After nearly a week of assembly and testing, Roland and Anna completed the development of the bomb touch fuse.

Compared with the muze of the shell, it is not required to withstand high temperature and high pressure, nor high G overload when it is discharged, so the structure is extremely simple.But it was such a thing of the bump and spring, the two also tested many times before they were successful.

The main problem is that no one knows how much elasticity the spring needs to be in order to not go through the fire when an accidental drop, and when the normal throw is thrown, it is necessary to ensure that the impact needle can stabilise the bottom fire.

He and Anna could only test a little by changing the thickness and hardness of the spring.

Fortunately, the latter and Lucia did a lot of up-front work on weekdays, so Roland has more and more high-quality materials available.Finally, the test is 1365 alloy steel, which has a high hardness and low toughness, and even if the bomb falls from a meter height, it will not be compressed to the end.

The appropriate spring was selected, and the rest was watered.Even if Roland has not seen the appearance of real fuses, he can design one by himself with its working principle.

The backwardness is definitely behind, but for the silly black and coarse missiles, it is enough to be useful.

The finished version of the touch fuse is like a cylinder, 12 centimeters long, about five centimeters in diameter, with threads underneath that can be screwed into the opening of the top of the bomb.

Its interior is a lower convex groov, and the needle is similar, which can be embedded in the groove.Under normal conditions, the upper part of it is placed on the top of the spring in the grooves, and the needle falls into the groove, just a finger away from the bottom fire.In order to be safe, Roland also opened a hole in the head of the needle, with a bolt to fix it on the shell, before the bomb must be pulled out of the iron rod, the needle can move up and down.

The mock test was conducted on a windy and sunny afternoon.

Since the bomb was nearly the weight of five nightingales after filling with sand and black gunpowder, Roland did not board the hot air balloon, but instead watched it with a lookout mirror three hundred meters away from the bomb disposal site.

In addition to him, the test shot was accompanied by the Iron Axe of the First Army command, and the chief knight Carter Lannis.

“Are you going to throw a giant dynamite bag into the palace with a hot air balloon?”After listening to Roland's battle plan, Carter couldn't believe his ears.Attacking from an altitude of two kilometers, ignoring the city walls and the defensive forces, completely subverted his previous concept of combat - of course, in the border town of this year, he has been subverted many times.

“As long as it is properly controlled, it is not impossible,” Roland nodded, “Tiffico is in the process of imposing a new militia, and if he cannot be stopped, the western border will inevitably be attacked by the drug army.”Even winning will not bring us any benefit.”

The letter sent by Tsesa shows that Taffico still wants to use the usual routine to consume his strength, and he does not know whether the messenger team sent by Barov can pull more people to the border town before the other party.

"If you can really throw the wrath of the thunder on the head of Tifeko's head, he will be overwhelmed!"The iron axe said excitedly, "This is an irresistible punishment!"

“I hope so,” Roland laughed.

Although Tasha mentioned in the letter that Taffico was likely to have figured out the formula for black gunpowder and opened a workshop in the inner city to try to mass produce this dangerous item, he considered it again and again and chose the target above the palace.

The reason is simple, because the palace is eye-catching enough.

From a height of two kilometers downwards, even the most magnificent city of Grey Fort is only half the size of a slap, so it is necessary to find a good landing point in advance when throwing bombs.The palace is in the middle of the inner city, surrounded by red tile walls, the top of the palace is laid pure white slate, in the fall process looks particularly eye-catching, it is almost impossible to identify the wrong target.

But the workshop is different.

He did not have the plan of the royal capital, and no one on the ground was guided, and it was difficult to describe the location of the target in terms of language alone.Coupled with the small area of the workshop itself, once the bomb fell into the residence, the plan did not pay.

Suddenly, a white shadow fell directly to the ground, so that a smoke column was raised in the test site, and the dull sound of landing came later.

"It seems that the bomb has landed," Roland said, putting away his lookout, "and look at the results."

After a week of training, the lightning bomb-throwing technique has made great progress, the projectile landed less than five meters from the target center, the whole body fell into the soil, the shell was greatly deformed under the impact.

When the remote number landed, Anna cut the bomb with a black fire, and everyone saw that the soil near the fuse had become a clump of black - which proved that the high-temperature gas of the bottom fire ignited the black gunpowder scattered on the surface of the soil, and the fuse itself was working normally.If the inside of the body is filled with nitrified starch, it can easily create a deep pit of four to six meters, and kill unobstructed personnel within a range of 50 meters.

Since the development of the air warp is completed, the next step is to arrange the battle plan.

Roland's eyes swept through the crowd in turn, slowly opening the mouth, "The surprise king's plan is scheduled to be implemented next Monday."First, the iron axe, led by a team of fifty muskets, to escort the witch to the outskirts of Yingguang.There is a ridge there that can block the view, whether it is a camp or a balloon.

“Follow me, Your Majesty!”The iron axe.

“Don’t we fly straight from the border town?”Wendy asked.

"No, it's too far away," Roland shook his head, and it would take at least a week to travel from the west to the king, and it would take about three days to fly straight from the distance, and it would take six days to return.After the hanging basket was equipped with the throwing frame, it could only carry two people, the nightingue could not go with them, and the four witches, except for Anna, did not have the ability to fight, and the risk of spending six nights in the field was too high, and he could not be assured.“If you leave Yingguang City, you will be able to shoot in just one day and return before the sun sets.”

“Next are the Witches, and the mission is Anna, Wendy, Lightning, Maisie, Nightingale, and Hilway.The latter two are responsible for monitoring the situation around the camp, and the attack is carried out by the first four people according to the training method, especially the lightning, "he looked at the little girl, "whether it can be successful depends on you."

“Leave it to me.”The latter patted the chest.

"Then the last thing I want to say is to be careful," said Roland, "and I'll wait for you to come back in the border town."

Four days later, the first bomb, Dongfeng 1, was loaded by a carriage and boarded a cargo ship bound for Yingguang City, escorted by the 1st Army.(Unfinished.