Xilong city.

The city Lord Ning Zhenggang is also the supreme commander of the city. At the moment, he has personally walked up to the city, frowning and looking at the situation outside the city.

Knowing that time was pressing, Zheng Yuanyun outside the city did what he said and did. Thousands of stone catapults were soon erected on the river. Then the huge roar continued. For a time, the stone was like rain!

The moat under Xilong city seemed to suddenly rain with boulders. Countless boulders did not attack Xilong city wall according to Zheng Yuanyun's meaning, but directly poured into the moat from near to far distance.

Ning Zhenggang looked at his moat as if it was boiling, wildly aroused a lot of water, and his fist was gradually clenched.

Zheng Yuanyun's attempt is so clear that he can know the other party's intention as long as he is not a fool.

This is to break the river!

Just, is it that easy?

Ning Zhenggang looked at the enemy's stone catapult that seemed to never stop, and a sneer arose from the corners of his mouth.

"Someone!"

He drank softly. His men who had been on standby for a long time immediately came forward and listened to Ning Zhenggang's order: "take people upstream and drain water!"

Although this kind of thing was somewhat unexpected, Ning Zhenggang felt lucky that he had ordered people to store water in the upper reaches of the river in advance.

The moat of Xilong city is not turbulent, but it is not as calm and simple as it is now. The reason is that Ning Zhenggang had a dam built upstream earlier to reduce flow and store water.

Of course, at that time, he didn't expect that Zheng Yuanyun would use the method of throwing stones to cut off the flow so rudely and directly. Instead, he thought that if the other party got a boat or something, he could use this move to open the gate and release water in the process of crossing the River, and then use the sudden and turbulent water flow to destroy Zheng Yuanyun's offensive.

I didn't expect that this move had an unexpected effect.

Zheng Yuanyun's catapult seems to start nonstop, but everyone knows that the number of boulders in his hand is limited, that is, it will be exhausted in the end.

Now it depends on whether his stones are consumed first or whether the stones in the moat finally accumulate into a passage.

Now, when the gate is opened to release water, when the surge of hydraulic power roars, it can not only raise the water level by a large section, double the consumption of Zheng Yuanyun, but also disperse a large part of the stones, making his early investment drift.

"Sir, why don't we fight back and distract them?"

When his men were ordered to leave, the general in charge of the catapult approached him and asked for instructions.

Ning Zhenggang turned his head, looked at him seriously and said, "are you stupid or a traitor?"

"Ah?"

The general stared and pointed at himself incredulously, "my Lord, I'm a good example. I just want to share my worries for the Empire. There's nothing else!"

"Then you let me fight back?"

Ning Zhenggang sneered, "do you want to hit them or send them ammunition?"

He pointed to the city. When the general was stunned, he bowed his head in shame.

Zheng Yuanyun is not a fool. When he commands the catapult troops, he naturally takes into account the firepower at the head of the city. It's right that the other party is condescending, and the range of the catapult will be farther than him. But similarly, when there is a moat, the other party is barely able to let the catapult attack a little farther ahead of the river.

The catapult troops commanded by Zheng Yuanyun are stuck at this distance, and he doesn't need to attack the city wall. He just needs to dump the stones into the river. Of course, it will be far away.

Starting from the city head, Ning Zhenggang couldn't think of any effect except sending stones to each other.

He didn't really think his generals were traitors, but was disappointed at the latter's stupid idea.

At the same time, Zheng Yuanyun's side.

"My Lord!"

Without Xiao Du, the Deputy General of the Scout became the chief intelligence officer now. He quickly walked to Zheng Yuanyun, who was supervising the war in front, and reported with his hands: "as expected, they stored water upstream!"

"Oh!"

Zheng Yuanyun sneered and showed an expression that was so.

When he first came here, he felt that the water level was a little low. Now it is not a dry season. The water level in the river should not be so low. Zheng Yuanyun still knows this common sense.

So while he ordered people to throw stones, he also sent people to explore the upper reaches of the river. Sure enough, in the news brought by the deputy general, there was information that the water flow in the upper reaches was cut off.

"You can't let them open the gate to release water!"

Zheng Yuanyun turned his eyebrows and stared at his vanguard general.

The latter understood and bowed to the life. With a big hand, 100000 cavalry rushed out quickly and rushed to the upstream with the pioneer.

Zheng Yuanyun had a strong army at this time. With a casual order, 100000 troops were sent out, which made him proud.

With such a strong general, why worry about the enemy city?

In addition, at the same time, Chen Ze is also issuing instructions.

"Directly cut off the brake rope!"

He snapped coldly.

The object of this order is Zhang Hualin!

Zhang Hualin, who had been monitoring Zheng Yuanyun in the dark, asked Zhang Hualin to leave temporarily when he heard that the other party was ready to pave the way for the army to attack Xilong city by throwing stones to cut off the flow.

Whether Zheng Yuanyun's army will act for a moment and a half, and Zheng Yuanyun, who has everything arranged properly, will no longer have important information to find out. Therefore, Chen Ze temporarily asked Zhang Hualin to leave Zheng Yuanyun and do a more important thing.

This is exactly what both sides think about the upstream water storage.

What Zheng Yuanyun can think of, Chen Ze can think of naturally. After he saw the moat through Zhang Hualin's eyes, the problem of low water level also appeared in his mind.

The difference is that Zheng Yuanyun asked people to explore the upstream, while Chen Ze directly asked Zhang Hualin to start first and go to the upstream of the river more than 20 miles away from Xilong city. Sure enough, he saw the temporary flood control dam.

Zheng Yuanyun's scouts still need to pass the situation back to the main camp to let the officer know, and Chen Ze didn't have this process. He clearly had seen the dam with his own eyes.

So Chen Ze's order was given to Zhang Hualin as early as Zheng Yuanyun's scouts were still on their way back.

Cut off the gate rope, which is to complete the plan first for Ning Zhenggang and release a large amount of river water stored upstream.

The dam is a temporary construction, not necessarily strong. Its principle is that a huge wooden solid fence is built at the upstream to stop the flow of the river. A steel rope is fixed on both sides of the fence to fix the vertical fence, so that the water can continue to flow only when it overflows the fence.

As long as the steel cable is cut off, even if it is only one side, the water that has been stored to the extreme will rush down, and Zheng Yuanyun must be stunned!