However, Chen Yaoguang didn't see these rivers at all. She immediately thought that when the Mongols attacked the city, they liked to use one of the most popular methods, which was to flood the city! Whether it was China or Europe, for the convenience of obtaining water, cities were generally built by the water.

This also provided great convenience for the Mongolians to dig rivers and flood towns.

Therefore, the Mongolians often used this technique. Now that the water that should come has not come, Chen Yaoguang immediately recorded this important information.

After that, the Mongols also began to build forts in four directions, southeast, west and north.

Of course, such actions cannot be hidden from the lookout whistle on the Thunder Fortress.

But Liu Ming and the others could not risk the artillery to push out the fortresses and attack these fortresses, so they could only watch the other party make a big move.

Then when the city walls began to be built between the four fortresses and looked like a thick dam, Chen Yaoguang completely understood the enemy's plan! The current situation is: Even if the Thunder Fortress was flooded by the Lightning River, they would not fall immediately.

Because the fortress has sufficient soldiers and food, it is no problem to stick to it.

However, if the Thunder Fortress is submerged, it is in the center of an isolated island with water on all sides and is threatened by artillery on the dam, the task of blocking the enemy's retreat in the future will be difficult to complete.

So Chen Yaoguang was now calculating quickly because they were trying every means to protect the mines within a range of 500 meters around the fortress.

According to the requirements of the Head of State Shen Mo for the fortress defense, tens of thousands of mines have been buried in the large tract of land around the fortress.

Without other defensive offensives, just these mines are enough for the Mongols to consume tens of thousands of lives.

However, if the river water floods, these landmines filled with gunpowder will fail even if they are sealed and soaked in the water for a long time.

When the water rushes down and pours into this huge earthen city, an isolated island will form near the higher Thunder Fortress.

After the water volume increases, the island will be submerged, and the river will continue to flood the city of Thunder Fortress.

By then these mines will be destroyed.

So Chen Yaoguang was desperately calculating the water storage capacity upstream of the Lightning River dam.

After Chen Yaoguang listed the long formula and finally diluted the water upstream of the dam in this huge earth city with a diameter of twelve miles, she calculated the height of the land around the Thunder Fortress.

Then Chen Yaoguang drew a big circle around the Thunder Fortress on the map... Yu Jie and Bu Yucheng immediately surrounded him.

They looked at the map and then breathed a sigh of relief! According to Chen Yaoguang's calculations, if the Mongolian army releases water, it will not be able to flood the minefields outside the Thunder Fortress.

But the two of them frowned again... If time goes back a few days, the minefield will inevitably be submerged.

Whether to remove the mine now or leave it there has become an urgent question.

Now that if you want to reclaim the mines in the minefield into the fortress, the soldiers have to go out to clear the mines, which is a certain risk. After all, these soldiers have to run as far as five hundred meters away from the fortress.

Moreover, after removing the insurance needle and hanging the fuze, tens of thousands of landmines wanted to be removed safely, which was very difficult.

However, if these mines are left there and ignore them, a large number of mines may fail and may even be hit by the current of water. At that time, it will be difficult for the people in the Thunder Fortress to go out and it will be difficult for them to be safe! The current situation is a difficult situation for them, which is particularly painful.

...At this moment, Yu Jie couldn't help but think of the balloon team that took the risk of rushing to the ground for investigation and then bravely exploded after being hit.

I don’t know if they have clearly seen the situation of the enemy dams and canals on the ground, and have they handed over the information to the head of state?

When the two heroes died, when the tragic flames soared, the officers and soldiers in the Thunder Fortress were all united in hatred and full of anger! Now that their Thunder Fortress is not informed and facing difficulties, how should they overcome this difficulty?

Just when Yu Jie and Bu Yucheng were facing a dilemma and didn't know how to choose.

Suddenly, they heard a sharp whistle coming from the watchtower outside! When the officers rushed out of the command room, Chen Sigou above held a loud horn and shouted below: "Northwest, hot air balloon troops!"

……"What?

Are they coming again?”

At this time, Temujin gritted his teeth and quickly rushed out of his big account.

Now facing threats in the air, he must leave his golden tent as soon as possible.

Because from the air, this target is too huge and obvious, and it is not safe for Temujin to stay inside.

This incident made the Great Khan of the Grassland feel very angry. He is now sitting in a million troops, but he is still forced to move by several balloons in the air, which makes the Great Khan secretly angry.

At this time, he rode on his war horse and watched pure white hot air balloons like giant whales flying over in the distance.

However, his target did not seem to point in the direction of the Thunder Fortress, but was more northerly... Temujin frowned at this time.

At this moment, he heard someone beside him say, "No! Let's go!"

When Temujin heard this, he turned his head and saw his adopted son Yelu Wuji, who was immediately looking at the hot air balloon in the distance, and his expression changed drastically! Yelu Wuji turned his head and said anxiously: "They were heading for the dam! Our cannon..." "Retreat quickly!"

After hearing Wuji's words, Temujin suddenly woke up.

He immediately ordered his men: "Put the cannons away! Get out of the Tucheng!!"

It turned out that Yelu Wuji's words just now suddenly reminded Temujin.

If the other party was not heading towards the Mongolian army camp, but heading towards the dam.

Then there is a good chance they will drop bombs from the air and blow up the dam.

After that, the water of the Lightning River that had accumulated for more than ten days would rush out at the dam's breach and rushed into this earthen city directly along the canal built by the Mongols.

Although the amount of water storage was not much at this time, when rushing here, the water level might not be deep, and it had almost no effect on the cavalry.

But at that time, heavy artillery trucks and gunpowder and shells were afraid of water. They wanted to transport them out in this muddy pond, but they didn't know how difficult it would be! If they couldn't get their gunpowder and shells, they would suffer losses, so Temujin hurriedly ordered the artillery troops to retreat.

After he gave the order, all the Mongolian artillery soldiers immediately began to drive away the carriage and reload the heavy artillery and ammunition.

Not long after, the first batch of iron cannons rushed out of the Tucheng in the dust.
Chapter completed!