The rear army was responsible for defending both sides of the Nandu River estuary, where complete fortifications were built on the coast, and the first line of defense was a wooden pile buried in the shallow sea, which could prevent the enemy's medium-sized and above warships from rushing to the shore, leaving only the passage for ships to enter and exit unsealed; The second sand bank along the coastline was one zhang high, two zhang wide at the bottom, and one zhang high at the top, reinforced with wooden fences and fences, behind which archers, grenadiers, and small ballistas were arranged to block the onslaught of the enemy cavalry and shoot the enemy landing force that had just rushed to the beachhead. Pen "Fun" Pavilion www.biquge.info

A hundred paces behind the two lines of defense was a trench two feet wide, five feet deep, because it was close to the sea, and the ditch was full of seawater, and even war horses could not cross it. Behind the ditch is a five-foot-high low wall built with the sediment from the trench, which is defended by soldiers, and in the middle of it is to use the reef protruding from the ground or artificially build a high platform to place heavy ballistas, stone throwers, and rocket launchers.

The trebuchet arranged here is by no means a man-towed or counterweight type commonly used in this era, but a torsional stone thrower powered by a noose on the same firing principle as a ballista. But it is also a big man, placed there like a small temple with a flagpole in size, weighing no less than four or five thousand catties, and it is precisely because the weight and volume are too large that they are not suitable for installation on the ship, and it is difficult to move, of course, it can also be miniaturized, but Zhao Yu felt that with the ballista with enough rate of fire and power, he used them as 'city defense artillery'.

The machine was positioned using a roller, and then a support was added to the bottom of the side to adjust the range of the projectile, the end of the arm was held in place by an opening in a large iron hook, and the top of the arm was attached to a grenade belt to place the stone projectile. A stone projectile is placed on the grenade belt, and four soldiers on each side of the trebuchet pull the projectile arm rod down by turning the drum and tightening the noose using a ratchet mechanism until the rod arm is almost level with the ground. When released, a large wooden hammer is used to strike the iron handle to fire it. When the arm is released, it bounces upwards and throws the stone projectile from the grenadier belt.

If the upper end of the rod arm is made into a seat to place the stone bullet, then this end of the rod arm must be made large and heavy, and if it is used to block the bar arm crosswood, it also needs to be reinforced, so that the stone thrower will be more cumbersome, which is not conducive to manufacturing and moving. So he came up with the idea of using a grenade belt, and the length of the belt actually became an extension of the boom, so that it would not bring a significant increase in the weight of the boom.

The lever principle used by the trebuchet, that is to say, the longer the rod arm, the longer the distance to sweep through the air, and the farther the projectile projectile, while the use of the grenadier belt can be made from the thick end to the gradual tapering, the rod arm can be much lighter at the same time, compared to the end of the thick pole arm to place the projectile, the rebound speed is much faster, and the power increase is also surprising, the difference is like the difference between the small slingshot and the large slingshot used by schoolchildren to shoot stones.

Zhao Hao once experimented, although this kind of heavy torsion trebuchet is not as terrifying as the record can throw a horse weighing 500 kilograms into a city of 2 or 300 meters, it is no problem to throw a fat man of 200 kilograms 400 meters away at the limit. If such a large stone hit a warship, even a large warship would be unbearable, and if it hit the top of the ship, he felt that he could smash the ship through it in one fell swoop. If you add three or five pounds of stones and throw them out in the way of scattered flowers, you will definitely be able to flatten a large area, and it is much more economical than rockets......

"Stone thrower, load shotshots, four hundred paces away, target enemy ships on the river, prepare!" The command post of Zhuang Siqi, the commander of the rear army, was set up on a high slope, and the enemy troops who landed on the sea were either sunk or overturned under the bombardment of rockets, but the Batulu ship could carry 50 soldiers, and under their rowing in unison, the warship was already fast, and the speed was faster with the help of the rising tide, and the size of the ship was small, so that half of the ships avoided the bombardment of the rockets. The follow-up enemy ships continued to be used towards the sea, and seeing that the enemy ships rushed up along the sea, he ordered.

"Ready!" After watching the signal sent back by each gun position, Guantong returned the report.

"Launch!" Zhuang Siqi ordered.

Ten stone throwers set up at the coastal mouth of 'Huhu, Huhu...... were launched at the same time, and the stones wrapped in the bullet belt flew into the sea with the sound of the wind drawing a parabola. The mouth of the sea is in the shape of a flare, narrowing as it deepens, and with the addition of hidden piles, the navigable channel is only more than 50 steps wide. Although the accuracy of the catapult is insufficient, it is still more reliable than rockets, and thousands of bowl-sized stones are smashed into this area.

