After creating incendiary bombs, Du He also improved some of Datang's attack equipment.

As usual, Du He didn't know anything about the production of attack equipment, but he was better than being well-informed, remembering the style of some siege equipment in the Song Dynasty, and he also had some advanced knowledge. In particular, the physics knowledge of rods, gears, and rollers, which I learned in junior high school and high school, unexpectedly worked wonders at such times.

Take the car crossbow as an example, the car crossbow is a collection of cars and crossbows, the flexible movement of the car and the large crossbow are gathered together, the bow and crossbow on the car are extremely large, and it takes more than 12 stones to pull the force, that is, about 1,400 catties of power. This bow is not even pulled by a monster-type character like Fang Yiai, so it is usually necessary to use this kind of bow and crossbow, and twenty-two people need to wait next to the bow and crossbow. Two people were responsible for loading the arrows, and the other twenty people were divided into five teams, taking turns to draw the bows, so as to be able to maintain the continuous surname of the bow and crossbow, and even more to use oxen and horses to pull, which was too wasteful of manpower and material resources.

According to this shortcoming, Du He used gears and rollers to create a simple thing similar to a jack crane using the principle of pulley, and now only one person can pull the bowstring, which greatly reduces the time and manpower wasted by pulling the string in the past, and enhances the rate of fire of the bow and crossbow from the side.

There are many similar reasons, and the world knows about these shortcomings, but they don't know how to solve them, and this happens to be where Duhe shines.

In the next half a month, Du He soaked in the Academy of Science and Technology and the Ordnance Supervisor, and found out some unique and impractical problems in all the siege equipment of Datang, solved them with the knowledge of later affairs, and improved them, greatly enhancing the power of these siege equipment.

As for the barracks, there are Luo Tong, Wang Dezheng and Liu Renliang there, so you don't have to worry too much, it's enough to ask at ordinary times.

It is worth mentioning that Liu Renliang, this guy is worthy of being the prime minister, he has not been in the army for a month, and he has already won unanimous praise from everyone in the army with his excellent strategy, and as a scribe, he has integrated into the military camp and become a part of the flying cavalry.

In this half a month, the war machine of the Tang Empire started quickly, and under a reasonable and orderly system, all the materials such as soldiers and horses, grain and grass, equipment, horses and so on were in place.

The words of the expedition are just around the corner, and Du He is also free. Use the rest of your time to spend with your family.

He accompanied Changle Weishui fishing, accompanied Li Xueyan to indulge in galloping on the wilderness, and played happily for two days.

On the last day before the expedition, he took Changle to the Cai Guogong Mansion, planning to use the remaining time to accompany his mother Zhang.

Zhang also understood Du He's filial piety, and his mother was very relieved. After Du Ruhui went down, he also joined in, and the family had a happy dinner.

That night, when Du He was about to go back to the Horse Mansion, he heard Du Ruhui say: "Erlang, come with your father, my father has a few words to say to you!" ”

In the eleventh year of Zhenguan, in mid-October!

On this day, it is the day when the army sets out.

Li Shimin, the king of the Tang Empire, ordered Hou Junji to be the general manager of the Jiaohe Road March, Xue Wanjun, the general of Zuotunwei, Jiang Xingben, the general of Zuotunwei, and the general Ashina Sheer as the general of the Jiaohe Road March, led 80,000 cavalry and 20,000 Turks and Qibi to conquer Gaochang, and also issued an edict to the world on the same day to discuss Gaochang.

The edict is written by the university scholar himself, sprinkled with more than 1,000 words, the writing is smooth, and the rhetoric is gorgeous. Not only did he go through more than ten major crimes such as robbing and killing business travelers in disguise as horse thieves, raising troops in vain, and plotting against him, but he also knew the benefits and harms to the people of Gaochang and let them abandon their weapons and surrender if they knew each other, and Datang would not be to blame for the past.

Of course, this is just to show the magnanimity of the Tang Dynasty, so I don't expect Gaochang King Lu Wentai to be frightened and surrender immediately.

Outside the Chengtian Gate, Li Shimin personally inspected the 100,000 troops on the expedition.

For this battle, Datang dispatched a full 100,000 troops, more than the soldiers and horses sent to resist Tubo, which shows how much importance Li Shimin attaches to this battle.

Under Li Shimin's impassioned speech, the 100,000-strong army marched to the west with the glory of the Tang Dynasty.

As he passed through the city gates, he met his family who saw him off.

There has been the first time, and this second time Zhang has been mentally prepared, and there is no sadness for the first time, but the ardent hope in his eyes for the safe return of his beloved son has increased unabated. Changle and Li Xueyan's thinking performance is also average. They didn't cry, they just smiled and sent him away, sincerely wishing him a triumphant return as soon as possible.

Du Ruhui said: "Erlang, remember what my father said last night!" ”

Du He nodded understandingly.

In the crowd, Du He also saw Wu Meiniang and beckoned to her just like he had gone on his first expedition. After getting her sweet smile back, the horse caught up with the group.

The 100,000 tiger and wolf divisions with first-class military efficiency spent half a month to come to Yumen Pass and settled here.

Hou Junji convened the first military meeting of the expedition to Gaochang in the Yumen Pass.

In the conference hall, all the generals gathered!

Hou Junji, Xue Wanjun, Jiang Xingben, Ashina Sheer and others are all there.

