Although the first war against Japan failed, Kublai Khan, who felt very good about himself, thought that after this battle, Japan must have appreciated the might of the Mongol army and would give in because of it, so he sent an envoy again to ask Japan to pay tribute as his younger brother.

But the Japanese didn't give this Xue Chan Khan face, and simply killed the Mongolian envoy, saying that if you fight, you will come to fight.

Kublai Khan naturally did not swallow his anger, and after destroying the Southern Song Dynasty, he began to prepare for the Second Eastern Crusade. The soldiers of the expeditionary force were summoned from all over the Central Plains, Mongolia and Goryeo to the coastal areas to receive training in landing operations, and the food and straw supplies of the expeditionary force were also continuously collected from all parts of the country.

The Japanese had been closely monitoring every move of the Yuan Dynasty, had already learned of Kublai Khan's plans from various sources, and had made sufficient preparations for the upcoming second "Mongol attack".

At this time, Japan's political situation was stable, and the first generation of tyrants, Hojo Tokimune, had far more control over the Kamakura shogunate and the Japanese feudal domains than before, so he was able to concentrate more manpower and material resources to resist the Mongol invasion.

The shogunate and Kyushu requisitioned the people to build a stone wall at Hakata Bay, the most likely area for the enemy to land, to hold back the Mongol cavalry.

As the date of the enemy's attack approached, Hojo Munemori and Hojo Munemasa led elite samurai armies to the coastal areas of Honshu and Kyushu, respectively, and Hojo Munemasa's Jinsai Army later became the main force of the battle. At the same time, the Kyushu feudal domains began to mobilize their militias, and samurai from other parts of Japan also rushed to join the war.

In 1281 AD, the Yuan Empire's huge expeditionary force set off from Jiangsu, Zhejiang and Korea at the same time. The military appearance of this expedition is very spectacular, there are nearly 5,000 large and small ships, about 200,000 troops, including 45,000 Mongols, more than 50,000 Koreans, and about 100,000 Han Chinese, of which most of the Han are newly attached troops (the incorporated Southern Song Army), and the Mongols are naturally the backbone of the expeditionary force.

The northern fleet arrived at Hakata Bay at the end of May, as the Japanese had expected, and while waiting for the southern fleet, the Mongols easily captured several islands in Hakata Bay, slaughtering all the inhabitants and burning all the buildings on the islands.

In early June, the Southern Fleet arrived, and two large fleets converged off the coast of Kyushu, after which the Yuan army began a landing operation, not far from the place where the main forces of the last war had landed.

This time, the Yuan expeditionary force encountered more stubborn and effective resistance, and the Japanese army used the stone wall as a cover to constantly repel the Yuan Dynasty's attacks, and also waited for an opportunity to organize a counter-charge.

One of the most successful counterattacks by the Japanese crushed the main force of the Goryeo Army, and the commander of the Goryeo Army and the deputy commander of the Eastern Expeditionary Army, who had already invaded Japan once, was captured and killed, and several high-ranking Mongolian officers were killed one after another.

The fierce fighting lasted more than a month, and the losses of the expeditionary force were already more than a third, but they still could not break through the stone wall. By the end of July, the Yuan army had run out of food, grass and arrows, and both the Mongols and the Japanese probably expected that the outcome of the war would be the same as the previous one, and that the Yuan army would retreat.

However, on 1 August, a violent hurricane suddenly blew in the Pacific Ocean, and the storm lasted for four days, basically destroying the ships of the Southern Fleet of the Yuan Army, and losing most of the ships of the Northern Fleet. The remaining ships of the Northern Fleet fled the battlefield with the commander and some of the Mongol and Goryeo armies very unkindly and returned to Goryeo. The commanders and some high-ranking officers of the Southern Army saw that they had no way to return to the sky and were unwilling to be cannon fodder, so they could only abandon their large forces and flee the battlefield on the few remaining ships of the Southern Fleet.

At this time, there were still nearly 100,000 yuan of troops left on the beach of Jiulong Mountain, and these people watched the fucking officers abandon them, shouting and scolding their mothers, and everyone fell into a deep despair. Unable to break through the Japanese defenses, they lost their retreat and supplies, and waited only to die on the beach.

Three days later, the Japanese counteroffensive began, driving the remnants of the Yuan army, already half-starved to death, to a narrow area called Octagonal Island, and then attacking in columns.

Most of the Yuan army was killed, and the remaining more than 20,000 were taken prisoner. The Japanese put to death the Mongols, Jurchens, Koreans, Semu, and Han people in the north, except for the Han people in the south, and reduced the Han people in the south to slavery.

Today's Hakata Bay also has a hill called "Moto-Crown-zuka", which is said to be a collective cemetery for the soldiers of the Yuan Army.

In this fiasco, only three soldiers of the Southern Army escaped, and they cobbled together a small boat and luckily drifted back to China. Through these three survivors, Kublai Khan finally learned the truth about the defeat. The deputy commander of the war, Han Jiang Fan Wenhu, was beheaded as a scapegoat, and other officials were also punished to varying degrees.

The Japanese called the second Mongol invasion the "Battle of Koyasu", and the troops invested by Japan in this war were far superior to the previous one in terms of quality and quantity, and the Mongols did not have the slightest advantage in tactics.

According to the post-war summary of the Japanese, the Mongols were not as strong in combat as they thought, and the Japanese samurai outperformed them in all aspects, especially in terms of equipment and combat skills. The superiority of the Japanese was not only in the swords, but also in the iron armor of the samurai, and it was said that the Mongol bows and arrows could not penetrate as long as they were at a little distance.

The samurai in Japan were completely out of production, and they received strict military training from an early age, so it can be said that they could do nothing but kill, and it is not surprising that their combat skills were superior to those of the Mongols. The Mongol records also say that they were good at fighting alone, which can be completely corroborated by the Japanese statement.

It can be seen from this that the Japanese defeated the two Mongol invasions not entirely by luck, but mainly by their samurai class, the Japanese of this class have been trained to kill people since childhood, have high martial arts, and have a high social status, have a good income, can afford sophisticated weapons and equipment, is the main force of the Japanese army, but also the pillar of the Japanese army's victory.

Once upon a time, China's Tang Dynasty also had a group of such military aristocracy, they received strict military training since childhood, each of them could be one as ten, and from a wealthy family, they could afford expensive and sophisticated equipment, they were the backbone of the Tang army, and they were the invincible weapon of the Tang army.

Many people think that the second generation of rich officials and the second generation are people who eat and wait for death and do not want to make progress, this sentence is absolutely wrong in the Tang Dynasty, the children of the powerful families of the Tang Dynasty are very hard-working people, they have received a good education since they were young, both civil and military, they can rely on their own culture to govern the country and the people in the peaceful era, and they can make meritorious contributions with their own martial arts during the war years, and their weapons are all brought by themselves, weapons are the second life of soldiers, in order to ensure that they can kill the enemy on the battlefield and make meritorious contributions instead of giving people heads, The equipment they carry is as good as possible, and they have money in their families anyway, so they can afford to do it.