ship needs to use up 100,000 catties of good iron, which is not something that Chongzhou's steel production can afford. Low-cost steel plate manufacturing technology should be matured, and there is no time for several generations to accumulate technology, I am afraid it will not be possible, but the use of iron castings to manufacture key components of sea ships can make the ship structure stronger, the technology is not complicated, and the cost can be bearable.

The first iron-making blast furnace transformed by the double-furnace agitation method of Sunda Furnace has increased the steelmaking efficiency by nearly three times; When the three blast furnaces are transformed, Chongzhou's refined iron output will increase to 300,000 jin per Chinese New Year's Eve.

300,000 catties of refined iron, equivalent to 150 tons, in the future generations, it is just a small village-run iron workshop, but in the world, it is a rather awe-inspiring number.

The iron-smelting workshop under the Ministry of Industry of Jiangning produces only 200,000 catties of refined iron every year.

However, there is still a huge gap from the goal of Lin Bin, Lin Jian plans to Chongguan for 12 years, and the output of fine iron in Chongzhou can reach one million catties.

Then it would be necessary to invest more silver to build a taller, larger iron-making furnace.

In addition to the Gongyi battalion, the number of soldiers in the Huaidong Army has reached more than 28,000.

Although the generals of the Huaisi and Shengsi defense lines were able to receive food and salary subsidies from Huai'an, Hailing, and Haiyu County, in addition to civil affairs and the construction of the Hanhai embankment, the military expenditure still overwhelmed the Huaidong Military Division.

The military department is no longer able to come up with more money to support the expansion of many factories, and even has to start drawing profits from the fields to maintain huge military spending.

In order to obtain money to expand their production, factories such as iron smelting had to make high profits by selling goods such as fine armor to the Fuso feudal states such as Kyushu and Honshu.

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"This New Year's Festival, you can't spend it in Chongzhou again, when you go to Jeju, you have to take care of yourself......" Gu Junxun followed him to Hecheng to give Lin Jian a meal, and helped Lin Jian tie the crimson big in the house.

"You have to be careful in Chongzhou, it's ......" Lin Jian held Jun Xun's little hand, she had a happy pulse last month, she was pregnant, although the weather was sunny, the wind blowing from the northwest to the southeast was dry and cold. He didn't want her to come to Hecheng to send it, but he couldn't help her temperament when he suffered this. I want her to be the housewife, let her show her face more, move around, and move around, so that she can take on more things in Chongzhou.

Lin tied his hands tightly, glanced at Yingsleeve who was standing next to him, and all his words were in a flash, so he pushed the door and walked out, not letting them go out to blow the wind.

Song Jia was wearing a Confucian shirt, a sheepskin fur covering the outside, and a folded leather hat, like a handsome offspring. She went to sea with Lin Lian, but Hao Mingyue didn't follow this time.

When Lin Jian and Gu Junxun parted, she stood outside the corridor and waited. Xiaoman, as a concubine, will stay in Chongzhou this time and abide by the rules, but she is an internal canon, and she wants to go to Jeju with Lin Lian.

I really don't know what Gu Junxun thinks about this matter, Song Jia honestly hides outside and doesn't want to annoy people.

Qin Chengzu stayed in Chongzhou to respond in the center, and Zhou Pu, Zhao Hu, Ge Cunxin, Lin Jingzhong, and Ge Changgen in Jeju who crossed east with Lin Lian, Lin Jian had one less strategist who could consult at any time, so he could only bring Song Jia with him.

The north-westerly wind was strong, and there was a southward current along the coast, but the speed was not too fast to prevent the fleet from breaking the waves and heading east. There is a yellow sand ridge in the sea area east of Hecheng, which is not conducive to the passage of large ships, but there is an opening in the rotten water ocean, and it is also a tidal channel in the sea area east of Chongzhou. Except for the old fishermen of the day, no one else knows this deep-water seaway.

At noon, I went out to sea from Hecheng, and in the middle of the day, I saw the lighthouse of Changshan Island flickering in the distance.

This section of the sea is shallow and silted, and it is necessary to take the tidal waterway to borrow the road, and the speed is slow, but after passing Changsan Island, riding the wind and waves, using the star-pulling board to compare the Big Dipper, all the way east, as fast as a horse, at dawn on December 23, I saw the outline of the west coast of Jeju Island.

Located in the southern-part section of the west coast, the Jeju Fortress has long been built with a lighthouse to facilitate navigation and anchorage at night, especially at this time, where a raging fire burns the faint morning light of the eastern sky......

Lin Jian received a letter from Ge Changgen asking for help in Chongzhou, and it has only been half a month, but he didn't expect the Koreans to organize the fourth wave of invasion so quickly, looking at the scale of the fire, this wave of offensive is quite fierce.

