Making you a son-in-law is not about making you conquer the world.

Lin Ping's resolute attitude was justified. The Lotus Palace disciples were hiding in the shadows and could storm into the city at any time to kill him.

Although Lin Ping's safety can be guaranteed with Lin Xiaomei around, Jiang Yunying has to face crises at all times.

Jiang Yunying knew she couldn't go against Lin Ping's wishes, so she compromised and asked, "How does my husband want it repaired?"

The term "repair" has a broad scope, encompassing everything from repairing the surface of a city wall to raising or thickening it, and even demolishing and rebuilding it.

“Raise the overall height by one zhang!” Lin Ping answered without hesitation, startling Jiang Yunying so much that she took two steps back.

The city wall structure of Wu Kingdom continued the previous dynasty. First, the foundation was rammed on flat ground, and then two main walls, one inside and one outside, were built, separated by a distance of more than ten meters. After reaching a certain height, a city platform was laid between the inner and outer walls, which was the main activity area for soldiers.

Different sizes of gate towers were built on the city platform to serve as a means of observation.

Three-foot-high parapets were built along the inner and outer edges of the city platform for defense, and crenellations were opened in the middle of the parapets for attack.

In addition, it also includes auxiliary parts such as corner towers and horse-faced gates.

Therefore, raising the city wall as a whole was the most massive project. It not only required raising the inner and outer walls, but also demolishing and rebuilding the entire city platform.

“Husband, do you know how many bricks and stones it would take to raise the city wall by one zhang? Even if those two kilns ran all night, it would probably take a year to fire them,” Jiang Yunying explained helplessly, realizing for the first time that Lin Ping’s calculation skills were questionable.

“Oh…” Lin Ping nodded, pretending to think, “Then raise the outer parapet by one zhang (approximately 3.3 meters). In short, we can’t let the people from Lotus Palace climb over the wall.”

This time, Jiang Yunying simply didn't want to talk to him anymore.

The parapet was just a thin wall, at most three feet high. If it were raised to ten feet, it probably wouldn't even need an enemy attack; a gust of wind could blow it down. After all, the blue bricks held together by mud were not very sturdy.

"It's done!" Just as Jiang Yunying was about to find a reason to refuse, Lin Ping excitedly opened the oven door of the steamed bun kiln, only to find it filled with bluish-gray powder.

Lin Ping immediately put the plaster he had prepared into the furnace and turned up the flames again.

Seeing Lin Ping's focused expression, Jiang Yunying couldn't bear to disturb him. She half-squatted down, rested her elbows on her knees, and stared at him without moving, her hands supporting her chin.

After about fifteen minutes, Lin Ping reopened the furnace, carefully scooped out the bluish-gray powder inside, and then mixed it with sand and pebbles prepared in advance in a round mold according to the ratio. Finally, he poured in water and stirred vigorously.

After the several substances were mixed, they quickly adhered together, and after Lin Ping's trimming, they finally became the shape of a millstone.

"Wife, let's go back." Lin Ping then noticed that Jiang Yunying had been staring at him, and he felt a warmth in his heart. He couldn't let her catch a cold.

"The matter of the city wall..." Jiang Yunying reminded him, thinking that Lin Ping had forgotten about such an important matter.

"No rush, we can discuss it again tomorrow," Lin Ping replied with a smile, but a determined expression appeared on his face.

Lin Ping had just verified the effect of cement. If all goes well, it will be harder than stone. At that time, he can completely replace brick walls with concrete, which will not only save costs but also make them more durable.

As for how Lin Ping's concrete-repaired city walls held off the enemy's massive army, that's another story.

Upon returning to his residence, Lin Ping was visibly excited. He hoped that the concrete would be successfully made, which would not only enable the manufacture of barbells and the repair of city walls, but could even change the architectural style of the Wu Kingdom and the entire Asia Dynasty.

Of course, Lin Ping didn't want to popularize concrete. First, once concrete became widespread, the main city would lose its advantage, and any city could easily become impregnable. Second, Lin Ping didn't want to change the unique architectural features of ancient times, lest traditional culture be lost.

If all the monarchs of various countries had demolished their original cities and replaced them with concrete buildings, then in modern times hundreds of years later, we would not be able to see complete ancient architectural complexes, which would be a great regret, and Lin Ping would become a sinner.

Therefore, Lin Ping had to strictly control the technology. Fortunately, these craftsmen were all military households of the city lord and would not betray Lin Ping for profit.

Jiang Yunying also tossed and turned, unable to fall asleep. She felt that Lin Ping was hiding something from her, which might be of great help to the City Lord's Mansion.

The next morning, the two opened the door almost simultaneously, smiled at each other, and walked hand in hand to the training ground, instantly showering the ten thousand private soldiers with their affection.

Most people were dumbfounded, even incredulous. In their eyes, Jiang Yunying was even fiercer than a tigress and completely untamable. In other words, she didn't need a man.

However, this prince consort seemed to have inherited Wu Song's true skills, daring to openly hold Jiang Yunying's hand without getting beaten up.

"Husband, can we hold hands at night?" Jiang Yunying said speechlessly.

"No way!" Lin Ping replied arrogantly. "This left hand is mine. I can hold it however I want, wherever I want, whenever I want."

Jiang Yunying was helpless in the face of Lin Ping's shamelessness; it was her own fault for being so quick-witted as to agree to his request.

Furthermore, Jiang Yunying was always worried about one thing.

Back then, Lin Ping helped the City Lord's Mansion repay 150,000 taels of debt in exchange for a partnership. Now, he has sold 20% of the shares for 350,000 taels. In other words, Lin Ping has already paid half of the money, and half of Jiang Yunying's body belongs to Lin Ping. He can certainly make more requests.

Before long, the two returned to the ceramics workshop. Lin Ping removed the mold encased in concrete, revealing a smooth and well-proportioned millstone.

"My lady, why don't you give it a try?" Lin Ping pointed at the millstone and smiled mysteriously.

Jiang Yunying was somewhat puzzled, but it took her a long time to understand Lin Ping's meaning. She then thrust her sharp sword straight into the center of the millstone.

The moment the two made contact, bright sparks burst forth, accompanied by a crisp sound. However, Jiang Yunying's prized sword failed to pierce the millstone, leaving only a shallow mark. If it weren't for the superior quality of the sword, it would probably have been broken in two.

In an instant, Jiang Yunying was stunned, staring blankly at the seemingly inconspicuous millstone.

At the same time, Lin Ping shouted loudly, "Anyone who breaks a millstone will be rewarded with one hundred taels of silver!"

Upon hearing this, the crowd erupted in excitement, all grabbing sledgehammers and furiously smashing them against the millstone.

In his excitement, the first person used all his strength, thinking he could smash the millstone to pieces, but he was bounced back and staggered back a few steps, almost twisting his waist.

After a dozen or so hammer blows, the millstone still showed no signs of completely breaking; it only developed scratches, which was comparable to the hardest stone.

"My lady, if we use this concrete to build the parapet, I wonder what the effect would be?" Lin Ping asked with a smile.