Po Slip ordered the entire army of the left column to retreat, all the way to Hanoi. The middle column could not wait for the order of Bo Slip's next move, so it waited in vain in the empty Huai Duc Mansion until the morning of August 16, and felt that it was too boring to hold on like this, and the middle column withdrew from Huai Duc Mansion and prepared to go to the surrounding villages to fight soy sauce, just as the order of Bo Slip to withdraw from the battle and retreat to Hanoi was delivered, so the order was ordered to withdraw to Hanoi. The most unfortunate of all was the right column, which also had nothing to do all day on the 16th, also because it had no further instructions from the waves. It wasn't until 9 p.m. that the water level of the Red River suddenly swelled, and the flood turned the Temple of the Four Pillars into a flood, and the poor right column, from the commander Colonel Bishuo to the small soldiers, were trapped in the flood and embarrassed. It was not until 1:30 a.m. on August 17 that the retreat order of the Wave Slip was finally obtained, and the muddy right column boarded the ship with the assistance of the Tokyo detachment and withdrew from the Four Pillars Temple, becoming the first to exchange fire with the Black Flag Army and the last to withdraw from the battlefield. In the end, 12 French troops were killed, and more than 300 Black Flag troops were killed.

With the retreat of the French, Liu Renyi took advantage of the situation to recover Huaide Mansion, but because of the flood that almost wiped out the French army on the right, he rushed to Huaide Mansion in the early morning of the 17th, completely destroying the camp and fortifications of the Black Flag Army in Huaide Mansion.

Looking at Huaide, who could no longer defend it, Liu Renyi led his troops to abandon Huaide Mansion and retreat to Danfeng further north. The purpose of the Wave Slippery War of Wyed, the expulsion of the Black Flag Army, was actually achieved by the power of nature.

After the Battle of Wyder, the French side analyzed and reviewed, although the final goal of the war was basically achieved, and the casualties of the French army were far lower than those of the Black Flag Army, most of the officers who participated in the war still regarded it as a humiliating defeat. The reason for this is, first of all, the excessive arrogance of General Wave Slip. After capturing Huaide Mansion, he was so greedy that he easily fell into the trap of the Black Flag Army. What is even more unforgivable is that as the supreme commander, he took the lead in fleeing after the middle ambush, ignoring the middle and right columns, and did not give the order for the whole army to retreat until he ran back to Hanoi, causing the right column to almost die in the flood. Then there was the single-celled head commander of the middle column, Major Corona. In the face of the request for reinforcements of the left column that was fighting fiercely with the Black Flag Army, it was indifferent to "have nothing to do with itself and hang high", and lost a great opportunity to attack the Black Flag Army on both sides, and the difference in cooperation between the French troops on several lines showed the problem.

In the end, after some self-examination, the French learned two main lessons: in view of the extremely professionally built fortifications of the Black Flag Army, it was necessary to avoid going head-to-head with the defenders with strong defensive positions. Because of the tremendous role played by intensive fire support in disintegrating and disrupting the Black Flag Army, it is necessary to continue to strengthen fire support during the attack.

The battle of Wyd made the once invincible wave slip lose face, and the dignified European first-class army power faced a group of bandit forces and relied on the power of nature to expel it, obviously with a disgraced face.

See the wave slip in Wyde and return home. The gloating Ho Lo Ho thought it was time for him to slip the tide, and by this time he had a plan in mind – to land in Halong Bay and attack Hue, the capital of the Nguyen court in Vietnam.

Ho Lo Chai's plan was bold and direct, he wanted to leave aside the Black Flag Army entrenched in northern Vietnam and make a fuss directly at the head of the Vietnamese government. An ultimatum was used to coerce the Vietnamese government into expelling the Black Flag Army and recognizing France as its protectorate. If the Vietnamese government agrees to do so, it will save a lot of trouble; If the Vietnamese government does not comply, it will simply capture its capital, Hue, and force the Vietnamese government to submit by force.

After Ho presented his idea as a top-secret plan to the French Navy and the Colonial Ministry. The feedback is to be cautious. Because Hue is located in the bee-waist-shaped part of the Vietnamese territory, it is not a small land distance from Cochinchina, where the French garrison is located, Hanoi, Haiphong and other places. The most suitable way to attack is to land on the sea. But a naval attack required a thorough field survey before it could be decided, and the task of this maritime survey fell to Rear Admiral Lisby.

At the end of July 9083, most of the capital ships of the Far Eastern Fleet were concentrated in Ha Long Bay off the coast of Hue. On the flagship "Baya", Lisby carefully surveyed the topography of Halong Bay, and after obtaining data such as water depth and current. Completely agree with Ho Lo Ho's plan to attack Hue. After receiving Lisby's report, the Navy and the Colonial Department finally approved Ho's plan, but specifically stressed to Lisby: If you act, you must win and not lose, so as not to create a passive situation.

