In the mysterious and deep Yangtze River valley, a large number of people on the north bank are like a long black torrent, but now they have stopped and blocked the road; The Shu military fortifications in front were a flood control embankment, blocking the passage. The noisy sound reverberated back and forth between the rocky mountains on both sides, like the roar of a mountain torrent.

The soldiers of Zhou in front of the fort were digging a ditch, and they were busy in full swing, as if they were a scene of emergency work. In the winding ditch, the soldiers were holding hoes and shovels instead of weapons, desperately digging the soil.

In this place, the ground is not stone but dirt, so the Shu army can dig a deep ditch in front of the fort, and the Zhou army can naturally dig it. Unlike the work scene, the stones were flying overhead, and the stones thrown by the stone cannon fell to the ground with a "bang". Occasionally, a stone fell into the ditch, and it smashed into the Zhou sergeant screaming.

So people couldn't help but look up at the sky while digging in the soil.

The ground outside the trench was already full of stones, and the stone cannons of the Shu army did not stop for a moment. From time to time, arrows flew in, but most of them could not reach the people in the ditch. The Shu army's passive defensive sandbag tactics could only use long-range attempts to attack the Zhou army digging a ditch, but the army did not come out and was blocked behind the deep ditch fortress by its own fortifications.

In the battalion in the rear, Guo Shao was sitting in front of a rough wooden case under the eyes of his generals. The wooden case was so rough that there was only one plank and a few stones to cushion it. With paper and pen and ink on the board, he now looks as if he were a construction engineer rather than a general.

"The ditch has been dug in front of the fort, and you two will personally go up to supervise it, continue digging as I say, and come back and report the situation in detail. You must look carefully, if something goes wrong, it is equivalent to ineffective combat! Guo Shao spoke to a general next to him.

The general cautiously asked, "Will it blow us up?" ”

"No!" Guo Shao said with certainty, "This is directional blasting, don't worry." ”

Guo Shao has never done the work of blasting, but he has seen it before and can understand and figure out the rules: ** will leak energy in the direction of the most vulnerable seal, otherwise why can't the ** without sealing explode, but will spew expanding heat energy from the gap? The cannon is similar, because the wall cannot be blown through, and the energy will be directed from the muzzle. Blowing a balloon in life, poke a small hole with a needle, and the place where the explosion and tear is also the location of the puncture.

Ren Guoshao has learned a lot of knowledge, and he doesn't know the principles of this profession very clearly, but life and insight have told him the rules.

Guo Shao pointed to the drawings and explained them to the general. This person has fought in wars and done "cave attack" before, can dig tunnels, and is good at building siege fortifications, so Guo Shao thinks that it is a little more reliable to let him supervise civil engineering operations, at least with experience. Guo Shao himself will not go up to "personally cover the cannon arrows", his head is full of stones and arrows, so close to the fortress, if he is unlucky and is stoned to death, will he not die very unjustly? He felt that if he didn't die, he wouldn't die.

…… The front army did not dig tunnels directly, it was too laborious, and it was much faster for a group of people to dig a trench in the open to get close to the fortress.

Everyone dug another earthen ditch in front of the trench fortifications of the Shu army, and brought sandbags to stack in front, less than twenty steps apart, and the two sides could see what each other looked like when they showed their heads. Rao is so close, and the Shu army can't do anything about them for a while. The heavy weapons of this era are stone throwers and ballistas, stone throwers throw stones from the head, the accuracy and frequency are limited, the most limited is of course the lethality, occasionally the stone hits, but also at most kills and injures a person; Ballistas fired flat, unable to hit people hiding in ditches.

Then the generals of the Zhou army, who were proficient in cave attack, were asking people to dig a hole in the ground, which was much simpler than digging a tunnel, and it was like digging a well, digging a hole diagonally down from the rear. After digging the hole in the ground, it is dug upwards diagonally, and the tunnel seems to be a flat "V" shape.

The hole in the ground is not deep, so it was dug in less than half a day of construction.

"Get it! Fast! The military general turned around and urged, and a stone suddenly "slammed" on the dirt ditch next to him, which also surprised him, and his neck shrank down.

I saw some people in the trench carrying stones and stones in baskets and carrying them on their backs, and there were people carrying coffins behind them. Of course, the coffin was not filled with corpses, but **, the things that the Zhou army had prepared a long time ago were originally prepared to bomb the city when the strong city could not be captured; Fortunately, the battle of Shu was prepared for a short time by the strength of the whole country, and the ** preparation was very sufficient.

It was already noon, and some of the soldiers were sitting in the ditch eating wheat cakes with water. Suddenly, there was a "bang", and when the general looked back, a soldier's head was hit by a stone cannon, and the helmet could not prevent the stone, and the soldier didn't even scream before his head broke and bled and fell into the ditch, and a wisp of blood suddenly flowed out of the helmet and soaked the mud. He still had a piece of wheat cake in his mouth. The military general looked at the bread in his mouth and scolded uncomfortably: "! ”

There were dead people everywhere, and the generals didn't bother to ask, and went into the hole himself. The other exit of the cave is facing the fortress of the Shu army, and the mouth is on the wall of the deep ditch dug by the Shu army itself, and there is still a thin layer of soil left.

