Zhang Fei said that when he was approaching Luoyang, there was a ferry crossing, and after crossing the bridge, he reached Henan.

The ferry was very familiar to Liu Bei, Guan Yu and others, but it was completely unfamiliar to Li Mengxi.

Li Mengxi curiously asked about the ferry. He asked whether the flow of the Yellow River ferry was fast, how the ferry was built, how long it was, how many people and horses it could pass, and what the speed was. If the ferry was damaged, what should be done if it was repaired?

Emergency repairs, if the opposite side of the ferry is blocked by enemy troops, how to defeat the enemy and rush across.

After asking this series of questions, the atmosphere became silent.

After a while, Zhang Fei scratched his head and replied.

"The location of the ferry is usually a place where the water flow is gentle. The water flow of the Yellow River is rapid elsewhere. At the ferry, the horizontal river is narrow and there is no danger."

This is the first point, the geographical location of the ferry.

"The construction method of the crossing is to extend large stone piers from both sides of the bank. Thick iron chains are locked on the piers. The iron chains span the two banks. The chains are covered with wooden boards, which are palm-thick..."

From Zhang Fei's description, the ferry was originally a suspension bridge. The interesting technology is that the bridge piers extend into the river from both sides. This construction method shortens the distance between the bridge decks a lot, thereby greatly reducing the difficulty of the suspension bridge deck - the bridge piers

It's always easy to build a base. You can dig up some soil and build a base.

As for the suspension bridge, ropes and chains are used to hoist the long bridge deck. The construction is difficult and the material strength requirements are also high. It can be said that every time the suspension bridge is longer, the difficulty of erection becomes more difficult.

The forward-extended piers shorten the erection distance of the suspension bridge. This is a clever method of replacing difficulty with ease. When used in scenes where bridges need to be built, it can greatly reduce the difficulty of construction.

Li Mengxi casually drew a schematic diagram of the construction method of the bridge piers and noted the details.

Around Li Mengxi, Guan Yu was on the left and Liu Bei was on the right. They both looked at Li Mengxi's notes and saw that Li Mengxi casually drew a very vivid bridge pier. Guan Yu and Liu Bei admired Li Mengxi's painting skills.

An important construction method is obtained, [bridge pier forward projection and shrinkage method]. This method reduces the difficulty of building a bridge by 20%. According to this method, you can directly put a few ships across the shore without the piers, and it will still work.

Shorten the distance between the rivers. This method is more reasonable than the chain-locking method, because if the iron-locked boats are connected, the water flow will impact the entire fleet, and the ships will inevitably wander downward. If so, in the middle of the iron-locked boats,

Deliberately leave a section, the middle section with the most turbulent water flow, to set up a pontoon bridge. In this way, the water flow in the center of the river has a channel to vent from the middle, which greatly reduces the impact force on the ship, making the entire pontoon bridge structure more stable.

For stability.

Therefore, Li Mengxi gained three pieces of knowledge from the bridge piers at the Yellow River Ferry. One was the bridge pier itself, the other was the general suspension bridge method to reduce the difficulty, and the other was the iron-locked ship-linked structure. One or two ships could be missing in the middle for pouring water.

Zhang Fei also said, "The length of the crossing bridge is thirty to fifty feet, and its width is enough for several cars to run parallel to each other.

As for the traffic speed... I have never paid attention to this."

Although Zhang Fei did not pay attention to the traffic speed, Li Mengxi could probably judge that the crossing bridge was wide enough for several cars to pass abreast, and the crossing bridge was flat, so the traffic speed would even be faster than that on flat ground. Because the road on flat ground was bumpy and bumpy, while the water surface was stable, the bridge deck

Therefore, it is also flat, so cars and horses can pass very quickly. If it happens to be a heavy rain and the road is muddy, the traffic speed on the bridge will be faster than on land.

From this, Li Mengxi realized a problem, that is, most of the time, bridges are much flatter than normal roads.

From this, it seems that the topographic advantage of the bridge deck can be exploited.

For example, when it is raining heavily, we can form our formation on a bridge. In this way, the enemy can only form in a muddy place. In this way, our place is flat and our formation is in order, while the enemy's place is muddy and they can't even walk.

If you don't move, the formation will naturally become chaotic. If you persist for a long time, the enemy will be defeated.

It can be seen from this that buildings with transportation advantages such as bridges are indeed battlegrounds for military strategists.