After field reconnaissance. Risby believed that in order to attack Hue, it was necessary to first take the fortress of Thuan An, the gateway to Hue, and the importance of the Vietnamese imperial court was self-evident as the last barrier of Hue City, which was built on the basis of the atolls naturally formed at the mouth of the Hue River. At this time, the Vietnamese government had no spare strength to strengthen the garrison of this life-and-death fortress for them, because their meager energy was exhausted in a palace coup, and the Vietnamese officers and soldiers guarding Thuan An Fortress were left alone from the moment they faced the French.

At the beginning of July 9083, the Vietnamese heir Duc Emperor Nguyen Phuc died of illness, and it was supposed to be the heir to the throne of the crown prince Nguyen Anh Chen, but the ministers Nguyen Van Xiang and the royal family said that because of the gap with the prince, they launched a palace coup d'état during the state funeral, and asked the empress dowager to abolish the heir on the grounds that the prince was too young to govern, and set up the uncle of the prince next to the royal family surnamed Nguyen, and Nguyen Hong Ng, the prince of Lang Quo, as the emperor, called Emperor Shaozhi. The government fell into the hands of Nguyen Van Xiang and Zun Muo. These powerful ministers, who belong to the "internal fighting and outsiders", have some ways to carry out a coup d'état, but they have no idea at all when the country really encounters a real threat. Faced with the Far East Fleet of the French Navy, which had been gathering in the waters off Hue since August 18, 9083, these ministers collectively fell into a state of six gods and no masters, like ants on a hot pot in a hurry, but unable to come up with any good countermeasures.

At 2:40 p.m. on August 90, the ships of the Far East Fleet sailed into their respective positions and lowered anchor. All the warships were lined up and aimed at the battery fortifications with the starboard side. The flagship "Baya", which had the most ferocious firepower, aimed at the central main battery group of the Thuan An Fortress; The second-class cruiser "Fort Reynolds" and the armored cruiser "Adalander" guarded the flagships on the left and right, and the muzzles were facing the two large batteries located north and south of the main battery group; The transport ship "Drac" was aimed at the auxiliary small battery of the Thuan An Fortress; The gunboats "Wildcat" and "Viper" simply approached the shore by taking advantage of the shallow draft.

In the face of the menacing French, the Vietnamese court still wanted to talk to the French. At 3:30 p.m., the Vietnamese envoy boarded the deck of the "Baya" to meet Lisby and beg for consultative negotiations. But Lisby did not give them a chance to speak, but only conveyed a message to the Vietnamese that there was only one way out of the shelling, and that was to accept the French as a protectorate of Vietnam. Then he unceremoniously issued an eviction order and drove the stunned Vietnamese envoy off the ship.

5:40 a.m. Lisby, who did not wait for the Vietnamese to reply, tacitly acquiesced that the Vietnamese had rejected his ultimatum. Therefore, as soon as the flag on the signal line of the flagship "Baya" came out, the French tricolor flag of large size was raised on the mast of the French ships in Halong Bay, indicating the start of the war. The 240-mm guns on the "Baya" began to roar, and the rest of the ships opened fire. In an instant, accompanied by the rumbling sound of cannons, the cannonballs dragged the parabola through the tranquility of Halong Bay, and the forts of Thuan An Fortress were instantly surrounded by thick smoke and water columns. However, what Lisby did not expect was that 15 minutes after the French opened fire, the Vietnamese defenders of Thuan An Fortress began to return fire under the command of the defenders Le Shih, Le Zhun, Lam Hong and Nguyen Trung. Because the berthing position of the French ship is close to the battery. So the old artillery of the Vietnamese quickly also made hits.

The first to suffer was the gunboat "Viper", which was almost surrounded by a column of water stirred up by the Vietnamese shells, and the support rope was ravaged by the whistling shells. Soon, even the Baya, which was commanded by Lisby himself, was threatened by shells. But by about 7 p.m., the gun emplacements of the Thuan An fortress were basically dumb.

On 19 August, Richby's landing party began assembling aboard the transport ship Annamite, but at 3.30 a.m. the officers sent by Richsby to survey the hydrography sent back a dismal report that the tides of the day were not suitable for landing. Lisby was forced to decide to cancel the landing for the day. Instead, he led the fleet to continue shelling the fortifications of the Thuan An Fortress.

At this time, the fortress of Shun'an had lost the ability to fight back, and the bombardment of the French ships continued all morning. In the battle on the 18th, the "Fort Renault," which had lost a 140-mm naval gun due to the bombing, and the "Drac," which had planned to dismantle a 140-mm gun for the "Fort Renault," withdrew from the queue and ran to Da Nang to complete the dismantling, connecting and refitting of the guns, and the "Fort Renault" returned to the team on the evening of the 19th, while the "Drac", which had lost one gun, returned in the early morning of the 20th.

