If Guo Xing'a really had a way to instantly increase his combat power, he would have led his troops out of the city to hack Huang Daping to death, how could he be blocked by Huang Daping in the city gate and didn't dare to move. His so-called method of 10,000 enemies needs to add a prefix to defend against 10,000 enemies. If Yu Wendao is a wood of the five elements, then Guoxinga is absolutely a soil of the five elements, and the Qing army carries shovels and shovels wherever they go.

A piece of earth plus a piece of wood, not the word Du, is civil engineering. Guo Xing'a, who was not addicted to digging in the deserted village, began to give Yu Wendao the idea to dig a hole. In the beautiful blueprint outlined by Guoxing'a, Qiqiao Town will be completely hollowed out, and all living materials will be transferred underground. When the Taiping army came to attack, Qingzhuang first defended on the city wall, and once the city wall was lost, the whole city went underground, and began to fight tunnel warfare and street fighting with the Taiping army. Even if the Taiping army demolished all the surface buildings in Qiqiao Town, they would have to dig three feet into the ground, otherwise they would not want to occupy this place.

The area of Qiqiao Town is more than ten times the size of a deserted village, and the Taiping army did not send tens of thousands of troops, and it took several months, and it was impossible to dig up a huge network of tunnels. Moreover, Guo Xing'a also suggested that Yu Wendao have time in the future to dig an escape passage to the North Mountain, even if there is really a day when someone digs it out, the people can flee to the mountain, and the Taiping army, which is busy digging the earth, will definitely not divide their troops to pursue.

"The adults are highly talented, and Wen Dao admires them to the fullest!" After listening to Guoxing's words, Yu Wendao was completely shocked.

"It's not what I thought of, Yang Liulang's idea in the Northern Song Dynasty, there are many holes in Hebei that they dug up." Guo Xing'a can't pull the Eighth Route Army's military engineering team, but there are still sages, and Yang Yanzhao has dug an extremely large underground defense network in Hebei.

Yu Wendao's efficiency also frightened Guo Xing'a. After the noon farewell, half of the people were evacuated to the city in the afternoon, and every household began to prepare tools for digging the earth, even the wood, masonry, and stone. When they couldn't find a suitable girder, they demolished the houses in the city. After a busy night's work, when Goxinga saw him again the next day, the people had already prepared everything and were just waiting for the ground to start.

Looking at the detailed map of Qiqiao Town spread out on the table, Guo Xing'a was a little stupid, he really hoped that Huang Daping would capture the city now and relieve his pressure. When planning yesterday, although Guo Xing'a said that he was full of pride, in fact, he repeated the original idea of being in a deserted village, and did not think specifically about what to do in small Nanjing.

"My lord, what's wrong!" Seeing Guoxing's rooster shaving on the detailed map for a long time, Yu Wendao asked with concern. Yesterday, after listening to Guo Xing's thoughts, Yu Wendao got drunk, and when he went back and thought about it for another night, he was even more addicted. It can be said that all Yu Wendao's hopes for life and the future are now bet on this underground defense system. But now the chief planner Guo Xing'a seems to have fallen into evil, he didn't say a word, he made a stroke on the map, his face was sweating, and Yu Wendao was even more nervous.

The Maginot Line of the French, the sewers of the Teenage Mutant Ninja Turtles, the Matsuyama Tunnel of the Japanese devils, the Dongning Fortress, etc., flashed through Goxinga's mind like a movie, and the problem seemed to be a little unreliable. Suddenly, Guo Xinga thought of a suitable plan, to be precise, a combination of several plans.

On the surface, according to the Xie Castle in the Taihang Mountains, all the courtyard buildings in the town are connected into a network with internal and external secret passages, and the whole town is connected by light and dark channels, and the commanding heights such as two-story buildings and drum towers in the city are used to build a solid defense network system. The underground first absorbs the experience of tunnel warfare and deserted village bunkers, and then imitates the Iwo Jima tunnels of the devils to build a three-dimensional network of underground defense and counterattack on the surface.