The fleet turned off the lights and was silent, and when it was moving forward on the sea with only a faint morning light, and there were still more than ten miles, it was already able to observe the battle situation around Jeju Fortress quite clearly.

To the east and south of Jeju Sai, there were sieges by Goryeo troops, and the port to the west of Jeju Sai had been occupied by the Goryeo navy, and several ships were set on fire. It is unclear whether Ge Changgen took the initiative to abandon the ship and concentrate his limited forces on the shore to wait for reinforcements, or whether the Jeju Sai Navy completely annihilated the Goryeo people, and the Goryeo Navy began to attack from the other side of the dock port, and fierce fighting began on the beach on the inner side of Jeju Sai......

Although there are people in the fleet who are often familiar with the routes of Chongju and Jeju, they are not familiar with the hydrology and geography around Jeju Sai.

The infantry brigade could not bypass Jeju Sai, land on the shore from other places, and besiege the Goryeo people from the flank and rear, but seeing that the scale of the Goryeo naval army's warships was quite limited, there were only four warships comparable to the Jiyun class, which could suppress the strength of the Jeju Saishui army, and it was probably far from expecting that Chongju's reinforcements would come in such a timely manner.

The reinforcement fleet slowly unfolded on the gradually bright blue sea, divided into three tiered attack formations, with one Jinhae-class warship and four Jiyun-class warships as the main ones, forming a cone-shaped formation, and swooping down on the Goryeo naval army gathered outside Jeju Seri; The second array is dominated by two Jinhai warships and six Jiyun-class warships, forming two wings. Lin Jian was behind in the third array, waiting to see the situation of the battle.

The Goryeo navy was concentrating their forces to land from the inside of the dock harbor and form a flank attack on the defenders of Jeju Seri, but they did not expect that a naval army would emerge from the early morning mist and attack them. It was almost less than five or six miles away before he became alert.

All kinds of naval warships in the Jinghai Battalion are equipped with large oars. The sail is borrowed from the wind for the long voyage, and when the battle is engaged, the sail and oar are used together, as fast as a galloping horse. Five or six miles of water, only a stick of incense, the Goryeo navy crowded in Jeju Saigang had no time to adjust the formation. The attack was caught off guard, and even more chaotic, forming a narrow channel between the inner and outer harbors on the headland, and several ships collided together, making a mess.

However, the more than a dozen warships of the Goryeo people in the outer harbor were at a disadvantage in terms of size and number in the face of the first wave of attack arrays of the second water battalion in Jinghai. Before they could reach the port, the Koreans were subjected to the furious fire of more than 20 bed crossbows, and when they approached, bows and crossbows and clay pots filled with fire oil came together. By the time they reached the port, more than a dozen warships of the Koreans in the outer harbor had collapsed and fled in panic.

There were more Korean warships crowded into the inner harbor.

The inner harbor is surrounded by a long headland that stretches out of the coastal hills, and the inner harbor is more than 200 steps wide. First, the Koreans first collided with several ships and blocked the port, and the Korean warships in the inner harbor could not get out.

Ge Cunxin let go of several Korean warships that fled in panic in the outer harbor, blocked the inner harbor, and mobilized medium-sized warships that were good at near-port combat to break through the harbor and completely annihilate the Korean naval army trapped in the inner harbor.

There were about 4,000 Goryeo foot soldiers who surrounded Jeju from the east and south, but they could not help in the fierce battle at sea. Seeing that their own naval army was defeated, the Goryeo people on the shore knew that they could not attack Jeju Sai, so they also gave up the attack, retracted backwards, and withdrew their troops to the east......

Around noon, the battle in the port of Saiwu in Jeju ended with the surrender of more than 200 Goryeo naval troops.

The inner harbor was littered with warship wrecks, and the waterways could not be cleared out in a short time. A large number of ships were moored in the outer harbor, and Lim Jian changed boats from the outer harbor to board the cape to look at the situation inside and outside Jeju.

In the history remembered by Lin Bin, the Yuan Dynasty twice invaded Japan in the east, and was defeated with superior forces; During the period of British colonial expansion, the most important point was to use the high profits of overseas trade to build naval bases around the world at any cost. This can probably be regarded as a lesson of both positive and negative aspects.

Over the past year, a considerable part of the proceeds from Jeju's trade with merchants in Goryeo, Kyushu, and Honju have been retained to build the Jeju Fortress, which has played its due role. Otherwise, he would have led a large army to come, and he would not have even landed on a foothold.

Without a foothold, and unfamiliar with the local hydrology, he came across the sea in a hurry, even if he had superior troops, the defeat of the Yuan Dynasty's eastward expedition to Japan would not have been staged in advance.