Gundam then built a city at Fairy Pass, and ordered Liu Sheng to defend it. In August of the fourth year of Xingping (1276 AD), the remnants of the Jiaozhi army fought in the Fuliang River, Gao Hu and Zhang Yu fought on the shore, Yue Lun rushed through its formation with a water division, defeated the enemy, beheaded tens of thousands of people, because of the drought and shallow water, the Jiaozhi soldiers abandoned the boat and fled, the Song army chased when the river suddenly rose sharply, and then took advantage of the victory to advance, and most of the Jiaozhi soldiers were annihilated. In October, the Song army pursued to the mouth of the abandoned Luohai in Runan Prefecture, the remnants of the Jiaozhi army were annihilated, Chen Huang and Chen Guojun and others escaped only by a few boats, the Song army with the assistance of the local Song people, captured Chen Guojun and his son Chen Quan, and then captured Chen Huang and the prince Chen Yu, and more than 100 people from his clan, all of whom were sent to Beijing. Gao Hu and Yue Lun leveled the chaos in other places, beheaded thousands of people, and built a Jingguan to subdue the Jiaozhi people. Gao Hu then took a boat north into Guangxi, joined the local Song army, and wiped out all the Jiaozhi troops who entered the Song realm.

At this point, only one year after the Song army left the army, it won a complete victory, eliminating the Tran regime in Vietnam, with 46 prefectures, 128 counties, and 2.52 million households. Emperor Zhao Heng of the Song Dynasty was greatly delighted, and the ministers also joined the congratulatory and said: "The Chen father and son violated the heavens and disobeyed the fate, and now they are all arrested by the holy virtues, and the gods and men help the obedience." Zhao Heng said: "The spirit of the ancestors of heaven and earth, the spirit of the gods, caused by the soldiers' lives, what can I do." ”

On November 1, the first commander of the Pingzhang military state Jia Yidao to "eliminate Jiaozhi" edict to the world, cut off the name of the Dayue country established by the Jiaozhi people, changed the whole territory of Jiaozhi to Jiaozhou Road, collected the territory of the Great Song Dynasty, placed 12 prefectures, and set up officials to govern, since then Vietnam has officially become an administrative region of the Song Dynasty. After the Gundam class returned to Beijing, Emperor Zhao Hengte gave a banquet in the Fengtian Palace, and promoted Gundam to be the king of Haiyang County, with a reward of 1,000 taels.

For Sun Hui, this time to pacify Vietnam, the resistance was actually much smaller than he imagined.

Next, he was ready to transform Vietnam according to his own ideas, but he didn't expect that Ye Chuchu would bring him unexpected news after he returned.

Ye Chuchu returned with Du Lili when he moved to Thang Long City with Gundam, and she brought Sun Hui the shocking news that Kublai Khan had destroyed Japan.

Kublai Khan gave up the idea of conquering the Song dynasty after retreating north of the Huai River, but his conquest of other places did not stop with the defeat at the Battle of Xiangfan.

After the Mongols began to rise in the northern steppes, Genghis Khan established the Mongol Empire that spanned Europe and Asia, and forced the surrender of Goryeo, which had ruled the Korean Peninsula after Silla, in 1259 AD. At this time, the Mongol Empire had diplomatic relations with two continents, with Japan being the exception. Kublai Khan was very concerned about Japan's independence from the Mongol Empire, because Japan and the Song Dynasty had close relations, and if the Song Dynasty joined forces with Japan, it would become a major problem for the Mongols, which was absolutely inadmissible. Minister Zhao Bi, who was aware of Kublai Khan's feelings, wrote to Kublai Khan, saying that Japan had been in contact with China for a long time since the Han and Tang dynasties, and that it could send envoys to get through. From then on, Kublai Khan began to put the issue of forcing Japan to reconcile on his agenda.

In the third year of the Yuan Dynasty (1266 AD), Kublai Khan sent Lang Hede, a waiter of the Ministry of Troops, and Yin Hong, a waiter of the Ministry of Rites, to Japan. In his letter of state, Kublai Khan made it extremely clear that the purpose of this envoy was to make Japan follow the example of Goryeo and make peace with the whole country.

