In mid-May, the Korean soldier Cho Jushu Li Gui, who was carried away by the victory on Geoje Island, vigorously encouraged Yi Xingzhong to lead his army to attack Tsushima Island, the stronghold of the Tsushima Domain's Japanese invaders, and razed Tsushima Island in one fell swoop.

In the early morning of May 18, Li Xingzhong, who had already wanted to be knighted for meritorious service, could not resist Li Gui's agitation, and in the early morning of May 18, he swore an oath on Geoje Island, and took with him about 300 Tsushima Domain Japanese Invaders captured alive from nearby islands, and set sail again for South Tsushima Island.

Tsushima Island has two islands, North and South, also called Upper Tsushima Island, and South Tsushima Island, also known as Lower Tsushima Island, and there is a narrow waterway between North and South Tsushima that is full of reefs.

At this time, North Tsushima was a sparsely populated island with alpine forests and no land suitable for farming, while the main walled castles of the Tsushima Domain, such as Fuchu, Tamarahara, and Chichi, were located on the southeastern coast of South Tsushima.

At this time, the feudal office of the clan of the lord of the Tsushima domain, or the so-called Tsushima Guardian Mansion, was located in the Fuchu area, where the port of Yanyuan was located.

The reason why the Tsushima domain is also called the Tsushima Fuchu domain is also for this reason.

The entire island of Tsushima is high in the north and low in the south, high in the west and low in the east, and the side facing the Korean Peninsula is high and densely forested, and the coastline is mostly precipitous, making it unsuitable for landing.

Therefore, under the guidance of Li Gui and other Korean generals, Li Xingzhong bypassed the southernmost tip of Tsushima Island, and at noon on 19 May, he led a large army to the port of Itambara on the east side of the Fuchu area of South Tsushima Island.

When Li Xingzhong, Li Gui and others came to the port of Yanyuan with the fleet of the coalition forces, Zong Yoshicheng, the lord of the Tsushima domain on the island, the elder of the Zong family, Yanagawa Tiaoxing, and the old monk Gui Bo Xuanfang, the teacher and mastermind of Zong Yicheng, had already received the news and were ready for battle.

Li Xingzhong and Li Gui found a leader of the Tsushima Domain who volunteered to deliver a letter as a messenger from the captured Tsushima Domain, and took a letter from the Ming Dynasty to send the letter to the port alone.

In the letter, Li Xingzhong and Li Gui demanded that the Tsushima clan hand over the Japanese invaders who attacked the Korean coast, compensate for the losses of the Korean state, and bear the grain, grass and military expenses of the Ming Dynasty's naval fleet to and from Tsushima.

In addition, Li Xingzhong demanded that the Tsushima feudal lord Zongshi open the port on Tsushima Island to the Ming Dynasty's sailor fleet from now on, allow the Ming Dynasty's sailor fleet to dock at the port, and replenish water and rice on the spot.

Li Xingzhong thought that in the case of a large army pressing the border, the Japanese on Tsushima should accept the conditions after some bargaining.

However, what he didn't expect was that after the leader of the Japanese Guards named Yabei went to the island with a letter, there was no news.

Two days later, Li Xingzhong, who had not waited for any news, finally became angry and, at the instigation of Li Gui, ordered an artillery bombardment of Yanyuan Harbor, and then ordered the allied fleet to attack.

The attack went smoothly at the beginning, and a large number of ships in Yanyuan Harbor that did not have time to move were smashed in the harbor one by one by the artillery on the Ming warships.

Under the cover of the shelling of the warships of the Dongjiang Naval Division of the Ming Dynasty, a large number of North Korean troops boarded the coast of Itsuonhara Port on Tsushima Island in small boats.

However, the good fortune of Li Xingzhong and the allied forces under Li Gui also came to this.

Soon after the North Korean troops came ashore, the sound of guns and artillery arose from the shore of Yanwon Port.

The North Korean army, which had rushed ashore first, quickly fell into chaos and then returned from the shore in a rout not long after.

Some of the lucky Koreans fled back to the ship, and some of them were killed on the coast by a large number of musketeers from the Tsushima clan who suddenly appeared.

The musketeers of the Tsushima clan were called iron cannon ashigaru.

It is not for nothing that the so-called daimyo of the Tsushima Domain, which had a small territory and a small population, were able to survive Japan's Sengoku period.

