North Korea's famous national hero, patriotic anti-Japanese star and outstanding strategist. In the Great Patriotic War of Renchen, he commanded the North Korean navy to defeat the invading Japanese navy many times with excellent military strategy, and won a series of maritime battles, which made great contributions to the final victory of the whole Great Patriotic War.

Since 159 1, Japan has been actively preparing for the war of aggression against Korea. When the country was in danger, Li Shunchen was entrusted with an important naval position in the Jeollazo Island Water Army. After Li Shunchen took office, he made every effort to strengthen the naval construction and prepare for the war of aggression. He focused on rectifying the army and reforming weapons. In reorganizing the army, he absorbed the fine tradition of the Korean navy and the advanced experience of foreign countries, and reformed the battle formation, strategy and tactics of its navy. And strengthen the patriotic education for the troops, so that the commanders and fighters become brave soldiers loyal to the motherland and good at fighting. Advanced weapons are an important factor in defeating the enemy. In order to improve the fighting capacity of the North Korean navy, Li Shunchen also reformed the "Turtle Boat". The improved turtle boat is more than 10 feet long and 10 feet wide. The hull and the "turtle shell" on it are made of hardwood and covered with iron plates, so it is not easy for enemy gunfire to hurt it. There are also many nails on the iron plate, which makes it impossible for the enemy to climb in the battle. There is a big faucet at the bow with two holes in it. During the journey, you can burn sulfur and other things in the boat and spray smoke from Longkou, which can hide yourself and confuse the enemy. There are many gun holes around the hull, which is convenient for soldiers to fire at the enemy inside the ship. At the same time, there are 10 paddles on both sides of the ship, which paddle together in the battle, sail quickly and advance and retreat freely. The enlarged hull can store more fresh water and grain, which is suitable for long-term and long-distance navigation. After the transformation of Li Shunchen, Turtle Boat was put into mass production immediately, which played a great role in the later Nonchen Great Patriotic War.

1592 in April, the Japanese invaders landed in Busan, North Korea with the superior forces of the army, and at the same time cooperated with the actions of the army with a strong fleet. Li Shunchen commanded the North Korean navy to rise up and fight, defeated the Japanese navy many times, firmly controlled the sea power, and slowed down the Japanese attack.

At the beginning of May, the Li Shunchen Navy and the Japanese Navy launched a fierce battle on the Yupu Ocean. At that time, the Japanese army was arrogant and dismissive of the North Korean navy. As soon as most sailors of Japanese warships landed in Yupu Port, they went into the village to rob. Li Shunchen unexpectedly led 85 ships to dive into Yupu Port, immediately sank and burned 26 enemy ships, and sank and destroyed the enemy ship 18 that night, only one North Korean navy was injured.

From the end of May to the beginning of June, Li Shunchen commanded the battle of Tangpu. On May 29th, Li Shunchen led 23 warships to prepare turtle boats, joined the navy under the command of Yuan Jun, and prepared to attack the Japanese positions in Sichuan Ocean. After arriving at the scheduled place, Li Shunchen found that the terrain occupied by the enemy was dangerous, which was not conducive to the attack. So he improvised and adopted the tactics of retreating to advance, lured the enemy out of the port and prepared to annihilate the enemy in the ocean. When the Japanese navy saw the North Korean navy retreat without a fight, it mistakenly thought that it was timid, that is, it went all out to pursue it. When the enemy chased the sea area favorable to the North Korean navy, Li Shunchen turned back unexpectedly, with the "turtle boat" as the pioneer, rushed into the enemy line, ran around, shuttled back and forth, and fired all kinds of artillery at the same time, smashing or sinking the enemy ship. Other warships are not to be outdone, arrows and guns are fired in unison, and the Japanese fleet is in chaos. After a fierce battle, the ships pursued by the Japanese army were either sunk or captured. On June 2, Li Shunchen led a fleet to attack the enemy of Tompu, causing the turtle ship to rush to the enemy flagship and smash it. At the same time, it set fire to all 2 1 enemy ships in Tangpu. On June 5th, Li Shunchen and Li Renqi took the tactics of luring the enemy to go abroad and attacking from front to back, and burned 26 enemy ships. In July, the North Korean navy destroyed nearly 100 enemy ships in the naval battle of Xianshan Island, killing the main force of the enemy navy in one fell swoop.

In order to save the defeat, the Japanese aggressors succeeded in their clever tricks, and Li Shunchen was removed from his post, which led to the total annihilation of the North Korean navy and the occupation of the Xianshan Island stronghold by the enemy.

At this time, under the strong pressure of domestic public opinion, the court re-appointed Li Shunchen as the commander of the Third Navy Division, entrusted with the important task of saving the nation from extinction. But at the same time, the court thought that the navy had collapsed and it was difficult to defend the enemy, so Li Shunchen led his troops to land. Li Shunchen, who was in danger, looked at this situation from the perspective of a military strategist and thought that the naval division should never be abolished. On the basis of the remaining 12 warships and 120 sailors, Li Shunchen first supplemented some troops, stepped up training, and then re-selected a new naval base. Li Shunchen carefully analyzed the strength of both sides and other factors. Obviously, the enemy has an absolute advantage in strength. If we want to win, we must make use of our geographical position, that is, use favorable terrain to attack the enemy. At the end of August, after Li Shunchen commanded the North Korean navy to repel eight enemy ships that had come to sneak attack, he took the initiative to retreat to Bibo Pavilion in Jindao, which was in dangerous terrain. Li Shunchen knows the terrain in this area like the back of his hand: there are small islands ahead, and dozens of warships can be hidden in the harbor; More advantageously, there is a narrow strait in this sea area, namely the Liang Ming Strait. The tide ebbs four times a day here. Li Shunchen thinks this "narrow road" is a good battlefield to kill the enemy. He sent people to secretly set iron ropes and wooden stakes at the east and west exits of the Liang Ming Strait in order to prevent enemy ships from sailing at high tide and provide an ideal place for the North Korean navy to catch turtles in a jar at low tide.

On September 16, the Japanese army launched an attack on the North Korean navy with 330 warships and more than 20,000 troops. In the case of disparity between the enemy and the enemy, Li Shunchen had answers and calmly responded. He first sent several warships to attack enemy ships, and introduced a large number of enemy ships into the Liang Ming Strait. Soon, the tide receded and the enemy ships were secretly set with iron chains; The stake is blocked and it is impossible to drive out. Li Shunchen immediately sent the navy to fight back, sinking more than 30 enemy ships, warships 12, and killing more than 4,000 people. This is the famous "Liang Ming Victory" in the history of North Korea, and it is also a brilliant example in the history of the world navy.