At the beginning of his letter of state, Kublai Khan used the words "Feng the King of Japan" to distinguish the political status of Japan from the vassal state of Goryeo, and to indicate the reciprocal relationship between the imperial emperor of Europe and Asia and the unsubjugated state of Japan. Continuing with the submission of Goryeo as a good commentary, it has already indicated that Japan should choose the way out. In the end, it ends with threatening language that will lead to the use of soldiers. Kublai Khan was full of confidence that Japan, which was located on an island, would worship the letters of the great empire that set foot on the Eurasian throne and conquered the four seas as if it were a god. As soon as the national credentials arrive, Japan can come with it. However, Kublai Khan did not know that the political authority of Japan at that time was not in the emperor's court, but in the Kamakura shogunate, and the real power of the shogunate was in the hands of the ruling Hojo Tokimune. The Hojo clan was in power as a samurai, despised the ministers, and was arrogant and invincible, and did not take the emperor of the Great Yuan Dynasty into account at all, and even how powerful the Mongol Empire was at that time was unimaginable to the narrow-minded islanders

In March of the 10th year of the Yuan Dynasty (1273 AD), the Yuan envoy Zhao Liangbi came to Dazaifu from Goryeo and asked to enter Beijing to meet the Japanese king, but the Dazaifu Guardian again refused and was forced to return to China. The failure of the rapprochement efforts with Japan was intolerable for Kublai Khan, who was ambitious and eager to expand. At that time, the Yuan Empire had conquered Goryeo to the east, threatened the Song Dynasty to the south, entered Europe from Central Asia to the west, swept Russia, Poland, Hungary, looked at the world, and saw as far as the eye could see, except for the Song Dynasty, there was only one projectile island country Japan, and Japan and the Song Dynasty at that time had a very close relationship, and official and people-to-people exchanges were very frequent, which was of great help to the Song Dynasty to resist the Yuan. The conquest of Japan can cut off the Song Dynasty's foreign aid path and make it sit still.

Another reason why Kublai Khan wanted to conquer Japan was that Japan was said to be extremely wealthy. According to the "Old Tang Book", it is recorded: "The country of Wa offered amber and agate, amber was as big as a bucket, and agate was like five buckets." The "New Tang Dynasty Book" also recorded: "In Yonghui, the Japanese offer amber, and the agate is like five buckets." "The plundering of wealth is a fundamental characteristic of nomads.

From the tenth year of the Yuan Dynasty (1273 AD), Kublai Khan began to deploy for the war against Japan.

In April of that year, Lin Yan rebelled against the rule of the king of Goryeo, and Kublai Khan took the opportunity to send the Yuan army to Goryeo commanders Xindu and Hong Chaqiu and Goryeo general Jin Fangqing to lead the army to attack Tamna Island to suppress Lin Yan. After that, the Yuan army set up a recruitment division on Tamna Island, stationed 2,000 troops in the border of the town, thus controlling the sea passage between Japan and the Song Dynasty, so that the Yuan army could attack Japan with all its might. Subsequently, Kublai Khan summoned Xindu, Jin Fangqing and others to Zhongdu to discuss the matter of the conquest of the day. In the first month of the 11th year of the Yuan Dynasty (1274 AD), Kublai Khan ordered the king of Goryeo to build 900 warships, of which 300 large ships could carry 1,000 or 4,000 stones, which were built by Jin Fangqing; The construction of 300 Batulu light boats and 300 water boats was built by Hong Chaqiu, and it was stipulated that the construction would start on the 15th day of the first month and be completed within a time limit.

In June, 900 warships were completed, and Kublai Khan ordered a coalition of Mongol, Han, and Goryeo armies to invade Japan. The core of the coalition army was the Mongol troops, including 20,000 Mongol and Han troops, 5,000 Goryeo troops, and 6,000 Goryeo sailors, a total of more than 30,000 people.