Pu Song said: "Our Pu family was originally a wrought iron family in Linqiong County, just because I was willful when I was young and liked to make friends with rangers, so I decided to go out and explore the rivers and lakes." My brother inherited the family business, and I traveled to various places to find local wrought iron masters to exchange ideas with them, and over the years I came up with a set of methods for making steel and quenching. When I wandered to Hanoi, I was penniless, so I opened a blacksmith shop. I saw that the business was good, so I settled in Wude County. When my brother died of illness, he entrusted Pu Yuan to me on his deathbed, and I took him back to Hanoi. ”

Pu Yuan's talent was appreciated by Liu Bei, Zhuge Liang, and Jiang Wei in history, and he participated in major projects such as weapon forging and wooden oxen and horse manufacturing in Shu many times. Pu Yuan was able to fight with the army again, and Jiang Wei also wrote a biography specifically for him.

Pu Yuan made 3,000 knives for Zhuge Liang in the sloping valley. The knife he made can split a bamboo tube filled with iron beads, and is known as a magic knife. The main know-how of Pu Yuan's knife making is to master the exquisite steel knife quenching technique. He was able to distinguish the influence of different water quality on the quenching quality, and selected Shujiang water with a large cooling rate to quench the steel knife to the appropriate hardness.

He believes that "Shujiang is refreshing" and is suitable for quenching, while "Han water is blunt and weak" and cannot be used for quenching, and Fushui is not usable. He made a knife for Zhuge Liang at the mouth of the sloping valley, and specially sent soldiers to CD to fetch river water. Due to the rugged and bumpy mountain road, more than half of the river water was overturned, and the soldiers mixed in some living water. After the water arrived, it was immediately recognized by Pu Yuan, so everyone was shocked by Pu Yuan's magical method of distinguishing water.

1,700 years ago, Pu Yuan discovered that the quality of water affects the effect of quenching, which is a remarkable achievement. In Europe, however, it was only in modern times that this question began to be studied.

Moreover, Pu Yuan is likely to have mastered the method of frying steel at that time, and now Pu Yuan is still young. I don't know if Pu Song mastered the method of frying steel and passed it on to Pu Yuan, in short, what Han Xuan can do now is to support them like uncles and nephews.

Han Xuan asked, "Where is that nephew Pu Yuan now?" ”

Pu Yuan replied: "He is still in Hanoi, and I will hand him over to Humble Jing to raise before leaving." ”

Han Xuan said to him: "I was about to send someone to reply to my mother and brother, and I asked my eldest brother to send soldiers to escort my nephew and Mrs. Zun's family to Changsha?" So that they can be reunited with you. ”

Pu Song had no choice but to agree, and Han Xuan said again: "You must teach him your method of forging iron, I dare to guarantee that he will be better than blue in the future." You're here at the right time, I'm about to build a crossbow bolt, I want to build a three-edged cluster of arrows, do you think you can lead the guys to build it? ”

Pu Song patted his chest and said that it was no problem, and Han Xuan introduced Pu Song to Huang Ergou and asked them to develop a three-edged barbed arrow. This type of arrow is more aerodynamic and more lethal than the crossbow arrows of the two-winged arrow cluster. Huang Ergou had already developed a short crossbow suitable for the Shadow Tiger Army's surprise attack, and he only waited for the crossbow arrow to be developed, and then handed it over. Han Xuan was ready to let Pu Song make a hundred short steel knives to equip the Shadow Tiger Army. In this way, the combat power of this special forces can really reach a higher level.

After Han Xuan arranged many things, he was idle. He went to Su Qiao'er to accompany Su Qiao'er and told her about the letter from his mother and eldest brother. Han Xuan was going to wait for Su Qiao'er to keep filial piety for three years, and then go back with her to visit them. When Su Qiao'er heard this, she remembered that her relatives had passed away now, and she was very envious that Han Xuan had relatives who cared about him. She thought of Su Lie Su Zhong again, and couldn't help but cry like rain.

Su Qiao'er seemed to remember something, wiped her tears and said, "I remember, Ah Weng taught me a mantra before his death, and he told me not to tell others easily.

Dry clouds, hold the fog and clouds.

The ghost valley is vertical and horizontal, and there are 100 steps in all directions.

Changhong runs through the sun, twists and turns.