Goxinga froze for a long time, and then suddenly sprayed like a machine gun for a full quarter of an hour, and everyone present was stunned. Yu Wendao was even more dumbfounded and speechless, and regarded Guoxinga as a god. After scrutinizing the rough details again, Yu Wendao walked away with the construction drawings in his arms. Guo Xing'a sat on the chair and gasped, and it was actually quite tiring to open the golden finger, after all, it was very difficult to find a few specific details in his memories.

In the next ten days, the Taiping army died down, the Qing army opened the furnace and cast cannons, the people dug frantically, and everyone seemed to have found their favorite careers, temporarily putting down the business of fighting each other. Guo Xing'a usually went to inspect the sappers to forge artillery, or fooled around with his sisters in the city tower. But once when he went to the city to instruct the villagers to dig tunnels, Guo Xing'a discovered an interesting thing.

In order to prevent the tunnel from collapsing, the tunnel must be covered with a wooden frame at intervals, and the Qing army also did this work soon after. However, the Qing army used three long wooden beams to build a rectangular frame, but what Guo Xing'a saw on the construction site of the people was only small wooden blocks section by section. When looking at the tunnel entrance, Guo Xing'a found that the people's tunnels were not square, and they were all arch-shaped structures.

"How?" Goxinga was curious.

"It's just a mortise and tenon." Yu Wendao picked up a few pieces of wood and put them together, then took some small wooden strips, and inserted them into the joint, and several pieces of wood were firmly connected together. If it weren't for the fact that the gaps could not be completely covered, they would be almost indistinguishable from a whole wooden beam.

"This is the mortise and tenon structure!" Guo Xing'a also picked up a few pens and stroked them, which was very interesting like building blocks.

"Exactly! The young and strong have to defend the city, and the women, children and the elderly are already quite tired from digging the soil, and the large beams and wooden pillars are inconvenient to carry, so this emergency method is used. The ancestors were all woodworkers, and they all played with this thing when they were children. Yu Wendao said with a smile.

"Can you spell out any shape?" Guo Xing'a was a little curious, and at first thought it could only be a simple connection, but seeing that Yu Wendao actually spelled out a circle, Guo Xing'a immediately became interested.

"It's all about the common ones! The wood into the hole also, called the "tenon", the end of the wood into the hole, that is, "Mao". The mortise and tenon joints are connected and can be made into utensils. Yu Wendao said like an endorsement.

"You can build a bridge and show me!" Yu Wendao dropped his schoolbag, Guo Xing'a didn't understand much, but he really wanted to see if he could build a bridge to get out.

Yu Wendao didn't talk nonsense anymore, and neatly spliced a miniature arch bridge out, but there were a few places that could not be spliced halfway, so he added a few large logs into it by himself. Yu Wendao's wooden bridge is not beautiful, but it is quite reliable, and Guo Xing'a stepped on it a few times.

Goxinga walked on the bridge and fell into deep thought again. The small bridge is not long, and Goxinga walks a few steps to the end.

"My lord, if you are interested, you can go a little longer." Yu Wendao saw Guo Xing'a stop at the bridge, thinking that he hadn't had enough fun as a young man, and he didn't want to turn back. Hurriedly put together another similar bridge, pulled to the head of the bridge, a few wooden strips were inserted, and the two bridges were immediately integrated.

Guo Xing'a walked down the bridge that Yu Wendao took out, and when he looked back, he couldn't find where the connection was.

"Looks like there's something to worry about Mr. Yu!" Guo Xing'a looked at Yu Wendao very reluctantly.

It's not that there are no carpenters in the base camp of the deserted village in Goxinga, and it's not that they don't know how to make mortise and tenon joints, but it's too mediocre. Just like making authentic beams, the carpenters of Guoxinga also used mortise and tenon joints, but it was a big wood falling on a big log, which was time-consuming and laborious. And Yu Wendao just wanted to save the physical strength of the blind dates, so he cleverly came up with a small piece of splicing. It is not inferior to the whole wood, and it is much less labor-intensive for maintenance, handling, and installation.

