Xiao Wanli suddenly grasped the key.

There were Song army ships on the Yuli River, and they could not go to support Xiao Xiaomu, but if they could destroy the Song army ships on the Yuli River, then the Song army's defense line would be directly torn open.

The Liao army could then build a pontoon bridge across the Yuli River, allowing the Liao troops on the east and west sides to communicate with each other and no longer be separated and unable to concentrate their forces as before.

"Yes."

Shulü Chuoliji said.

“How high did it go?”

"It probably made the Song army's ships two feet higher."

"That's all?"

Xiao Wanli frowned.

Logically speaking, the higher the water level, the more disadvantageous it is for them.

This means that the higher the horizontal line of the Song army's ships, the less difficult it will be to hit the shore as before.

But the low water level also means that the water flow is not very turbulent, which poses no threat to the Song army's ships. At most, it will cause the ships to sway.

Shulü Chuoliji smiled bitterly and said, "The water level of the Yu River had already dropped a lot before. The heavy rain has just started, so I'm afraid it won't rise so quickly."

"Then let the Yushui River flow faster and the water level higher!"

Xiao Wanli said with a grim smile.

"Your Majesty, do you mean to store water and flood the river?"

Shulü Chuoliji immediately understood what Xiao Wanli meant.

"You go and take care of this!"

Xiao Wanli said.

"yes."

Shulü Chuoliji immediately reined in his horse and rode away.

The Yuli River originates from Jiaoshan. Due to heavy rain in the upper reaches, the water level must have risen sharply.

All he had to do was build a small dam in the mountains to block the source, and soon enough water would rush down to overwhelm the ships.

The sky was getting darker and darker. It was the beginning of the You hour, around five in the afternoon, but it felt like seven o'clock.

It seemed as if only a hint of dimness remained between heaven and earth.

As the loud horn sounds spread, the Liao army from all directions began to attack Yumen Pass again.

It is true that the Song army's combat effectiveness declined, but in fact the Liao army was just like that.

No one could display such unparalleled elite momentum in the midst of heavy rain and darkness, not even the Liao army, which was once powerful in field battles.

This led to the Liao army's attacks being chaotic, with problems such as command disorganization and disorderly attacks frequently occurring.

Gunshots were fired and grenades were thrown from the top of the city wall. Some people were rushing forward, while others were watching. Whenever a ladder was put up, no one dared to climb it.

Because the Song army would definitely throw a few grenades down from the parapet, many ladders would be blown off directly.

There was a crackling rain above our heads, and grenades were thrown down from time to time. Everyone was scared and no one wanted to be the next victim.

Although the Liao army also had grenades, due to the strong wind and rain, many of the grenades could not be thrown to the top of the city.

After all, for ordinary people, the limit is to throw it 20 or 30 meters away, not to mention throwing it more than ten feet high in the wind and rain, which is more than three or four meters above the city wall.

The two sides fought back and forth all night long.

At the beginning of the Yin hour, the Liao army finally withdrew, leaving behind more than a thousand corpses outside Yumen Pass.

The Song army on the city wall was not having a good time either. There were only more than a thousand defenders in the city, and they had to fight to the death with tens of thousands of Liao troops outside the city, which cost them a huge price.

If the Song army on the Yuli River had not tried every possible way to provide assistance, such as firing cannons in the rain, or shooting from a distance to harass the Liao army attacking the city, Yumen Pass would probably have changed hands by now.

"Report, Marshal, the Liao army has retreated."

"Report, Marshal, the city is beginning to rise, and a lot of our gunpowder has been soaked."

"Report, Marshal, twenty-one guns have been flooded and misfired."

"Report, our grenade reserves are low."

.

Various bad news came one after another, and Di Qing's face was as gloomy as water.

Although he had been commanding calmly on the city wall all night and repelled several attacks from the Liao army, he did not feel tired at all.

Even though his eyes were bloodshot, he didn't show any emotion, as if the bad news had no effect on him at all.

After a while, the sky gradually brightened. Around six o'clock in the morning, the world went from being pitch black to being covered in gray fog.

The heavy rain was still pounding down overhead when Liu Du, deputy commander of the Pinghai Navy, hurried over and said, "Report, Commander Di, the water level of the Yushui River is starting to drop."

"Has it gone down?"

Di Qing's expression finally showed a slight change, and he said thoughtfully: "How much has it dropped?"

"About five or six inches."

"Sure enough, the Liao army will definitely store water in Jiaoshan."

"What should we do?"

Liu Du asked, "Should we withdraw all the boats from the river now?"

"No."

Di Qing narrowed his eyes. "Once the boats leave, they'll realize the point of storing water is useless. They'll then immediately release the floodwaters. Once the floodwaters recede, they'll be able to build a pontoon bridge and rescue the west bank."

Di Qing then asked, "How are Hu Yanshouyong and Wang Kui doing?"

"No news yet."

"Go and explore."

"yes."

Liu Du took the order and left.

Xiao Wanli guessed correctly. Some of the Song army's ships left the dock and were indeed going to attack Xiao Xiaomu.

In recent days, the main attack direction of the Song army has been Xiao Xiaomu. After several days of fighting, Xiao Xiaomu suffered heavy losses and is now in a slightly weak condition.

The dock and the boats on the Yushui River were the Song army's backup plan for retreat, and also their last trump card.

The card at the dock has been played, and the only things left are the boats on the Yuli River. Once the Liao army successfully uses the flood to destroy the boats, the Song army will have no way out and no backup plan.

It has to be said that the Liao army also had experts.

My dear, there is more to this chapter. Please click on the next page to continue reading. It will be even more exciting later!