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This is actually one of the secret skills of the military state, but unfortunately ordinary people can't learn it at all, because it requires a lot of mathematical knowledge, and because it involves calculations, only a few people can learn to use it. In fact, this is the application of the mature ballistics theory.

Du Haiwa while operating the calculation, while reporting the numbers loudly in his mouth, the commander of the eight catapults on the Wanshi boat next to him, skillfully commanding the soldiers to control the catapults, according to Du Haiwa's estimated distance to adjust, the soldier with a loud voice next to Du Haiwa calculated the results to the ship next to him, although the more to the side, the distance is not the same as the Wanshi ship, the error will also increase, but after calculation is better than blind typing.

Soon, the second wave of calculated catapult ejections were prepared, and they were launched one after another, and a catapult next to Wang Junlin flew out of a stone bullet with a roar, and luckily smashed it in a group of Goguryeo troops running around, Wang Junlin held a handful of Nie Xiaoyu made out of the telescope and saw blood splashing, and greatly praised Du Haiwa a few words.

Du Haiwa was humble again and again, claiming that Lord Kraken had taught her well, and the pirates who had survived on Snake Island at the earliest had stubbornly called Nie Xiaoyu a Kraken.

After throwing four waves in succession, killing more than 200 Goguryeos, all the Goguryeo people ran out of the attack range, but Wang Junlin still ordered to continue the projectile, but the pace was not as fast as before, but the purpose was to scare the Goguryeo people from approaching the coast.

Yuangai Suwen stood on a small hill, looking gloomy at the morale of the mountain and the morale of the mountain dropped a lot, and the more than 10,000 people who started the whole team again, thinking that they must achieve a victory, even if it is a small victory, otherwise even if their strength is three times that of the other party, their morale will be worn out.

Yuangai Suwen first calmed himself down, and the situation at this time required him to calm down in order to stabilize the people below.

At this time, he saw that the more than fifty large ships on the sea, each with a small boat, each with a dozen or so people on board, were rapidly approaching their warship on the shore.

"It's not good, hurry back and protect the ships, our food and ordnance haven't been taken down yet." Yuangai Suwen shouted loudly, his order was passed down by the people below, and many generals organized soldiers to run back, but with the waves of stone bullets just now, and now the stone bullet shooting is still not over, the Goguryeo soldiers lingered and did not dare to step forward.

By the time Yuan Gai Suwen sent his own soldiers, ordered a wave of men to be slaughtered, and drove the soldiers forward, it was too late, and fifty ships loaded with food and ordnance were pulled away, and the rest were set on fire.

Except for those who had already unloaded the ship before, and desperately grabbed some of them at this time, less than a quarter of the grain and ordnance brought by the Goguryeo people actually landed.

Cui Shengjun said indignantly behind his back: "These Sui people don't have the courage to go ashore, they only dare to throw stones from afar, and they are all rats." ”

Yuangai Suwen took a closer look at the shore and said: "Actually, the killing of this trebuchet is not as good as a bow and arrow, but the soldiers below are all scared, you take a closer look, they have thrown so many people, only a few people have been killed, but only two or three hundred people." ”

Cui Shengjun also probed out to see, just in time to see two stone bullets smashed into a clearing, one smashed a stone, the other jumped a few times, brought up a few clouds of smoke and dust and stopped, the nearest armor soldier was also dozens of steps away, although the momentum was amazing, but it really didn't hit anyone, there were some corpses near the shore, and the number was not much.

He said to Yuan Gai Suwen: "It's true that I didn't kill a few, but as soon as this stone bullet hits, a few layers of armor are useless, and the corpse can't be found, so no one is afraid." Now that the ship has burned, we only have a few days of food on the island, and it seems that we must fight quickly and capture the walled city on Bailing Island as soon as possible. ”

"Send the order down, there is no need to set up camp, just take all the food and ordnance, go to the walled city, and prepare to attack the city." Yuan Gai Suwen ordered in a deep voice.

However, when the Goguryeo people came to the walled city of Bailingcheng, they found that compared with the original, not only the scale of the walled city and the height of the city wall were several times that of the original prison city, but also the surrounding walled city had completely changed in all directions, and the walled city was surrounded by three moats, the first two were slightly smaller, but the depth and width were not enough.

After two layers, there is the main moat with a depth and width of more than one zhang, and the soil dug out of the trench is built behind the main moat, and the height of the battlement on the walled city reaches more than three zhang.

Seeing this, Yuangai Suwen's face changed, and he thought to himself: "How many lives do you need to fill in this before you can attack the main city." ”

Yuangai Suwen looked at the strong barrier in front of him for a long time, and all the generals were by his side, all of them had solemn expressions, they never thought that there would be such three trenches outside the small walled city they were going to attack.

The three trench positions are not city walls, but the role is no different from the city wall, the earthen wall is about one zhang five feet high, but there are seven or eight feet of deep trenches below, which is equivalent to two zhang of the city wall, after these three roads, it is the walled city, there is still a complete defense system, although the details inside are not clear, but the defense line in front of them is completely different from their understanding, they never thought that the city can be guarded like this.

Yuangai Suwen asked Cui Shengjun in a deep voice, "What is the situation in the place where you enter the port?" ”

"There is also a huge trench at the entrance to the port, and there are several layers of earth walls in front of the trench, one south and one north, guarding the waterway, and the terrain is narrow, and the attack needs to climb over several layers of earth walls, and our army will also be attacked by the enemy's sea throwing rocks in the past."

An infantry general next to him has been on fire since the start of the war, and sneered at this time: "According to the virtue of the Sui people, especially that Wang Junlin heard that in the Great Sui is good at killing people by various means on the battlefield, there may be any famous names in those ditches, and all I can think of are ghost arrows, iron thistles, horse traps, sharp wooden stakes, ground crossbows, and so on." And they also have stone-throwing vehicles and long-range crossbows at the head of the city, open the gap and lay them flat, only a few horse blocking ditches are dozens of steps wide, all within the shooting range of their stone-throwing vehicles and strong crossbows, the shield vehicles cannot be close, and thousands of people will die when filling the trenches. ”

Yuangai Suwen's eyes changed, and the defense line of the walled city of Bailing Island in front of him was like a silent monster, which was wearing down his strong will. He finally couldn't help but scold: "Wang Junlin is a dog thief, and he is really the most sinister person in the world. ”

Another general said with some fear: "I heard that Wang Junlin once burned tens of thousands of Turks to death in the northwest of the Great Sui, and poisoned a city of Turks with a barrel of poison, but I really don't know what evil things are waiting for us in that trench......