This is actually normal, Guo Xing'a, the carpenter who can't remember his name, is living by doing carpentry, how can there be so many whimsical ideas, and it is true to do the work stupidly. And although Yu Wendao also understands carpentry, he is a young master, and woodworking is just a toy he played with when he was a child, since it is a toy, there is naturally endless whimsy. The carpenter's grandfather, Lu Ban, is called the public loss class, and he is also a serious aristocrat, otherwise where would he be so free.

It's not that the aristocracy is stronger than the common people, but in response to the famous saying, if you don't have enough food, you can't be beautiful. People work hard every day, just for two meals and one night, where does the tired brain have time to create. And it is not uncommon for the nobles to be fed and have nothing to do all day long, and to make some new gadgets to entertain themselves when they are extremely bored. And these self-entertaining gadgets are likely to be a fatal invention. *Isn't it just a few people who are crazy and have practiced in the alchemy furnace.

However, the real life and death situation still depends on the working people, and Dujiangyan, Zhengguoqu, and Beijing City were not made by the working people. If you can't get it out, you will die, and God can't imagine the wisdom of the working people exploding in an instant.

"Brother is not smart, it's the troubles of life, so that brother doesn't have to think."

Guoxinga is very utopian, he didn't expect it for too long-term, and what he urgently needs at the moment is the same thing that comes to mind - a pontoon bridge. Anyone can build a pontoon bridge, but what Goxinga wants is a folding bridge that can maneuver with the army. The Americans were able to escape from the encirclement of the volunteers in North Korea, and the folding bridge was the first to be credited, and the airdropped folding bridge allowed the American army to run away from various places.

The cavalry was deflated everywhere in the south of the Yangtze River, because the water network in the south of the Yangtze River was dense, and it was difficult for the cavalry to maneuver. But there were only a few big rivers, and there were more small ditches in front of the cavalry. The creek is not wide, just you can't jump over, and the creek is not deep, just over your head. Goxinga's mobile troops have been embarrassed by these small river ditches again and again.

If there is a folding bridge that is portable and can be quickly assembled, although Guoxinga can't cross the south of the Yangtze River, at least he won't look at the small river ditch and sing the rolling Yangtze River east. Although Yu Wendao's mortise and tenon joint bridge cannot be folded, it can be disassembled, and it is not difficult for one person to carry a piece of wood. Moreover, this thing is easy and fast to splic, and the missing parts can also be quickly replenished, which has extremely high military value.

Although some of Guo Xing'a only enter and can't leave, he is quite kind to Yu Wendao. Yu Wendao sent people to build bridges for Guoxing'a, and taught the sappers how to make parts and assemble them. Guo Xing'a also showed his sincerity, and the fragmentary rifles replaced by the infantry, Guo Xing'a directly gave them to Yu Wendao, and also asked the guard squad to help Yu Wendao train the musket team in Qiqiao Town.

Yu Wendao, who received a musket and received regular army training, also reciprocated. Brought more than 100 people to Guoxing'a, these people are all singles, their families have died in the war of the Taiping army, and they want to join Guoxing'a's troops to seek revenge from the Taiping army. Guoxing'a, who was short of manpower, naturally did not refuse, and secretly rejoiced in private.

The Qing army also has the blood of the people of Qiqiao Town, but it is a little less, the Taiping army has killed 1,000 people in Qiqiao Town, and the Qing army has killed less than 100 people. If the hatred is smaller, the natural treatment will be better.

"When we go, you can keep the five six-pounder cannons! Choose a few clever ones these days, go to the artillery side and learn how to use them! "Guo Xing'a on Xing's head waved his hand, and the six-pounder cannon sent you. Guoxinga also has generous capital, Xishou has already done it, and it has exceeded the target, and 14 Napoleon cannons have been cast. In order to test the artillery, Guo Xing'a also bombarded Huang Daping's camp at a large angle, not only did all the data of the artillery meet the standards, but also forced Huang Daping to retreat more than three miles.

Recruit training, new artillery debugging, tunnel excavation, the days just lived happily day by day, until half a month later, Guo Xing'a suddenly felt an earthquake, and then Fuquan stumbled in.

"My lord, Longhair has blown up the wall in the southwest corner!"