The inner walls of Wancheng could no longer be lowered with return cannons, so the next step was to throw rolling stones into the gap between the two walls, then lay a layer of sandbags, wait for the gap to be filled, and then attack the city.

The place where the Han army placed the return cannon and built a five-zhang high arrow tower, because of the obstruction of the outer wall, the Han army could not observe the situation in the chasm outside the city.

The purpose of building the arrow tower is to observe the chasm, so that there is a target to throw stones, so that it can be smoothed, and it will be easier for the Han army to attack the city at that time.

Wancheng is very large, and the scale is only slightly inferior to Xiangyang, such as the east wall, with a total length of more than 1,200 meters. The Han army built a total of 100 return guns, so each return gun was responsible for a width of 12 meters.

And next to each return gun, there was an arrow tower, and there were three or five soldiers on the arrow tower, either with good eyesight or with a loud voice.

If you have good eyesight, you can observe the gap between the two walls, and tell the loud cannon around you how to adjust it, and then the soldier with the loud voice will inform the person below who throws the rolling stone how to adjust the return cannon.

"Five steps back, no, two steps to the right!"

"Don't rush back, where is still empty, then throw a few stones to fill him!"

"Yes, yes, that's it, don't move this position yet!"

The loud-voiced soldiers on the arrow tower pointed to the soldiers who had lowered them to adjust the position of the return cannon.

Wancheng, the inner wall has been cut to only two zhang, and the inside of the inner wall is also full of rammed earth slag that fell when the city wall collapsed.

A large number of Wei troops gathered here.

"Why did the Shu army stop?"

"They can't be planning to attack the city, are they?"

"The city wall has collapsed, and the falling wall slag has blocked the city gate, how can they get in?"

Seeing that there was no rolling stone flying over for a while, the Wei soldiers all talked about it.

Hu Zhen said to Niu Jin: "Send a few soldiers to climb up and take a look, the throwers, the archers are ready!" ”

Originally, a lot of fire oil was poured into the gap between the two walls, but it has volatilized a lot during this time, and even if it is set on fire, I am afraid that it will not burn much. Fortunately, Hu Zhen has stored a large amount of fire oil, which is still enough.

Later, if the Han army attacked, let the soldiers climb up and throw fire oil and then shoot rockets, so that the Han army would be killed in the fire.

When Niu Jin heard this, he didn't send any soldiers, but took three steps and two steps, climbed the city wall along the rammed earth slag that had fallen under the city, and looked out.

After watching it for a while, Niu Jin jumped down and said to Hu Zhen: "Dudu, the Shu army has not attacked the city, and they are now adjusting the distance of the return artillery." ”

Hu Zhen was stunned, touched his beard and muttered: "It shouldn't be, the inner wall can't continue to be lowered, why is the Shu army adjusting back to the artillery?" ”

One of the soldiers said with random speculation: "They are not going to fill the chasm with stones!" ”

When Hu Zhen heard this, his face suddenly changed greatly, and he froze in place.

Although the soldier was guessing randomly, Hu Zhen felt that it was very likely.

If the Han army really planned to do so, then his previous direction of defending the city was completely wrong!

If Hu Zhen guessed that the Han army had this intention at the beginning, he should have mobilized manpower to dig a large pit between the two walls, with a distance of 20 meters between the two walls, and only digging the middle 10 meters range, which would not damage the city foundation and cause the city to collapse.

If the Han army wants to fill it, then the Wei army will dig it, although the digging speed is definitely not as fast as the filling, but it can delay time somewhat, right?

It's a pity that one wrong step was the wrong step, and I guessed the wrong direction of the Han army's attack at the beginning, and I prepared so much oil, rockets and dry firewood in vain, which was not useful at all.

Now although I know the intentions of the Han army, it is too late, as if I am terminally ill and there is no cure at all.

"Governor, are you ......?" Niu Jin saw that Hu Zhen's face was a little wrong after listening to the soldier's speculation, and he couldn't help but have a bad premonition in his heart.

"Boom!"

Before Niu Jin could finish speaking, he heard a violent vibration sound from outside the wall, which was not from bombarding the city wall, but from the stone hitting the ground.

Boom Boom!

Immediately, the sound of stones falling to the ground sounded again.

"The Shu army is really ......" Niu Jin's face changed greatly, and seeing that there were no stones on the city wall, Niu Jin climbed up again.

After a while, Niu Jin jumped down, and when he jumped, he stumbled and almost tripped over the rammed earth slag.

Hu Zhen originally had some hopes, maybe the Han army was not such an attempt. But seeing Niu Jin's restlessness and almost tripping, he knew that he was thinking too much.

Hu Zhen sighed and said, "Hey, how is this good!" ”

Niu Jin gritted his teeth and said: "Even if the governor thought of it at the beginning, it was just a delay of a few more days, there are still 30,000 soldiers and horses in the city, and it is a big deal to fight with the Shu army, even if the Shu army takes Wancheng, it can't make them feel better." ”

Hu Zhen nodded solemnly: "Well, I just hope that Jiangxia and Jiangdong will join forces and be able to succeed as soon as possible!" ”

It is much easier to fill the chasm than to bombard the walls, and as the rolling stones fall, the chasm is gradually filled.

In the Han army camp, the cavalry were busy carrying sand with prepared sandbags, and some soldiers were busy building ladders. Since the height of the city wall is less than two zhang, the ladder only needs to be made into a simple ladder, and there is no need to use a cloud ladder.

By noon the next day, Deng Ai sent someone to report that the rolling stones had almost been filled in and that they could be transported with sandbags.

Liu Chan ordered the soldiers to carry sandbags to the battlefield, and he himself followed.

Accompanied by Deng Ai, the two climbed an arrow tower and looked towards the chasm.

I saw that the chasm had been filled with boulders, but the shape of the stones was irregular, and even if the shape of the stones was regular, it was difficult to achieve the unity of the pieces under the drop of the return cannon, so the surface was uneven, and it was very difficult to walk on it, or even fight. If you are not careful, you will be mixed with stones, or even step on the cracks of stones.

Deng Ai pointed to the chasm and said, "Your Majesty, now that the Rolling Stone has filled the chasm seven feet deep, as long as you spread a layer of sandbags on it, you can attack." ”

Throwing sandbags, although they do not smooth the surface, is soft and much easier than fighting on uneven and angular stones.

Liu Chan nodded and said, "The chasm is eight zhang wide, and when you put sandbags, you only need to put six zhang away from us." There are two zhang left, leave it to Wei Jun to have a headache. ”

"No!" Deng Ai nodded, at this moment the soldiers had already transported the sandbags, Deng Ai looked at the soldiers below and ordered: "Prepare quickly, put the sandbags!" ”