Regent, the princess you found is a treasure

It took the coalition forces another whole night to put out the fires around the camp.

These soldiers, covered in dust and dirt from the fire, each had a big black face. They looked at each other. How should they fight this battle?

They had only been here for a few days, and they were already suffering from either poisoning or fire. They had not even had a face-to-face battle with the Yuan army, but they had already been in a lot of trouble.

The fire burned down part of the tents. General Duan could only order some people to strengthen the vigilance while the others set up tents again to rest.

After giving the order, General Duan walked into his tent with a gloomy face, followed closely by Princess Yong'an, and several other deputy generals also followed in silently.

"This must have been done by the Yuan army." said a deputy general.

"They are too despicable to resort to such despicable means," said another deputy general.

Only General Duan and Yong'an knew that this was a warning from Xuan Moyin and his team, to give them a taste of their own medicine. They sent people to set fire to Qingdu City, but few people knew about it. Now those people didn't come back, and Qingdu City didn't catch fire, so their plan had failed.

"Does anyone have any good ideas?" General Duan asked everyone.

Silence, no one spoke.

"If it doesn't work, we will just surround them but not attack. There are so many civilians and soldiers in Qingdu City. I believe their supplies will be cut off soon. I heard that the new emperor of Yuan Dynasty rejects his uncle Xuan Moyin and even delays the payment of food and wages." Yong'an said.

"Okay, immediately send someone to keep a close eye on the city gate and report at any time," said General Duan.

"Yes." The deputy general took the order and left.

The Northern Liang Kingdom was located to the north of the Yuan Kingdom. It was only March or April, but the rain had already increased. It had been drizzling for several days, and there was still no sign of stopping.

Because it had been raining, there was no movement from the coalition forces, so Su Luoxue had been staying in the backyard of the government office for the past few days, occasionally going to accompany the noble concubine.

On this day, just after waking up, Meixiang came in with some water, "Miss, you're awake."

"Well, where is the prince?" It had been raining for a week and Su Luoxue felt a bit listless.

"The prince sent someone to tell him to go to the city and take a look. It's raining every day and there's a fear that it's going to be flooded," Meixiang replied.

There was no underground drainage system in this ancient city. When it rained so heavily, the rainwater could not be drained away in time, and many places were easily flooded. Su Luoxue thought, she looked up at the gloomy sky, and was afraid that there would be a flood.

"Go to the front and give instructions. When the prince comes back, tell me immediately." She instructed Meixiang.

"Yes, miss." Meixiang hurried down.

On the side of the noble concubine, Xuan Haochen was also looking outside with a worried look on his face.

"Chen'er, what's wrong?" Concubine Dowager asked her son.

"Mother, if it rains like this every day, I'm afraid the city will be flooded." Xuan Haochen said.

"Well, mother also thinks this year is very strange. It's normal for the south to have more rain at this time of year, but it's the first time that it rains like this every day in the north." The noble concubine also looked out the window with a worried look on her face. "Go and discuss it with your uncle and see if they have any solution?"

"Okay." Xuan Moyin said, and said goodbye to his mother and went to find Xuan Moyin.

At this time, Xuan Moyin had just returned, his clothes were soaked. When he heard from his subordinates that Su Luoxue was looking for him, he immediately changed into clean clothes and came over.

On the way, he met Xuan Haochen who was looking for him, and the two went to Su Luoxue's yard together.

"What's the situation in the city?" Su Luoxue asked when she saw Xuan Moyin and Xuan Haochen coming in.

Xuan Moyin naturally took her hand, walked to the table and sat down. Meixiang and Banxia served hot tea to the three of them.

Xuan Moyin took a sip of hot tea to warm himself up. "Oh no, water has accumulated in many places, especially in the alleys. The water is up to my calves and there is no way to drain it out. I'm worried that if the rain doesn't stop, the water will get deeper and deeper."

"Uncle, what should we do? Can we think of a way to drain the water?" Xuan Haochen said.

"Now General Chen and General Song have led people to drain the water, but the rain keeps falling and the water can't be drained completely." Xuan Moyin said.

Su Luoxue didn't say anything. She was thinking about the siphon pumping method she had learned in physics class. There was a natural river in the city of Qingdu. If water was sucked into the river, as long as the river was not blocked, the water would flow away quickly. And there happened to be a long transparent water pipe in the utility room of her laboratory.

Thinking of this, she quickly said: "I have a way, using the siphon pumping method."

"Siphon pumping method?" Xuan Moyin and Xuan Haochen listened to this new term and looked at Su Luoxue with ignorance.

"The method is like this..." Su Luoxue explained to them in detail the principle of siphon pumping, as well as the precautions for drainage, etc. Finally, with Su Luoxue's explanation while talking and drawing, the two finally understood it.

"Then, what about this water pipe..." Xuan Haochen asked

"I have it." Su Luoxue said. "Just go and call some people over."

While Xuan Haochen was out calling for help, Su Luoxue took dozens of water pipes from the space and piled them in the yard.

When Xuan Haochen and his men came over again, they saw the yard full of water pipes. He was stunned. This... was clearly not there when he came just now. Looking at his uncle, Xuan Moyin just pretended to be serious and said, "Why are you looking at me? Hurry up and move."

Then he turned to Su Luoxue and said, "It's raining heavily, don't go out, just wait in the mansion."

"He, be careful." Su Luoxue said.

"Well, don't worry!" Xuan Moyin said, then turned around and walked outside.

"Send someone to the military camp and ask them to boil more ginger water for the soldiers to drink." Su Luoxue called the guards and gave the order.

In the military camp of the joint army of Beiliang and Hongnan, twenty miles away from Qingdu City, these soldiers were not having an easy time.

"What kind of awful weather is this! It's been raining for nearly ten days straight, and there's no sign of stopping." Princess Yong'an complained anxiously.

The maid standing beside her lowered her head cautiously, not daring to breathe.

"Where is General Duan now?" Princess Yong'an turned around and called the guard at the door into the house and asked.

"Your Highness, General Duan has been leading people to dig drainage ditches in the camp early this morning." The guard replied respectfully.

"Dig, dig, dig. All they do all day is dig! The rain keeps falling. What's the point of just digging ditches?" Princess Yong'an had obviously lost her patience, and her tone was full of dissatisfaction and complaints.

"Call General Duan here immediately and tell him that I want to see him." Princess Yong'an once again gave orders to the guards outside the door.

"Yes, sir!" After receiving the order, the guard rushed into the rain without hesitation and ran quickly into the distance.