Luo Yu's arrival made Jiang Xingchen sigh, this guy came at a really good time, as if he was pinching a little, and he arrived as soon as he was busy.

Jiang Xingchen also guessed a few points about Luo Yu's intention, and couldn't help but feel a little embarrassed. The Orc Alliance must have taken a fancy to the ballista, and Luo Yu must have been politely rejected by the military department, so he ran to himself again...... However, he has already handed in the drawings, and such a weapon definitely belongs to the core of the country, even if the Orc Alliance is an imperial ally, it can't be given.

"Brother, I will rely on you this time, if I can't complete the task, brother, I will be miserable when I go back, and the identity of the heir of the golden lion will be taken down!" As soon as they met, Luo Yu hugged Jiang Xingchen, and his voice was full of tears.

The corners of Jiang Xingchen's mouth twitched, this guy didn't talk about the Orc Alliance, but he talked about his own business, and he looked like a brother was in trouble, he was too shrewd. However, his tone was like crying, and he still sounded a little proud.

"Young patriarch, if you say anything directly, you don't need to be so close, we don't know each other very well!" Jiang Xingchen broke away from Luo Yu's embrace, took two steps back, and said quietly.

"Uh!" Luo Yu was stupid, stared at Jiang Xingchen for a long time, and suddenly wailed: "I'm Ciao, do you have such a brother, it's too much fun!"

Jiang Xingchen's expression changed suddenly, and he smiled: "Who the hell let you fool me, it's obviously a matter of the Orc Alliance, you have to talk about the relationship between friends!"

Luo Yu looked straight again, looked at Jiang Xingchen stunned for a long time, and suddenly laughed: "Brother." I know that you are a friend enough, and you won't look at my brother in trouble!"

As he spoke, Luo Yu strode forward. I'm going to hug Jiang Xingchen.

"Don't come to this set!" Jiang Xingchen hurriedly stepped back again, stretching out his hand to block Luo Yu: "Tell you, don't think about the design of the ballista, if I give it to you, the marshal and the emperor can beat me out!"

Luo Yu stopped and said loudly: "Brother, what the hell do you mean." In the end, can I help you give a quasi-word...... We are an alliance, do you think that now that we have a sharp weapon like a ballista, we orcs will not be needed! If we can't stop the ironclad chariot of Xuanyuan Tianzong. Do you think you can resist the Xuanyuan Heavenly Sect alone?"

Jiang Xingchen shook his head and said, "Young Patriarch, that's what you said when you negotiated with the military department...... What did the military department say to you?"

Luo Yu's momentum just now weakened suddenly. Exhale slowly. With a bitter face, he said: "The military department said that it would send us a ballista unit to help defend Xuanyuan Tianzong!"

"That's it, why do you have to get a ballista!" Jiang Xingchen stepped forward, patted Luo Yu lightly on the shoulder, and dragged him into the lord's mansion.

Luo Yu was silent until he sat down on the chair before he whispered: "You have ballistas, and Xuanyuan Tianzong has ironclad chariots." You should understand what our Orc Alliance is worried about!"

Jiang Xingchen smiled and pushed the teacup on the table to Luo Yu. He said softly, "You just heard that the ballista is powerful, but do you know how powerful the ballista is?"

"I never thought that the opponent's chariot could be broken from a distance of three hundred meters!"

Jiang Xingchen said lightly: "In fact, the power of the ballista depends on the impact force, but the movement itself is a big problem, that is, the lack of flexibility, you should have analyzed this, your cavalry is enough to restrain the ballista!"

In the previous life, the ballista was used in large quantities by the ancient Romans, and it was able to blow off the heads of enemy soldiers 200 meters away! In this world, the ballista designed by Jiang Xingchen was more reasonable in structure due to the different materials and the grasp of the composite force array, and the charging force of the torsion spring was greater and the impact force was stronger.

But the corresponding problem is not small, too cumbersome makes the ballista seriously inflexible, more suitable for defense, such a terrain as the prairie, a large number of light cavalry scattered, rapid siege, absolutely can restrain the ballista to death.

Luo Yu said: "We know this, but what about the ironclad chariot, there is no way for that thing cavalry!"

"Who said it can't be helped, your cavalry is fast, light and flexible, and it is easy to outflank quickly! As long as you close the distance and engage the opponent, their chariots will have no place to use!"

Luo Yu frowned when he heard this, and a strange expression appeared on his face: "Brother, are you joking with me again, the two sides are fighting, and the power of our riding and shooting is gone!"

Jiang Xingchen smiled and said, "Don't worry, I'll give you a good thing when I go back, it's suitable for close-range grappling, and you can definitely fight the other party so that you can't find the north!"

"Oh?" Luo Yu's eyes suddenly lit up, and he asked urgently, "What kind of good thing is it?"

"Hehe, don't worry, you came all the way from afar, you haven't eaten yet! Let's eat first!" Jiang Xingchen said with a smile.

"Okay! I didn't think just now, I was hungry when you said this!" Luo Yu immediately stood up.

Jiang Xingchen looked at Luo Yu's appearance, the corners of his mouth twitched, he originally wanted to hang this guy's appetite, but he didn't expect this thing to be off the donkey.

"What a foodie, eating is more important to him than his task! This guy was crying and shouting for me to help him just now......" Jiang Xingchen was really speechless.