When Li Mengxi told everyone what he wanted, Guan Yu thought for a moment, frowned and pointed out Li Mengxi's shortcomings.

"Xi'er, there are some unexpected things here.

The terrain of the bridge is flat, but the bridge is narrow. When you line up on the bridge, doesn't it feel like you are in the corridor of the city gate?

Think about it, when we attack the city, our troops are in the city gate hole, and the enemy surrounds the city gate hole. The inside of the hole is narrow, but the outside of the hole is wide. There can only be three or five rows in the hole, but there are more than ten rows outside the hole. So

, rushed out of the cave, and as soon as he came out, he was surrounded on all sides."

"Isn't it the same on the bridge?

The bridge is narrow, but the shore is extremely wide. If you stay on the bridge, you will have no power to move forward.

Moreover, there are different city gates on the bridge, and the city gate opening is a corridor. If an arrow is lost, you cannot penetrate from the left and right. You can cross the bridge, which is open and open. The enemy soldiers are widely spread on the shore, and thousands of bows and crossbows are coming to shoot.

How can we be successful with a meager formation on the bridge?

Furthermore, crossing a bridge is very different from that of a city. The city gate cannot be damaged, but the crossing bridge can be damaged. You can line up on the bridge and have hundreds of elite soldiers lined up. If the enemy cuts off the iron locks or sets fire to the bridge, the bridge will be damaged.

A few hundred elite soldiers will disappear in an instant?"

After Guan Yu finished speaking, Li Mengxi fell into deep thought. It seems to be true. The bridge is indeed extremely flat. It is indeed a good location on the bridge deck in the heavy rain and muddy weather. However, if you hold on to the bridge,

The troops on the bridge must be close to the enemy and far away from our troops on the other side. Moreover, the bridge deck is narrow and the troops cannot be deployed. Therefore, the soldiers on the bridge must be completely exposed to the intensive long-range attacks of the enemy on the shore. The enemy on the shore has enough

There was no space to give full play to the advantages of crossbows. Thousands of enemy crossbows were fired at the bridge intensively. It was almost conceivable that the soldiers guarding the bridge would be killed and injured.

Moreover, as Guan Yu said, the bridge deck is similar to the city gate opening. Defending the bridge instead of guarding the shore means completely giving up the possibility of attacking. If you want to attack from the bridge deck, you will be surrounded by the enemy as soon as you leave the bridge.

, the attack is a big disadvantage.

Not to mention, the bridge is easily damaged. No matter how elite the soldiers on the bridge are, they will inevitably fall into the water when the bridge breaks. Even the enemy does not need to completely damage the crossing bridge to knock our soldiers on the bridge into the water. The enemy

The army can use ropes to tie up the iron chains first, and then cut the iron chains. When the iron chains break, the bridge full of people will fall into the river. When everyone falls, hundreds of enemy soldiers will pull the ropes and then cut them off.

Pull up the bridge and tie the rope when it's done. The bridge will be restored again without affecting its use at all.

This chapter is not over yet, please click on the next page to continue reading! The enemy did not need to lose any troops or damage the crossing bridge. They just threw all the hundreds of elites on our bridge into the river and drowned. It was so embarrassing.

Li Mengxi realized that guarding the bridge was really a stupid tactic.

However, it seems not absolute.

The biggest disadvantage of guarding the bridge is that it cannot defend against the superior long-range attack of the enemy on the opposite side. But thinking about it conversely, if the enemy does not have long-range, or its long-range strength is weak, it will not be able to compare with the crossbowmen on our bridge. At this time,

Keeping the bridge may be a very good option.

Suppose the scene is that it is raining heavily and the ground is muddy. It is also known that thousands of enemy cavalry are coming to cross the bridge. At this time, there are only thousands of infantry in hand. How to block the enemy? The answer is to guard the enemy.

On the bridge, guard the bridge head to resist the enemy. In the small area of ​​​​the bridge head, we are on a flat and clean bridge deck. In front of our position, on the shore, is a muddy and slippery road.

, the enemy and we are facing each other in this small area at the bridgehead. If the enemy is fighting with me in the mud, the enemy's formation cannot be organized, the support cannot be rapid, and the soldiers can't even lift their legs, how can they fight with me.

Moreover, the enemy has thousands of cavalry, but the bridge deck is narrow and there is no room for the cavalry to charge. The bridge deck is inferior to the cavalry, which is a desperate situation.