There were candles lit in the cave, but the light that came through a small hole in the hole was brighter than the candles. The general leaned in front of the hole and looked outside for a while, then took the candle from the soldier's hand and carefully looked at the surrounding pit walls. The left and right sides and the bottom have been tamped with wooden spoons, and wooden beams have been erected on the top...... Rammed earth is the most familiar and exquisite work for people at this time, because at this time, whether it is to build a city wall or a private house, most of them are rammed with earth; Brick walls are a rarity.

"Stones and stones mixed with dirt are sealed in front first, so you don't have to make it too solid." The general ordered.

The soldiers with baskets in the back came up and got busy. Not long after, the military general ordered to put the coffin containing ** inside, a total of eight coffins. (Why it's eight, Guo Shao himself doesn't know why, anyway, if you put it more, you don't need to worry too much about this cost when you fight.) The lead is wrapped in an oilcloth, and the front section is wrapped with a thin bamboo tube.

After the coffin was laid, the military general ordered the soldiers to ram the earth, and the coffin was rammed with soil up and down. The pit at the back continues to ram the earth and fills it all the way to the back.

The Shu army seems to be busy with work, maybe they think that the Zhou army is digging tunnels and caves to attack, they obviously haven't figured out the situation. It is impossible to make any progress in the cave attack without ten days and a half months, and the Shu army has time to temporarily defend underground.

…… A lone light boat flying the flag of the Zhou Dynasty was on the river, and the oars on both sides of the ship were like centipedes, struggling to slowly sail upstream. "Plop ......" Some rocks fell into the river from mid-air, and the boat quickly turned around and ran down the river. There was a commotion from behind the fortress of the Shu army, as if mocking the embarrassed appearance of the ship that was peeking at the Shu army.

The flags on the ships were constantly waving from side to side.

In the front army on the shore, a military general was clasping his fists and said: "Get the order!" Then he drew his sword from his waist, raised it high, and shouted, "Attack! ”

The drums of war "knock knock" sounded, the flags on the flanks were flattened, and the infantry in a queue slowly approached forward. After a while, the stones on the head flew one after another, and there was a scream from the army. After dozens of steps, the bows and crossbows in the two-tiered fortress also shot arrows. The soldiers of Zhou were holding iron and wooden shields, and the team was already a little messy.

The wooden ladders in front of them were lowered one after another, and the shouts of "kill and kill ......" roared in the mountains, and the troops rushed forward with swords and shields. I saw the flag waving on the wooden arrow tower behind the Shu army fortress, and the defenders should have come out of the hiding hole to prepare for battle.

The soldiers of the Zhou army scrambled to climb up the wooden ladder, and the stones and arrows thrown above their heads rained down like rain.

Arrows flew in the fort, and there were even ballistas with huge arrows as thick as their arms; On the wooden fence behind the Shu army, which was higher than the fortress, the archers were taking turns to release arrows.

......The boat on the river rowed upstream again, this time there was no stone artillery to hit it, and the stone artillery of the Shu army was smashing the men and horses attacking the fortress. The ship's flag waved back and forth in a different direction.

At this time, the rear of the Zhou army was ringing, and the soldiers who had just rushed up turned around and ran, and the crowd generally went to the ebb tide.

A gong sounded, and there was a shout in the Zhou military camp. The rebels who had just retreated fell to the ground one after another under the shouting of the generals, and the scene was very strange. The soldiers in the rear stared at the front with round eyes, as if expecting something, many people held their breath, and the noise here was very strange and suddenly quieted.

At this moment, there was a sudden "boom" on the ground, and the green hills on both sides of the Yangtze River seemed to be shaken. The ground trembled distinctly, as if an earthquake had struck. In an instant, the fire and smoke erupted in front of him, and a large number of stones and earth erupted frantically like a volcanic eruption, and the "pop pop ......" stones hit the earthen fort and stone walls with a terrifying sound. It was as if they were about to destroy everything in their path, unstoppable.

Thousands of pounds of ** lifted up the deep soil surface, no matter what things flew out in the direction of the forward tilt much faster than the arrows, if those stones were not blocked, they would fly at least one or two miles away. The rapid smoke of gunpowder immediately enveloped everything in front of him, and he could not see anything.

"Boom, boom, boom, boom ......" was like a continuous muffled thunder, and the sound of explosions still echoed in the mountains on both sides of the strait for a long time. Countless people have been shaken.

A moment later, far away from the rear of the Shu army, the upper floor of the arrow tower had not yet been filled with thick smoke for the time being, "Trumble...... Boom......" The arrow tower slowly fell backwards with the sound of wood rubbing.

The soldiers of the Zhou army in the back were already shocked, and they stood there one by one, and the debris that was blown up did not affect the east, as if they had eyes, they only flew towards the sky in the west. The Shu army camp was completely shrouded in smoke, and no one knew what the situation was now, only to hear the screams of "Ahh......hh

"What are you waiting for?" There was a military general shouting loudly from behind.

"Knock knock...... A man stood in front of the big drum, threw his arms, and thundered the drum face slowly and quickly. The sound of the horn sounded, and the army came back to their senses and shouted loudly.

The soldiers who were on standby at this time were different, with wet towels around their shoulders, as if they were sweat towels to go to work.