The tidal and hydrological report of 20 August finally showed that it was suitable for landfall, and there was no chance to miss it, starting at 2 a.m. Risby ordered the landing party gathered on the "Annamite" early to begin the transfer of landing sampans. A group of landing sailors wearing red pompom caps streamed from the deck of the "Annamite" to the sampan by rope ladder or rope, and then calmly waited for the commander's landing order.

At 5:30 a.m., the flagship of the Far Eastern Fleet, Baya, gave the signal to attack, and the last fire preparations of the ships before landing on the Thuan An fortress began. To the great surprise of the French, the Vietnamese repaired part of the artillery. Shooting at the French ships began again, and the French, caught off guard, suffered again, and the officer's cabin of the "Baya" was damaged by a shell fired by a Vietnamese gunner, but not seriously. Soon, the last resistance of the Vietnamese was suppressed. At 5:40 a.m., the sampans loaded with the landing party began to row towards Thuan An Island, and the Vietnamese troops defending the island held out until 3:30 p.m., and finally the whole army was annihilated, and several defenders were all martyred, and more than 700 soldiers were killed in battle, and all the rest were wounded. The losses inflicted on the French by this lone army, which had fulfilled its duty to defend the territory against the enemy, were 62 killed and 147 wounded, of which 39 were killed and 68 wounded by Vietnamese mercenaries.

Although the Vietnamese court tended to be weak and compromise in the face of French pressure step by step, the resolute resistance of Thuan An Fortress added a special bright color to the course of the Vietnamese official army's resistance to France, and such resolute resistance is one of the few in the history of Vietnam.

Thuan An's resolute resistance only delayed the final moments of the Vietnamese court by two or three days. Today, the Thuan An battery is at the foot of the battery, the capital of the Vietnamese city of Hue is under the guns of the Far East Fleet**, and the Vietnamese are completely in a desperate situation.

Ho Lo Chi, who was watching the battle from the flagship "Baya", was so proud that he and Lisby entered Hue with a group of soldiers, and handed over a "peace treaty" in front of the frightened Vietnamese monarchs. The content was 27 harsh conditions, including the recognition of France as a protectorate of Vietnam, the cession of Binh Thuan Province, the withdrawal of all Vietnamese troops stationed near Hanoi, and the recognition that France could permanently station troops in Thuan An and other places in Vietnam. At this time, He Luozhen put on the winner's shelf: "I give you forty-eight hours to consider whether to accept or reject the conditions I have put forward to you in their entirety, and there is no room for discussion...... If you refuse, it will be a great disaster. You should envisage all the terrible consequences. But you are still ignoring the reality: the Kingdom of Vietnam, its monarch and the imperial court will pronounce death on you, and the name Vietnam will disappear from history! ”

Faced with such a desperate situation, the Vietnamese court had no choice but to choose the extremely humiliating path of accepting the peace treaty. On August 25, 9083, after the expiration of the 48-hour ultimatum proposed by Ho Lo Ho, the Vietnamese co-organizer Tran Dinh Su and the merchant minister Nguyen Trong Ho signed the Treaty of Hue on behalf of the King of Vietnam.

At this time, He Luozhen thought that he had successfully solved the long-delayed Vietnam issue, and his mind appeared from time to time with flowers, cheering crowds and medals, but he did not think about it. He will meet a man who will make all this for naught, and he will be greeted only with humiliation and imprisonment.

Although Vietnam was officially "independent" and got rid of the status of a vassal state of the Qianguo, it became a French protectorate. Although the obligation to the "Celestial Empire" had ended in the sense of international law, Emperor Shaozhi nevertheless sent a submission to Beijing. Regarded as fulfilling the last obligations of the former subject state:

"On 16 July, there were eight French warships. Suddenly, Shun'anxun, the capital of the lower country, sent an official to answer the call on the boat, and replied that there was only a war ear. Immediately opened artillery fire, and the national strength refused to wait for help, and the experience was full of emotion. On the 17th and 18th, he attacked and pressed for days, and shot through the fortresses. Most of the officers and soldiers of the lower country were wounded and killed, and the Zhutun along the flood was all based, and the situation was extremely dangerous, and the lower country retreated to the river to defend the Zhutun. It is suitable for the eighteenth night, and he received the letter of the French minister He Luo to negotiate peace. Most of the terms are difficult to follow. The first brother of the lower kingdom was at the funeral, and the queen mother was sick and grieving, and suddenly encountered this change, so she had to save the power, so she sent Chen Tingsu, the minister of the Ministry of Rites, and Ruan Zhong, the minister of the Ministry of Rites, to extend the envoy to negotiate the 27th paragraph of the treaty with the embassy. The lower country has been under the feudal domain for a long time, and as a last resort, dare to use the reason to report ......"

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