One is that the feudal lords before the Tsushima domain were very politically minded, mainly because Zong Yoshisei's father, Zong Yoshitomo, was more flexible.

When Oda Nobunaga was in power, he took refuge in Oda Nobunaga, and after Toyotomi Hideyoshi inherited Oda Nobunaga's territory, he took refuge in Toyotomi Hideyoshi.

After Toyotomi Hideyoshi died, Toyotomi Hideyoshi's elder Tokugawa Ieyasu cut down the Toyotomi clan and then fought against the supporters of the Toyotomi clan in western Japan, this Zong Yoshitomo saw the direction of the wind and took refuge in Tokugawa Ieyasu in time and submitted to the Tokugawa shogunate.

The second was that the Tsushima clan had a monopoly on trade between Japan and Korea, and was very wealthy, and although the feudal clan did not have many soldiers, it was well armed.

Of course, the reason why the Tsushima Domain has survived is also related to its geographical location, which is far from the Japanese mainland, and is separated from the other major feudal lords of the Japanese mainland by the island of Iki.

Of course, the Iki country on the island of Iki was not so lucky, and was annexed by the Matsuura clan, the lord of the Hirado domain, during the melee of Japan's Warring States period.

Let's say that Li Xingzhong and Li Gui, two people, with the naval warships and the army, attacked the port of Yanyuan on Tsushima Island, and saw that the first batch of thousands of people from the Korean firearms battalion had rushed to the land where the port was located with a sharpshooter with a lit arquebus, and they all thought that they would soon be able to take this port.

But the sudden counterattack on the island made the two people shocked and angry.

After the Korean soldiers came ashore, they were driven into the sea by the Tsushima Clan's iron artillery ashigaru, which had been lying in ambush for a long time.

At the same time, on both sides of the bay outside Yanyuan Harbor, which seemed to be embracing the sea with open arms, many hidden batteries also began to fire cannons.

Fortunately, the batteries set up by the Tsushima clan on both sides of the port of Itsukuhara had a limited range of artillery, and only sank a lot of the small ships of the coalition forces that had entered the harbor before.

However, the small boats that came to the front, as well as many of the coalition boats that carried the Koreans ashore, suffered heavy losses.

And what suffered even more losses was the newly established North Korean firearms battalion brought by Li Gui this time.

Li Xingzhong and Li Gui saw that the Tsushima Domain had already prepared, and the Tsushima Domain soldiers on the shore were also equipped with a large number of muskets, not only the number of Tsushima Domain soldiers and muskets, but also a large number of batteries on the shore, knowing that this was a carelessness of the enemy, they immediately hurriedly ordered the withdrawal of the army.

Li Xingzhong's subordinates were all sailor battalions, and this time they did not disembark from the ship, except for the loss of a number of small boats transporting Korean soldiers to land and fight, they did not lose much manpower.

However, after this landing battle, the 5,000 men of the Korean firearms battalion lost 2,000 at once, and most of the Korean soldiers who came ashore were killed by the enemy's muskets.

A small number of fast runners, although they escaped back to the boat, were also on the way back by boat, and were hit by shells from the shore and drowned in the sea.

After this battle, Li Xingzhong and Li Gui landed on Tsushima Island in one go, so that the idea of Tsushima Domain's softness completely disappeared, and they had to make long-term plans.

After withdrawing to the sea, the angry Korean soldier Cao Jushu Li Gui ordered that the Tsushima Domain Japanese who had been captured in the area around Geoje Island be escorted from the cabin to the deck of his flag ship, and that a total of 323 old and young Japanese would be beheaded in public, so as to slightly boost morale.

Fortunately, it was summer, and there were many uninhabited desert islands around Tsushima Island, some of which were slightly larger, with forests and streams on them, where boats could be moored nearby and then go ashore to rest and replenish fresh water.

In this way, after this time they were defeated by the first arrival in the battle, Li Xingzhong and Li Gui, under the guidance of the guide they brought in advance, found a small island with fresh water more than ten nautical miles north of Itsukuhara Port on Tsushima Island.

While staying there to go ashore to rest and think about countermeasures, he had to hurriedly send someone to Yingzhou Town to ask for reinforcements.

Three days later, the messenger sent to Yingzhou Town Guard had not returned, and the soldiers of the Dongjiang Town Water Division Battalion, who were in charge of guarding at sea, returned to this nameless island in a panic and reported to Li Xingzhong and others that a group of sea ships had been found in the north and were coming in their own direction.