Everyone knows that the potential energy contained in a glass that falls from a height of five or six floors is enough to smash a person and kill him on time. These falling stones from the sky are more than ten times more powerful than a cup, and of course those enemy soldiers are not stupid, seeing that there is an 'air attack', they have raised their shields to block it. But how can these shields made of wood be blocked, they are smashed through and smashed in an instant, but it is better to block them than to hit them directly, although they have some skin trauma, they are not seriously injured. There are unlucky ones, naturally there are even more unlucky ones, and those who are directly hit all have their brains bursting and their bones and tendons broken.

The warship is much larger than the size of the people, and the probability of being hit is naturally higher, and it is okay to smash it in a thick place, and some stones go directly through the gangway, and the people on the ship will suffer, and the small holes can still be blocked, scooping the water out, and the big ones can only swim ashore as ducks. This round of attacks inflicted great casualties on the enemy, and less than ten enemy ships rushed through the two rounds to stop them.

However, the elite is the elite, the Mongol army after decades of conquest, the loss is not small, but they also annexed the surrounding nomadic tribes and many foreign tribes through the conquest, including the northern Han people, in the infantry, cavalry can still maintain more than half, the water army can also account for thirty percent. Therefore, after suffering huge losses, they still desperately rushed to the beachhead, trying to grab a foothold, and even failed to rescue their comrades who fell into the water.

"Heavy ballista ready, flowering shells, target enemy ships two hundred paces away!" Zhuang Siqi looked at the enemy ships that had become sparse on the river and ordered.

Now that His Majesty has wasted rockets, the matter of punishing Liu Wenjun and Zhang Zizhen, the two commanders, for eating a big pot of rice every day has already spread throughout the army, and Zhuang Siqi must of course take this as a warning, so after bombarding the dense enemy landing fleet with rockets, and then using a catapult to attack the enemy ships that have suffered losses, then the rest of them are not suitable for covering a large area to strike, and the ballista is suitable for precise targeting.

"Report, the ballista is ready!"

"Launch!" After receiving the return from Guantong's hand, Zhuang Siqi immediately ordered......

…………

"Your Majesty, this scorpion cannon is really powerful, even more powerful than the bed crossbow that our army used to equip in the past!" Zhang Shijie looked at the messy beach-grabbing enemy army that was smashed by the torsion stone thrower and smiled.

"Scorpion Cannon?! Do you call this kind of stone thrower a scorpion cannon? Zhao Yu was stunned when he heard this, put down the binoculars and turned his face and asked.

"That's right!" Zhang Shijie said, "The soldiers in the army all said that after the stone thrower was launched, the pole arm was like the tail of a scorpion, and the grenade belt was like a hook thorn at the end of the tail, and the stone bullet shot was hugely powerful, and the middle one was all killed at the moment, just like the viciousness of the scorpion, and the minister looked very vivid, did Your Majesty think it was inappropriate?" ”

"No, no, everyone said it very vividly, much better than I thought, let's call it a scorpion cannon in the future!" Zhao Hao waved his hand again and again and smiled.

When he listened to Zhang Shijie's words just now, he really sweated in his palms, when this torsion stone thrower was first invented, the Greek soldiers really called it a scorpion cannon, but as early as BC, it disappeared because of too much secrecy. You must know that there are still many limitations in the communication between the East and the West at this time, but at the moment, someone has called out the 'nickname', can Zhao Yu not be nervous? If anyone knows the secrets of the ballista, they will not have the exclusive possession of these two powerful weapons that can make the difference in the outcome of a war.

"Oh, what does Your Majesty think this stone-throwing machine looks like?" Zhang Shijie was curious and asked the little emperor.

"Hehe, this stone-throwing machine of my sense is like a wild donkey when it loses its temper and kicks the stones on the ground!" Zhao Yu smiled and kicked his legs back twice and said, in fact, this 'wild donkey' is also another name for the Greeks.

"Haha, Your Majesty is really funny!" Seeing His Majesty's clumsy imitation of a donkey's paddle, Zhang Shijie was stunned, and was amused by His Majesty, who was still full of childishness, and laughed.

"Why, don't I learn like you?" Zhao Yu put on a serious look and asked, in fact, the most intimate contact between him and the donkey in his previous life was that the donkey meat was burned, and then he had seen the donkey from the animal world, but the horse was now common. But looking at Zhang Shijie's obscene smile, I was relieved, is there a similarity between the aesthetic views of the East and the West after all, it is purely a coincidence!

