"Zheng Yi, how far is it from Guangzhou?" After dark, the fleet berthed on an unnamed island at night, and after a simple dinner, Zhao Yu called Zheng Yi and asked.

"Your Highness, there is still about two watches to go." Zheng Yi took out the booklet and flipped through it, and replied.

"Well, our journey down will be smooth, and there should be time before we go." Zhao Yu said with a calculation, he knew that in ancient times, because of the underdevelopment of science and technology, there were still limitations in his understanding of geography, and it was difficult to have a reference on the vast sea. Therefore, it is difficult to calculate the voyage, so the time is calculated by burning incense or hourglass, and the day and night are divided into ten watches, so the mileage is calculated by the watch. Therefore, it is not only the unit of time, but also the mileage traveled, which in this case is about sixty miles per shift.

"Yes, Your Highness, I will go to sea tonight, and I will be able to reach Haikou before dawn tomorrow." Zheng Yi said with certainty.

"Zheng Yi, can you lend your booklet to this king to read?" Zhao Yu pointed to the booklet in Zheng Yi's hand and said. Primary school students in previous lives knew that speed multiplied by time is the distance, and when the ship sails on the sea, the wind and tide are good and bad, and the driving speed is slow, and these uncertain factors often make the voyage difficult to calculate. The ancients did not have modern advanced instruments, but they could use the wood throwing method to measure the speed of the ship, roughly calculate the relatively accurate voyage with the time taken to burn incense, and make nautical charts and thinner roads with needle paths, etc., and the booklet in Zheng Yi's hand, Zhao Yu, concluded that it was a nautical chart.

"Your Highness, this ......" Zheng Yi hesitated and said, "Your Highness, can you show your subordinates the clairvoyance of the white sun?" ”

"Hehe, I still talk to this king about the conditions, okay. This king will promise you! Zhao Yu understood after a little thought, and handed the telescope to Zheng Yi, and Zheng Yi immediately presented the sea chart that was as precious as life. The two of them immediately took their own hands and played with them.

"Your Highness can read it?" Zheng Yi looked at the distance and looked close, his eyes were dizzy, he rubbed his eyes and looked up, and suddenly found that the little prince was flipping through the booklet and recording with a pen, as if he was calculating something.

"Is this hard?" Zhao Hao asked with a wink and a smile. He knew that it was precisely because of the uncertainty of the sea state that there were two prerequisites for calculating the range in ancient times: first, speed measurement; The second is to have people who know how to slow down the wind and the flow of water. However, it is precisely because of the human factor that makes each chart different. Formed their own secret book.

This also led Zheng Yi to think that the little prince didn't understand this knowledge, and even if he showed it to him, he couldn't understand the mysteries, but he couldn't imagine that there was an expert hidden in it. Zhao Hao only needs to determine the time of burning the incense he uses, the flow of water and the direction of the wind. It was only a matter of minutes to crack his chart, and it was only the 'inexplicable' place names in the map that bothered him.

"That'...... Then I won't change it! Zheng Yi suddenly stretched out his hand and wanted to grab it, but Ni Liang, who looked at the side, retracted his hand again, he was really afraid of this stupid boy. Who in the guards would dare to say that His Highness is not good at all. He will immediately turn his face, let alone snatch something from His Highness. But he really didn't want to lose the hard work of several generations because he was greedy for playthings, and he also knew that this was the capital he could stand in the army.

"This king will not take the love of others, give it to you!" Zhao Yu smiled and returned the booklet to Zheng Yi, in fact, Zhao Yu learned in his previous life to involve this aspect of things, but he has never seen the real thing, and now he knows the principle at a glance, and he can use it as a sample. Combined with existing tools to make more accurate and standardized charts, so it doesn't make sense for him to come to this chart now. It's just that I can't take care of it for the time being, and I have to rely on this old thing.

"This ......" The prince easily agreed to his request, but Zheng Yi hesitated and was stunned.

"Okay, the clairvoyant mirror is more useful in your hands, you use it first, but don't damage it, this is unique in the world." Zhao Yu stuffed the booklet to Zheng Yi, who looked embarrassed, turned around and said, "Wang De, please ask a few senators and generals to deliberate, and the fleet is ready to go!" ”……

…………

On the 10th day of the first month of April, the fleet of Shuaifu, which had been sailing southwest, suddenly turned southeast and entered the Lingding Ocean, and the fleet sailed into the mouth of the Pearl River at the beginning of the year. Due to the thousands of years of erosion and sediment accumulation of the Pearl River, many sandbanks and shallow bays have been formed here. Due to the cramped river and the large number of reefs, in order to avoid the stranding, the fleet turned into a tandem column, widened the distance, lowered the half-sail and slowed down, and more than 200 ships were like a long winding dragon.

The fleet marched to Longwan, and the front army continued to advance and prepare to pass through the water pass and approach the city; The right army hid behind a sandbar to the east, and after the front army launched an attack, it entered the east water trench from the Pipa Chau waterway to capture the right wing city; The left army cooperated with Jiang Xuan's commander and brave camera to capture the two towns of Fuxu and Shimen, waiting for an opportunity to capture the left wing city. After the Chinese army seized the port, they cooperated with them to annihilate the Red Horse Exploration Army stationed outside the city; The rear army was tasked with protecting the king's chariot and keeping the waterways open, and at the same time served as a reserve force ready to support the armies.