Luo Yu looked at Jiang Xingchen's expression, and let out a hehehe sneer in his heart: "You said that there is a way, I'm still in a hurry......"

At dinner, Zhao Danqing also came back from Xinzhen's work, and the two foodies met together, and the battle situation at the dinner table can be imagined. The little girl Nier who ran over to rub the rice was so aggrieved that she pouted her lips, she didn't eat a few bites at all, and the meal was snatched up by two foodies. The last thing is that the kitten woman goes crazy, and the two have to stop, they are both afraid of bees.

After dinner, Luo Yu couldn't wait to drag Jiang Xingchen aside and asked what he had prepared.

Jiang Xingchen didn't hang Luo Yu anymore, and said in a low voice: "Crossbow!"

The crossbow, also known as the crossbow, is easy to fall because the crossbow arrow is short and thick, and the center of mass is in the front section of the crossbow arrow, so the range is closer than the bow, the penetration is not strong, and even the reloading time is longer than the bow.

However, when it comes to close-quarters grappling, the crossbow is more lethal than the bow. The main thing is that the crossbow is relatively stable, does not require strong arm support, is easy to aim, and has a higher hit rate. Another thing is that this thing is easy to learn.

In the last life, Jiang Xingchen liked the big black eagle used by Xu Zheng very much after seeing the crazy stone in the movie. I checked it on the Internet, and I once saw the introduction of the cross crossbow, and I also saw the design drawings of the cross crossbow. Although his memory is a little blurry now, with the help of the composite force array, he still thinks that he can recover it.

"Crossbow, what is that?" Luo Yu asked strangely.

"This ...... It's hard to explain now, I also need to think about it, you wait for me for two days first!" Jiang Xingchen said.

"Okay, brother, as soon as possible, who knows when Xuanyuan Tianzong will attack, if it's too late......"

"I know this!" Jiang Xingchen hurriedly stopped Luo Yu, who was chattering.

In the following two days, Jiang Xingchen began to study the crossbow. The material is still hardwood, which is not only hard, but also tough, and it is no problem to make a ballista body, and it is definitely okay to use it as a crossbow.

Crossbow machine, crossbow arm, bowstring...... While studying, Jiang Xingchen used the composite force array to judge its force, analyzed the bearing capacity of each component and the direction of the force, and improved and changed the drawings little by little.

With the experience of manufacturing large ballistas, and the vague impression of the parts in his mind, Jiang Xingchen's progress is very fast.

In the evening of the next day, Jiang Xingchen exhaled a long breath and handed over two pieces of white silk and a light crossbow to Luo Yu's hands.

"Is this a crossbow?" Luo Yu looked at the strangely shaped thing in his hand and asked, "How do you use this thing?"

Jiang Xingchen shook his head with a wry smile, secretly sighing that he was really a suffering life, even if he helped him design it, he had to be responsible for the use of the church.

Fortunately, the operation of the crossbow is not complicated, load the crossbow arrow, press the trigger, and the crossbow arrow will be fired.

Luo Yu looked at the position where the crossbow arrow hit, was stunned for a long time, looked at Jiang Xingchen pitifully, and said: "Brother, you fool me again, this crossbow is not very powerful, it is estimated that it can shoot through leather armor......."

Jiang Xingchen glared and said, "I told you a long time ago, this thing is suitable for close-range grappling, and its power is not as great as that of bows and arrows, but at close range, it is definitely easier to use than bows and arrows, and its lethality is stronger than that of bows and arrows!"

"Brother, don't play, can't you, other people's ironclad chariots can't even shoot through bows and arrows, no matter how close you are, the crossbow can't break the defense!"

Jiang Xingchen was really speechless, if he couldn't beat it, he wanted to slap this product.

"Close combat, who the hell let you shoot the chariot! Shoot the man first and shoot the horse first, capture the thief and capture the king first, do you understand...... Their ironclad chariots are already bulky, and the horses that pull them will definitely not be equipped with heavy armor, otherwise they won't be able to run!"

"Oh~" Luo Yu suddenly realized, his eyes lit up, and he nodded frequently.

"Brother, thank you so much! Don't worry, I won't let you suffer in vain, we will spend money to buy this thing!" Luo Yu smiled and hugged Jiang Xingchen's shoulder and patted it a few times.

Jiang Xingchen grinned, broke free from Luo Yu, and said solemnly: "You can keep this design drawing......

"Hehe!" Luo Yu smiled, and without waiting for Jiang Xingchen to finish speaking, he hurriedly said: "I understand, we will keep this matter absolutely secret, and we will not let the empire know about it...... However, the Orc Alliance will never treat friends badly, and if you can't give money directly, you will be made up from other places!"

After speaking, Luo Yu waved his hand and said: "I'll go back first, you won't participate in the Xinzhen celebration, and the congratulatory gift will be given to you to make up for it!"

As he spoke, Luo Yu's face sank suddenly, and he put on an extremely unhappy look, kicked open the door of the lord's mansion, and strode away angrily.

Jiang Xingchen raised his hand and muttered depressedly, "Hey! I didn't mean that...... You think that with this way, I will be able to get rid of suspicion, as long as you use it on the battlefield, the marshal will definitely suspect me...... You might as well go with a smile, anyway, the crossbow is not very powerful, and I have something to say!" (To be continued......)

PS: Garlic continues to spell the third chapter! Before 10 o'clock in the evening!