"Although this method is the most ideal, but if it continues like this, we will form a habit and rely on this method......" Liu Tao shook his head, this method is indeed very convenient.

It's just that this convenient method is for the 'courtiers'. If he only plans to play this trick, then it is good to be a 'loyal minister of the Han Dynasty', and there is no need to reformulate the rules.

If he could, he hoped not to use this method as much as possible, so as not to end up trapping himself in.

After a pause, he looked at the bucket of ice and continued: "Besides, the size of this bucket will probably consume about four taels of saltpeter. The ice produced is enough for about five people at most, and it takes a quarter or two of ...... With 20,000 troops, no amount of saltpeter is enough. ”

"This is also ......" Lu Yan nodded, indeed he did not consider the cost issue.

The main thing is the method of condensing water into ice, which is really surprising, and it feels like the method of seizing heaven and earth. The moment he saw it, he was thinking, if he used it properly, he might be able to give Liu Tao a wave of prestige.

The key is to be able to help his father, Zuo Feng came to inspect it very strangely, after all, Huangfu Song and Zhu Jun did not have the appearance of the Yellow Gate in the past. This time Zuo Feng was sent away, and it is difficult to say whether someone else will come to inspect next time.

Only by knocking down Guangzong is the key to finally solving the problem.

"Actually, there's a better solution...... Liu Tao pointed to the bucket of ice, "Wouldn't it be nice to leave it to the teacher to judge?" ”

"Hah, I didn't even think about it." Lu Yan was also stunned when he heard this.

As the so-called blind eye, Lu Yan set off on Liu Tao's side, but ignored Lu Zhi's ability and his identity.

A few minutes later, the ice bucket was delivered to Lu Zhi, who looked at the bucket of ice and looked at the two of them in disbelief.

He could see that this bucket of ice should not have been put in outside and brought here, otherwise it would have melted long ago. The key is that they are besieging Guangzong City at the moment, and there are all wilderness around it, where did the ice come from?

"Where...... ...... coming" Lu Zhi couldn't speak, and at this moment his mind was full of the two sentences of 'silent and strange and confused' and 'respecting ghosts and gods and staying away'.

"It's made with some saltpeter in the water." Liu Tao stepped forward, "The disciple heard a magician say by chance that the weather has been too hot recently, and he happened to be free, so he asked Cangshan to help bring some saltpeter back to try." ”

"Adding saltpeter to water can make water condense into ice?" Lu Zhi was stunned for a moment, but he was calmer in the end. It doesn't matter if it's unbelievable, as long as it's not related to gods and ghosts.

"Visually, four taels, or even three taels of saltpeter, can almost condense this bucket of water into ice. In addition, if the water is dried or boiled in a clay pot, saltpeter can still be obtained, which means that it can be reused. Liu Tao replied.

"It's just that saltpeter is used relatively little, and the soldiers I sent only found half a catty in Quzhou County." Lu Yan stepped forward, "Of course, if you check carefully, you may be able to find more ......."

If a county only has half a catty, or even a catty, the effect is not great. Lu Zhi looked at the bucket of ice and felt a little regretful.

If he could have thousands of barrels of such ice, then he could immediately ask the troops to attack, not to mention that in this kind of hot day, he could maintain at least half an hour or so of combat strength.

"Slow ......down," Lu Zhi thought for a while, "If you don't need to freeze, you only need to lower the water temperature to the point where it freezes quickly, how much saltpeter will you need?" ”

"About six dollars, I think it's actually enough." Liu Tao thought for a while, "How much saltpeter and water are needed to reduce the temperature, this can only be explored little by little." ”

"One last question." Lu Zhi looked at the bucket of ice, "Can you drink the water that you put in saltpeter?" ”

"I haven't asked the doctor yet, but it should be fine, but the taste will be slightly bitter, and it is not suitable for drinking in large quantities." Liu Tao replied, in his opinion, it is estimated that the doctor and craftsman don't know whether this thing can be drunk or not, and how many problems there are.

"Then go to the doctor and ask, I need to know the accurate information, this can't be any sloppiness." Lu Zhi ordered, and those who were familiar with him could hear that his current tone was a little excited.

"Teacher, it won't be that you plan to let the soldiers all carry a water bladder......" Liu Tao probably knew Lu Zhi's plan.

"If it's ice water, it can at least last for a while, and the key is that it won't frostbite. Ice water is a bit more useful than ice cubes. Besides, if you don't attack all the time, maybe the next Yellow Gate is coming. Lu Zhi sighed.

Sure enough, Lu Zhi was also worried about this issue. Don't look at Zuo Feng who has only been here for a day and a night, some of the information that should be revealed was still noticed by him. Your Majesty, sure enough, I feel a little heartbroken about the grain and grass spent on the inside.

At this time, Lu Zhi remembered that His Majesty Dahan, the importance of money seemed to be stronger than imagined.

The key is that the siege equipment has also been built, but due to weather problems, it has not been put into use.

"Mentor ......" Liu Tao immediately said when he heard this, "If it is a general attack, can the troops under my command be allowed to participate in the battle in the city?" Although I know that this has some impact on the distribution of military merits, the key is to conquer Guangzong as soon as possible. ”

"Indeed, at the critical moment, you can't be too particular." Lu Zhi hesitated for a moment when he heard this, and finally nodded in agreement.

Liu Tao and the others went all the way down, and their exploits were too dazzling. If even Guangzong was defeated by them, or if they took the main credit, the captains below would probably have some opinions.

The Han court was very strict with the promotion of the border army, and it was difficult for those who did not make meritorious contributions to be promoted. However, in recent decades, the captains of the northern and southern armies have gradually become a place for the children of the family to gild. Mixing in officialdom, eating yourself and ignoring others, but it's not okay.

Liu Tao and Lu Yan left, and Lu Zhi had already ordered the soldiers to dig a pool next to the Qinghe. This is obviously faster than a wooden barrel. The disadvantage of saltpeter is not easy to recover, but as long as the First World War can pacify Guangzong, it is not a big problem.

"I feel that this time, on the contrary, I owe Deran a little bit......" Lu Zhi sighed, back then, he accepted them as apprentices, mainly because of his fellow villagers, but he really had no choice but to accept them.

I didn't expect that a few years later, Liu Tao would be able to grow to this point, which is really unpredictable.

"I didn't expect it to be ice water...... Lu Yan felt that he was too stupid before, and he didn't expect ice water at all.

"It's true that if you carry ice cubes, you will frostbite your skin if you carry them close to your body, but it is not as good as ice water. It's just that on this kind of hot day, it is estimated that the ice water will soon fail, and the soldiers will have to adapt to the weather again, and the weather will feel hotter than the original during this period. Liu Tao shook his head, he had actually thought about the problem of ice water.

Just like people who enter an air-conditioned room outside for a period of time and then go out, the temperature outside is said to have not changed, but the temperature still feels like the temperature outside seems to have risen by several degrees......

Come to think of it, at that time, the soldiers should be more difficult.

However, he did ignore one point, that is, the thieves of the enemy army were in the same environment as them. And these thieves, the ability to endure the heat, should be much worse than that of regular soldiers.