Zhao Hao's boat was moored in the center of the river, in order to prevent him from running out again to 'watch the excitement', Ying Jie strictly ordered him not to leave the cabin, and he also knew that Wang De and Ni Liang alone could not look down on the prince, and if he didn't get it, he would have to be fooled out by His Royal Highness, and maybe he would have to run to the front to join in the fun. As for the several adults on the ship, Zhao Mengjin was sent to the front army to directly command the battle, and Pan Fang, the deputy envoy of the transfer, supervised the battle in the rear army, and promoted Gao Yingsong to the right army to supervise the battle, leaving only Ying Jieyan to sit in the middle army. Therefore, Deng Guangjian and Yuan Miao can only be allowed to 'accompany' each other in the cabin.

At the moment, one of these two people was sitting at the door of the cabin with Buddhist beads and closing his eyes and reciting the scriptures, but the other did not force him to endorse the book, holding the book alone in front of the candle and shaking his head. Looking at these two stuffy gourds, and they were his own masters, Zhao Yu couldn't talk if he wanted to. Because of the implementation of the light control, the lights were turned off outside the cabins, and he did not dare to open the windows, so he could only open the portholes through a narrow slit and look out.

At this moment, the half-curved moon has tilted to the west, and the stars in the sky reflect the stars on the surface of the sea, twinkling with the waves. Dogs barked occasionally on the sandbanks on both sides, but there was not a single light in sight, and I don't know if I was accustomed to the night mooring of boats, or if I was still asleep, and I couldn't even see a single figure. And the sound of the boat breaking the water is very abrupt in the silent night, which makes people can't help but be frightened.

"Your Highness, the tide is starting to rise!" Zhang Jin walked into the cabin and said.

"Hmm." Zhao Hao snorted and knew it, and he didn't ask much and still looked out the window, but his heart hung up, today is the seventh day of the new year, not a big tide day, and it is not conducive to the fleet to take advantage of the situation. However, because the information received showed that the enemy brigade had begun to withdraw, only the rear army in charge of the baggage was still in the city to raise food and set off. If they waited, the city of Guangzhou would have been looted, and they would have lost their original intention to attack the city, so they could only start in advance.

According to the agreed battle plan, the Marshal's army was ready to launch a campaign on the tenth day of the first month. The fleet entered the sea mouth under the cover of night, and approaching the city would inevitably pass through the water pass, and they planned to use a sneak attack to seize the pass. But this water pass is set up with a city wall, and there are also naval armies, and it is very difficult to get close, and it is not easy to succeed by secret attack. Therefore, they decided that if they could not succeed in the cover, they were ready to take advantage of the rising tide to take advantage of the tide to break through the water gate with a big ship, and then divide their troops to seize various ports and land. There were obviously major flaws in this plan, and once a strong attack was adopted, it would inevitably alarm the Tanma Red Army stationed outside the city.

According to the Mongol military system, soldiers were selected from thousands of households, hundreds of households, and ethnic tribes in every major battle to form elite troops and act as vanguards in field battles and sieges of castles. Unlike the Mongol army, which consisted of thousands of soldiers, it was composed of a mixture of soldiers selected from various divisions, and after the war ended, this army was stationed in the conquered areas, known as the Tanma Red Army. Therefore, they can be said to be warriors who can be ten out of a hundred, several times stronger than the new annex army composed of the Song Dynasty's surrendered army that stayed here, and it is the biggest enemy that the Shuaifu army has to face.

The Shuaifu army has a few catties and a few taels Zhao Yu knows best, if it is on the water, it may have the strength to fight, but it is really difficult to say that it can retreat against the Tanma Red Army on land. This is not that he is arrogant, the Battle of Quanzhou Song army was about to capture Quanzhou, instigated the capital to bring only 3,000 horses to help defeat hundreds of thousands of Song troops, and finally relied on the desperate cover of righteousness and courage to get out. Therefore, after killing Zhao Hao, he also did not believe that the Shuaifu army, which had only undergone two months of training, could defeat the Mongolian Tanma Red Army in a small universe.

Of course, Zhao Yu is not crazy yet, knowing that it is a wall and still hitting it. His plan was to quickly use rockets to bomb the camp of the Red Horse Exploration Army after entering the water pass, without any intention of going up to them in hand-to-hand combat. In his estimation, a 'meteor shower' would scare the Tartars if they didn't kill them all, after all, this thing was the first time it had appeared, and it was inevitable that it would cause panic and chaos. Then he sent his infantry to take advantage of the opportunity to land and win in the chaos, and he himself was very skilled in this trick of fishing in troubled waters.

However, considering that the accuracy of the rocket is 'slightly poor', it is not yet possible to point where to hit, of course, the more concentrated the enemy army, the better the effect, if it is dispersed out of the barracks, the effect will inevitably be greatly reduced. Even if he can snipe accurately, he is reluctant to use a rocket to destroy an enemy, this time it is indeed not out of cost considerations, but the craftsman bureau has done its best to only create more than 200, and he does not dare to guarantee that all of them can sound, so whether the sneak attack on the water pass can succeed is related to the victory or defeat of the first battle, and then affects the course of the entire campaign.

As you can see from the plan, this is the unpalatable rice in the pot. Once the Red Horse Exploration Army was alarmed, the rocket attack was not effective, and Zhao Yu could only order the withdrawal of troops and return empty-handed, or attack at any cost, exchanging human lives for victory. But after the patrol ship led by Pei Jing was captured, Zhao Yu saw the Guangzhou gate open to him again, so he even coaxed and scared him to promise to open the water pass by fraud, so that the bloodless soldiers could come to the city and calmly fire at the Tartar who was still asleep.

But Zhao Yu knows the truth that you can't put all your eggs in one basket. The battlefield is changing rapidly, only what you can't think of, there is nothing you expected, in case Pei Jing rebels again, or is peeped through by the defenders, then the plan of forcibly rushing through the pass with a warship is still adopted. And when the tide begins to rise, it is the time for the action to begin, and the war is already on the verge of breaking out...... (To be continued.) )