Chapter 126 The Moon of Yesteryear
"I think so too. It's probably because they were attacked by the First Division and were motivated by revenge that the Japanese launched a surprise attack."
Zhao Le wasn't very clear about the situation outside. She followed the orders from above, occasionally going out with the medical team to provide support. Most of the time, she stayed in the hospital to perform surgery on the wounded brought down from the front lines. Of course, she also had to squeeze out time to go to the countryside with the comrades from the Women's Salvation Association.
Xie Ning, however, flipped through her notebook, which contained many maps that she had collected and drawn through various means.
Then, pointing to an area in Hebei Province, he said, "The reason should be more than just retaliation. This area originally belonged to the Japanese Combined Forces Division, but was later incorporated into the Japanese Independent Brigade in Zhangjiakou. The First Division stationed here will obviously affect the rotation of the two Japanese forces."
And just then, several days of heavy rain caused the river to swell, which made the surprise attack possible. It was a diversionary tactic, because if the regiment that attacked Songshan attacked, the 3rd Regiment stationed in Yinfang would inevitably go to its aid, and then... the Japanese army successfully completed the troop rotation, while the remaining personnel of the 3rd Regiment stationed in Yinfang were wiped out.
"Wow! Those Japanese devils are really cunning!"
Dani was furious. So many of them had died. In that battle, she had been shot in the stomach. She was injured on the way to deliver intelligence to headquarters. The Japanese had blocked the railway, so it was impossible to get through. She was brought over by a fellow villager who found a shortcut. She almost died on the way.
"But, Sister Changning, how do you know all this so clearly?"
Xie Ning remained silent. Although she hadn't been feeling well recently, she hadn't missed a single meeting, so she naturally had a clear understanding of the battle situation in various regions.
——
In the afternoon, Xie Ning packed up her lecture notes and went to class. The cultivation of technical talents is a long and arduous task.
We happened to be talking about the Japanese army's training in assault boat raids today. During the battle, some soldiers threw bombs into the water and injured many Japanese soldiers. So, Xie Ning simply explained the principles of bomb making in class.
The bombs manufactured by the arsenal were mostly simple, some so simple that each unit could assemble them themselves. These were known as homemade bombs. Xie Ning had compiled and improved upon all the homemade bombs made by civilians and then assigned tasks to soldiers in various units to learn how to use them.
"Today we're going to talk about homemade bombs."
Xie Ning pointed to the simplified diagram in the handout, "...Use iron sheets to make the explosive cartridge and outer shell, fill the explosive cartridge with explosives, and then you can stuff cast iron sheets between the cartridge and the outer shell. If you don't have cast iron sheets, you can stuff them with glass shards. If you don't even have glass shards, chili powder or small stones will also work."
Use whatever materials are available, since the principle of bomb explosion is the same. The damage is nothing more than shock waves and shrapnel. Moreover, the damage caused by putting different items between the explosive cartridge and the outer shell is also different. Stuffing iron pieces with them is more lethal, and more so than ordinary grenades and hand grenades.
If made larger, it can destroy enemy military vehicles. If stuffed with chili powder, it can be used indoors, providing a stronger irritant effect and causing more damage than if used outdoors.
...Then we'll talk about the difference between bombs exploding in air and in water...Water has 800 times greater resistance than air, so the damage from shrapnel is reduced in water. For example, shrapnel that can travel 10 meters in air may not even travel 1 meter in water due to the resistance.
However, water differs from air in that it is incompressible. This means that the shockwave from a bomb explosion will exert the same pressure on water, causing it to spread rapidly over a distance far greater than the distance a bomb would travel in air... We must remember that the human body, like air, is compressible...
In summary, the shock wave generated by an explosion will have explosive power if it is in a suitable medium, and water is an excellent medium, with a conductivity far greater than that of air.
Xie Ning then answered several questions from the trainees and then went on to elaborate on the topic.
"If you didn't quite understand this lesson, I'll make a small project next class to explain the transmission of force in more detail. Liu Yun, collect your feedback. Class dismissed."
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