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Five trebuchets were erected outside Xiangyang City, and Liu Biao on the city tower watched Zhou Yu only assemble five trebuchets, and couldn't help but breathe a sigh of relief in their hearts, it seems that Zhou Yu is not as powerful as he imagined. Depending on the size of the trebuchet, it is estimated that the stones will fall before they reach the walls. The effective range of a large trebuchet is between 200 and 300 paces, and that of a small trebuchet is between 150 and 200 paces.

The trebuchet uses the principle of leverage, one end is loaded with a heavy object, and the other end is equipped with a stone bullet 5261 to be launched before the launch of the ammunition must be placed at one end with a winch, pulley or directly pulled down by manpower, and the other end with the heavy object also rises at this time, after the stone bullet is put away or cut the rope, let one end of the heavy object fall, the stone projectile is also thrown out of the trend, it is said that this trebuchet is the first person to teach people to introduce the Central Plains, and there is a common name called this called "return cannon".

The five trebuchets of the Yangzhou army looked like small trebuchets, and the range of this trebuchet was 150 steps to 200 units, but the Yangzhou army placed the trebuchet 300 steps away, and the personnel they operated the trebuchet did not see so much.

"Generals, how is the attack power of this trebuchet of the Yangzhou Army?" Liu Biao looked a layman when he asked these words, and the opponent wanted to know how the attack power was before he made a move? Thinking that they are all immortals or gods, what kind of war will they fight if they can pinch and calculate, it is better to find a piece of white cloth with the words "Divine machine noodles are counted as half-immortals", and a table, pen, ink, paper, and inkstone can be started together. The Central Plains of the Han Dynasty rarely attacked fortified positions, and Jingzhou was negligent in battle for a long time, even Zhang Ren and Ji Ling could not figure out the intentions of the Yangzhou army.

"Lord - this kind of small trebuchet can only be thrown at the root of the city wall, and our Han standard trebuchet is at such a distance. The last general was stupid and couldn't see what the Yangzhou army's next intention was? Five trebuchets can't do substantial damage to our walls. The city wall of Xiangyang is about three zhang high, and the city wall is thick enough, but these five trebuchets can't hurt our fur when they attack day and night. Wen Ping explained to Liu Biao according to what he knew, and the generals around him also nodded.

"Okay - then let's do a good job of city defense first, and then discuss how to repel the Yangzhou army." Liu Biao finally breathed a sigh of relief, and his tightly knit brows finally relaxed a lot.

Just as they were about to descend the tower, suddenly there was a bang on the city's head, and a huge rock fell on the city's head. The war drums standing on the head of the city were smashed one by one stone, and the group of people who were about to go down to the city tower were blindfolded with one stone.

"Hey-the people on the city tower listened to this cannon just now, it's a try, if you want to survive, it's best to roll down the city wall and don't show your head, otherwise you won't be smashed and die!" After Zhou Yu's five trebuchets were erected, he began to do a test shot, but he didn't know that the winch was a little tight, and a stone flew up the city wall to make such a big noise. If it weren't for Liu Biao and them going fast, it is estimated that their heads would have blossomed-

"Haha-Liu Biao Lao'er is a turtle with a shrunken head, it is said that he is still a big turtle with a little green head, he has long shrunk in his turtle shell, and those people on it are poor cannon fodder. The weather here in Xiangyang is not bad, and the wind and sun are just right for Liu Biao Lao'er to go back to accompany his little lady. Brothers, hurry up and go home, otherwise they will be sent to the west in the future, your wife is someone else's, and the child should be called someone else's father. Drop your weapons and surrender! ”

"Yes - the brothers in the city also know how good the lives of the common people on the border of our Yangzhou military territory are, what kind of conscription tax is the lightest, and the soldiers who surrendered to join the Yangzhou army are exempted from all taxes. Selling life to Liu Biao Lao'er is three melons and two dates, which is not enough to buy wine and drink! ”

"After this battle, it's enough for us to ask for two daughters-in-law, or our head of the family is kind and righteous to us, what kind of thing is Liu Biao'er! Lao Tzu used to be blind before he was a soldier—"

Zhou Yu knows the importance of psychological warfare, the ideological education and psychological counseling of later generations are very powerful, and there are two kinds of soldiers participating in the war now, one is really a single person who can't survive, and he is a soldier just to be able to find a way to earn some money for selling his life, and the other is the military service that is shared by the government at home, if he doesn't go to military service, then he can only spend money! Ordinary poor people have difficulty making ends meet, and who doesn't want to live a good life.

"Bastard—what are you all doing in a daze? Hurry up and restrain each other's deployments, and don't have a howling camp at that time! Looking at Liu Biao, who was so angry that his face was almost green, Wen Ping hurriedly opened his mouth to deploy defense, and at this time he could only go down the city wall and enter the temporary camp directly. This cannon shattered their confidence in their hearts in an instant—

Xiangyang City began to hold their shields above their heads, which really scared them enough just now. Zhou Yu's trebuchet can be said to be the most advanced long-range strike weapon of the Han Dynasty, although he has no experience in ordnance but has insight and knowledge, the lever principle used by the Han trebuchet, one end is either used by personnel or hung with boulders, and the other end is made into a net that can be thrown with stones, fireballs and other throwables. It's just that Zhou Yu found that this is really very labor-intensive, and it takes a lot of people to move stones, operate trebuchets and maintain trebuchets, so the bulky trebuchet is not easy to carry, so he suggested that craftsmen start to improve trebuchets, add a collapsible base under the trebuchet, fix it on the ground when it is used, fold it up and install wooden wheels when not in use, and increase mobility.

The trebuchet threw heavy objects that were easy to break, so Zhou Yu asked craftsmen to cut down bamboo and improve it according to the prototype of the hydraulic rod, so that the weight was combined with a flexible bamboo hydraulic rod, and the throwing distance was greatly increased. The next thing is that the trebuchet needs to move the trebuchet back and forth for aiming, but the craftsmen have a way to open their brains and install winches and pulleys, and the improved trebuchet will let Zhou Yu bring out ten planes this time to deal with Xiangyang City, and five of them will be removed from the warship to deal with Xiangyang City, and the rest will be left on the warship for defense.

Zhou Yu was also watching from below the city, he also didn't expect the improved trebuchet to be so good, he was going to throw stones, he opened his mouth to stop and let all of them be replaced with fireballs, and for a while five trebuchets began to throw fireballs.

The fireballs were flammable, and some flew to the city wall and set fire to the city drums, flagpoles, and giant trees, and the city wall became a sea of fire. The people on the city wall were busy fighting the fire, so if they interfered with the defense on the city wall, it would be a little lax.

"Order-the firebombs to stop attacking, all of them will be replaced with boulders to attack the city towers and city gates, and the artillery department will take turns in three shifts to bombard the city walls without interruption - the whole army will attack the city early tomorrow morning!" Anyway, this order is to put it bluntly, as long as the trebuchet can hold on, the masonry wall will always be collapsed under the bombardment of boulders, and the raid battle in the dark night is not easy to fight, and the siege needs to use a ladder to increase your own casualties if the enemy counterattacks.

Tonight it will be the stone to greet Liu Biao, and tomorrow it will be to take Xiangyang in one go.