When the enemy's thousands of cavalry encounter our formation on the bridge, they can only charge hard. Only three or five cavalry can rush forward in one row at a time, and there is almost no impact.

And if the enemy wants to use bows and crossbows to hit our soldiers at the bridgehead from a distance, then we have thousands of people on the bridgehead and hundreds of crossbows. The strength of the cavalry bows and crossbows is much weaker than that of the foot bows and foot crossbows, and the range is also weaker than that of the foot bows and foot crossbows. The enemy is far away

He is weak to me, how can he compete with me?

Therefore, the applicable situation of the bridge guarding tactic is now available. This tactic can and can only be used when the bridge is strong and difficult to be damaged, and the enemy's long-range power is much weaker than the long-range power of my bridge guarding soldiers, and I only need to defend.

When there is no need for any sudden advance, it is only at this time that defending the bridge is a wise tactic. Only when it is raining heavily and the ground is muddy, holding on to the bridge can have the greatest advantage.

Attack and defense have always been two sides of the same coin. When Li Mengxi learned about the tactic of defending on the bridge, he also thought about how to deal with the enemy's defense on the bridge.

If the enemy is defending on the bridge, the enemy on the bridge is close to us at this time, and our bows and crossbows have a great advantage. When our bows and crossbows have a great advantage, why send people to the bridge to fight? We can directly

Call in a large number of crossbowmen and shoot randomly to destroy the enemies on the bridge.

And if the bridge body is fragile and easily damaged, you can first tie the bridge with strong ropes, and then cut off the iron chains. Once the iron chains are broken, there will be a crash, and all the enemies on the bridge will fall into the water, and the bridge will be empty.

The enemy can pull up the bridge again without delaying traffic.

If our side does not have any crossbows, or if our crossbows are incapable of defeating the enemy on the bridge, then we go up to the bridge to engage in hand-to-hand combat with the enemy. On the bridge deck, the width and width are the same. Our advancing position is the same as the enemy's defending position, and we have the same advantage.

point.

But if by chance it rains heavily and the ground is muddy, and the enemy is guarding the bridge, and we are in the mud, and we are fighting within a few inches of the bridge, we will be at a great disadvantage, so we should avoid them at all costs.

If it is raining heavily and you have to fight with the enemy at the bridgehead, you should take the trouble to bring in as many crossbows and javelins as possible to kill the enemy at the bridgehead as much as possible and avoid hand-to-hand combat at a disadvantage.

When Li Mengxi first defended and then attacked, after deducing the offensive and defensive tactics on the bridge, a subsequent question arose.

"Suppose two armies are deployed on the left and right banks, each with tens of thousands of soldiers. One side wants to defend the bridge, and the other side wants to cross the bridge. How should we defend? How should we attack? What is the key to defense, and what is the key to attack?

what?"

Li Mengxi drew a picture of a long bridge on the paper and placed it in the middle. He started discussing with everyone.

Guan Yu's eyes stayed on the simple long bridge drawn on the paper. He frowned slightly, twirled his long beard with his hand, and his eyes showed thinking.

Liu Bei also stared at the paper and frowned.

Zhang Fei frowned and scratched his head.

Jian Yong put his hands in his hands, frowned slightly, and his eyes were focused.

The simple long bridge drawn on the paper turned into a fierce battlefield in the eyes of everyone, with thousands of troops and horses fighting.

Li Mengxi looked from one end of the bridge to the other, and then from that end to this end. He felt that the attack on the bridge was very similar to the attack in the city gate. They were both a long passage with one exit.

The passage is facing siege. The difference is that the bridge is a two-way city. No matter whether you go left or right, it is like a city gate. No matter whether you go out from the left or the right, you will definitely be surrounded as soon as you step out of the bridge.

Another difference is that the city gate cave will not be attacked by bows and arrows coming from the left and right, while the bridge deck will be attacked by a large number of bows and arrows.

Sitting and thinking, unable to figure out what was going on, Li Mengxi invited Guan Yu to join him in a game.

"I'll attack." Li Mengxi said.

"Then I will keep guard." Guan Yu said.

On the attacking side, Li Mengxi is the main attacker, Zhang Fei is willing to join the attacking side, Guan Yu is the defending side, Liu Bei and Jian Yong all assist Guan Yu.

The attack began, and at the first point of battle, Li Mengxi touched his chin and examined the long bridge for a long time, then frowned and asked, "If I attack from the shore, General Guan, where will you defend? At the head of the bridge? At the center of the bridge."
To be continued...