Pick up the clogs, Huang Gong got off the bridge. ”

Han Xuan carefully looked at this mantra, and recited it repeatedly in his mouth: "Guigu, Huang Gong, is it related to the "Taigong Art of War"? ”

Han Xuan thought for a long time and couldn't think of what this mantra left by Su Lie wanted to express, he suddenly thought that this mantra didn't rhyme, could it be a Tibetan poem?

Su Qiao'er looked at him anxiously and comforted: "Xuan, don't worry, you can write it down and think slowly." ”

Han Xuan neatly wrote down this mantra on silk and looked at it carefully. The whole mantra, each sentence has a story corresponding to the Guigu Zongheng family and the soldiers, which must be related to the art of war. The first two sentences have the word "Ling" and the word "fog", indicating that it is in Lingwu Village. As for the second sentence, he should have wanted to express a distance, eight hundred steps. The last two sentences, Han Xuan didn't expect to break his head, and wrote repeatedly. In the end, he wrote the words "long", "three", "wooden" and "gong" on the silk, and when combined, it turned out to be the traditional character "pine".

Han Xuan put it together and read: "Lingwu eight hundred steps down." The rainbow runs through the sun, and it must be facing the direction of the sun. Yes, it must be under the pine tree at Uncle Su's house in Lingwu Village eight hundred steps to the east! ”

Han Xuan was pleasantly surprised to take Cao Xing and a few of his entourages and ran to Lingwu Village, and after walking eight hundred steps, he saw a tall pine tree. Han Xuan asked Cao Xuan to take a few followers to wave their hoes and start digging around the tree, digging more than half a meter deep, and finally saw a copper box.

I saw that there was a copper lock hanging on the copper box, and Han Xuan was slashing and burning with a knife, but he couldn't open it. Han Xuan took the copper box and went back to find Su Qiao'er.

Su Qiao'er looked at the lock of the copper box, and felt very familiar, she took a key from her neck and inserted it into the copper lock, only to hear a "click", and the copper lock was opened.

Han Xuan excitedly watched Su Qiao'er open the copper box, only to see a book and a silk book inside.

Han Xuan opened the book and saw that the words on it were all small seals. Han Xuan had consulted a large number of seal books in order to check the information of the Heavenly Tribulation Gate, and he knew a lot about Xiao Seal. The three words at the beginning of this book are exactly "The Book of Machines"!

Han Xuan wondered: "Shouldn't it be the "Taigong Art of War", why is it the "How-to Sutra"?" ”

Han Xuan continued to read, and he was unconsciously attracted by the contents of the scriptures.

Eight formations, four for the positive, four for the odd, the rest of the odd for the odd. Or in general.

The first outing army is set at both ends, the sky has a balance circle, the earth has an axis, there is a rush before and after, the wind is attached to the sky, and the clouds are attached to the ground. There are four teams in each rush, and three teams in the front and back. The wind lives in four dimensions, so it is round. There are three teams in each row of the axes, and three teams in the front and back. The clouds dwell in the four corners, so they are square. The heavens dwell at both ends, and the earth dwells in the middle, and there are always eight arrays.

In the battle, the guerrilla army stepped on the enemy from behind, or shocked its left or right, and listened to the sound and looked at the command, so as to make four surprises. Heaven and earth rushed to the tiger's wings, the wind was the snake, and the righteousness around it was also: the tiger lived in the middle, and the wings were opened; The serpent dwells at both ends and responds to the enemy. After heaven and earth, rush for the flying dragon, the cloud for the bird, and the righteousness of the assault: the dragon dwells in it, and the wings are opened; The birds tucked at both ends and flew towards the enemy in response.

The second base of virtual and real is based on astronomical climate, back to the mountains and rivers, and at any time, with the right coincidence, and the odd victory. Below heaven and earth, eightfold columns. Or say: grasp the opportunity to look at the enemy, that is, lead the behind, and do not move in the front with the angle, and the front is advanced and secondary. Or they become one, and they are eight because of their separation, and each grows according to the number of teachers.

The sky is round and does not move, the front is left, the back is right, and the four eyes of heaven and earth are also. The heavens dwell at both ends, followed by the wind, followed by the clouds, and the left and right are also facing each other. The place is clothed, the wind and clouds are rushing forward and backward before, the sky is at both ends, and the second place is in the middle, and the two places are also compared to each other.

Vertical distribution of the first day, the second day of the day; longitudinal distribution of the fourth earth, second to the queen of heaven; The four winds are spread vertically, and the left and right of heaven and earth are carried around. Heaven and earth are on the right side of the front rush, the back is on the left, and the clouds are at both ends. Virtual and real second base, this is also.