Hou Junji glanced at the generals in the hall, and when he landed on Du He, his eyes revealed a slight chill, and after looking around, he said: "They are all acquaintances, I won't say much about this polite word, I must have heard of General Du's Gaochang Wuli!" ”

The generals nodded one after another, Du He's Gaochang Wuli has long been spread and is no longer a secret.

Ashina Sheer said: "I have been to Gaochang and stayed there for several months, and the situation in Gaochang is as good as General Du said. ”

Hou Junji said: "I look at the first four categories of 'city, people, wealth, aid, and Tao', and I don't have to be afraid, but only 'Dao', which is a bit of a headache." This desert outside the Yumen Pass is extremely unfavorable for the army to move forward, after the desert, there are more than 400 miles from the Yiwu border to the Gaochang border, and it is also precipitous here. So, I think we should send an army as a vanguard army to open the way ahead, what do you think? ”

This is deep in foreign lands, and the vanguard army is indispensable, and no one disputes it.

Ashina Sheer stood up and said loudly: "General Hou, I am familiar with the terrain in Lower Ashina Sheer, and I am willing to be the pioneer position!" ”

Hou Junji frowned when he saw Ashina Sheer standing up, and he also knew that Ashina Sheer was originally the Khan of the Western Regions, occupying a large area of land in the Western Turks, and he was also a powerful man in the Western Regions. It was only because during the war with Xue Yantuo that the Western Turks copied their hometown, which led to the defeat of Xue Yantuo and the defeat of Gaochang State. He lived in Gaochang for several months, but feared Western Turkic persecution. As a result, Zhenguan led the people eastward in the ninth year, crossed the desert, attached to the Tang Dynasty, and became one of the famous foreign generals of the Tang Dynasty. It seems like two years have passed before and after, and he is the only one among them who personally leads the troops through the desert, and he is a well-deserved pioneer candidate.

"But ......" Hou Junji stopped his gaze on Du He slightly, but this was a little contrary to his thoughts, paused, and said: "General Ashina's is indeed the best candidate, but it will be of other use. ”

Ashina Sheer admired Hou Junji's military strategy and resourcefulness very much, and when he heard him say this, he also retreated.

Hou Junji looked at Du He.

Du He's expression moved slightly, remembering the situation when he met Du Ruhui alone last night.

Last night, Du He asked Du Ruhui to call him to the study, and saw Du Ruhui's expression of relief, but there were some complicated emotions in his eyes, he only thought that he was worried about his expedition, and smiled disapprovingly: "Don't worry, Daddy, the child has made a lot of progress in martial arts recently, not to mention the use of soldiers in planning but not in bravery, with my Datang's military strength, Gaochang is not vulnerable at all." The only thing to worry about is the Western Turks. Although the strength of the Western Turks is strong, my Tang Dynasty's tiger and wolf division is not weak! ”

"As a father, I'm not worried about Gaochang and Turkic ......" Du Ruhui heard Du He's words, his eyes were still complicated, and he said softly, and then said solemnly: "Erlang, be careful, Hou Junji!." ”

"What?" Du He's eyes widened in astonishment, and he was puzzled in his heart, Hou Junji is the commander of the three armies, be careful of him?

Du Ruhui ignored Du He's surprise and asked, "What does Erlang think of Hou Junji?" ”

"Wise and brave, brave and strategic, he is quite a remarkable character. However, the child felt that he was a little narrow-minded, and that he had a very high opinion of himself, and that he could not tolerate others, and even had a jealousy of the mentor who guided him in the march and battle. Du He, who said this, remembered the dissatisfaction Hou Junji showed when Li Shimin appointed Li Jing as the commander-in-chief when he decided to hold a military parade.

"Not bad! It's rare that Erlang also has such an ability to recognize people! Du Ruhui nodded in agreement with Du He's words, and said slowly: "A few months ago. Your Uncle Wei once strongly recommended Hou Junji as the prime minister, and at that time, His Majesty asked your uncle Fang, the eldest grandson, and his uncle to discuss this matter with his father. Uncle Changsun Guo didn't say anything, but his father and your uncle tried their best to stop it. Being a father is not ignorant of Hou Junji's talent. However, the prime minister, the head of the hundred officials, and the ruler of the hundred officials, can not be outstanding, but he must definitely have a mind and be able to accommodate his political enemies. Just like your father and your Uncle Wei, your Uncle Wei is stubborn, and we often disagree, and we often quarrel with him in the early years. But in private, our personal relationship is extremely deep. But Hou Junji can't do this, he has the temper of a general, the enemy is the enemy, and the enemy must be ruthlessly suppressed. Once he becomes a prime minister, he will inevitably launch a powerful blow to those who disagree with him. Over the years, my father and your uncle have controlled the government and tried their best to prevent similar situations from occurring, and under the leadership of His Majesty, the politics are clear, and there is no party or faction. If Hou Junji is a photo, I am afraid that it will be illuminated with unpredictable consequences. Therefore, for the father and your uncle, Hou Junji cannot be a match. Recently, it was said that his father noticed Hou Junji's abnormality in the court, and he was afraid that he already knew about his father to stop him from being a prime minister. Hou Junji couldn't help but be his father, but Erlang ......"

Du Ruhui's words were full of worry.

(To be continued)