"This ...... Although it is not exactly the same, it is also eighty. Zhang Shijie saw that His Majesty was serious, but he was embarrassed, it didn't seem appropriate to say whether it looked like or not, and he held back for a long time and said something ambiguous.

"That's what I remember, I'll let them find a donkey tomorrow to see." Zhao Hao didn't buy it, and pondered for a moment. And secretly happy in his heart, this Zhang Shijie is also an honest person, if he is a sensible person, he will definitely show himself how a donkey is stumbling. If you feel that it hurts, you will praise yourself for learning like this, and you will never be so perfunctory about yourself.

"Your Majesty, I'm afraid it's hard to find donkeys in Qiongzhou, but there are a lot of horses in the army, and they are almost the same when they pick up their feet." Zhang Shijie frowned and said in embarrassment, and gave His Majesty an idea.

"Eh, I don't dare to agree with the cardinal's words, since donkeys and horses are two kinds of beasts, there must be differences, I must look at this Qiongzhou and not find a donkey!" Zhao Yu was about to suffocate his internal injuries when he heard this, why did Zhang Shijie be so funny, and he took his words seriously, and he pretended to be more serious.

"Yes, yes......" Zhang Shijie nodded again and again, secretly complaining in his heart, after all, His Majesty is still a child, what do you call him for the head of the donkey, you have to work hard to find a donkey for him.

'Boom, boom, boom......'

"Your Majesty, the rear army has fired!" Just when Zhang Shijie didn't know how to talk about it that day, the west remembered the sound of explosions one after another, and he secretly recited Amitabha, and the sound of the cannon was considered to have saved his own life.

Zhao Yu followed the sound of the explosion, and saw that the remaining enemy ships were turned into broken wood and rotten boards under a fierce ballista fire, and some of them could still move, tearing off the heavy armor on their bodies and fluttering, or using the wooden shield as a lifebuoy to lie on it, but the dead and not dead were all pushed by the tide and rushed to the shore involuntarily. These living people gradually gathered together, and under the arrows of the Song army like locusts, they rushed ashore at a small river bay and lay down in the depression.

"Are they feints?" Zhao Hao estimated that there were about 100 enemy soldiers who came ashore, and they lost their armor, and some of them even sank their weapons into the river. And with no support ships to follow, what can they do with their men!

"Your Majesty, they should be a feint, testing the reality of our army, and preparing for the next attack!" Zhang Shijie replied.

"I wondered, this river has a narrow waterway, and it is not a place for soldiers, so why didn't they land from the coast?" Zhao Yu said that the first round of the enemy's attack just now sent out thirty Batulu warships, which was enough for a thousand people, and the river was narrow and the impact surface was limited, and it was easy to be attacked by the opponent's concentrated firepower from three sides, no matter how he looked at it, he had no chance of winning, which made him very incomprehensible why he had to waste his troops so much.

"Your Majesty, the minister thinks that Ali Hague has probably seen through our plan, and he must be worried about the interception of our naval army, so he wants to land as soon as possible to gain a foothold, otherwise the loss will be even greater." Zhang Shijie analyzed, "From the south of the river can go straight to Fucheng, he thought that as long as we could land here and control the estuary, our coastal defense line would all collapse, so we could only abandon Fucheng and retreat south." However, from the perspective of the ministers, their enemy soldiers should be in a hurry, and the two sides did not cooperate well, otherwise they could attack Haitian Island in two ways, and if they control this place, they can also reach their goal! ”

"Well, the cardinal has analyzed it well, I'm afraid that the attack will start over there!" Zhao Yu pointed in the direction of Baisha Island. He knew that his 'anti-intrigue plan' could only be concealed for a while, and it was not difficult to see through Ali Hague's head after discovering the instigation of the capital, but he still believed that most of the Qiongzhou naval army went to pursue the instigation capital. And now that the strategic intention has been exposed, if it returns to the sea, there will be no chance, and it may be pursued by himself, so as Zhang Shijie said, he launched a desperate attack.

"Alas, Liu Quan's surrender to the enemy has been harming for a hundred years!" Zhang Shijie also turned to Baisha Island to take a look.

"What do you mean by that?" Zhao Yu knew that Liu Chuan helped Kublai Khan establish a naval army, so that the Yuan army was able to break through the Huai River and the Yangtze River, pacify the south of the Yangtze River, and kill the Great Song Dynasty, but this person who has been dead for many years has a relationship with the current war situation......