Everyone was confused, puzzled.

Yang Hu said: "Brother-in-law, this is just a few peach blossoms, what can it be used for?" ”

Cao Liang smiled, pulled the flower off the soldier's head, stretched it out in front of Yanghu, let him take a closer look, and asked, "Uncle, have you ever seen a peach blossom with bamboo leaves?" ”

Yanghu is a northerner, he has only seen ordinary peach blossoms, he has never seen this kind of peach blossoms with bamboo leaves, Yanghu suddenly became curious, and stretched out his hand to take a closer look.

Cao Liang didn't hand it to him, but shrank back and said, "Be careful, this flower is poisonous!" ”

Yanghu couldn't help but be stunned, peach blossoms were poisonous, he was really unheard of, and said: "Impossible, this flower is actually poisonous?" ”

Cao Liang called the soldier who picked the flowers over and asked, "Do you feel anything on your arm?" ”

The soldier stretched out his hand, and it was already obvious that his hand was already red and swollen, and he said, "It's numb and itchy." ”

Cao Liang said to everyone: "This flower is called oleander, oleander is so the name suggests, fake bamboo peach, its leaves are like bamboo, its flowers are like peaches, and it is not bamboo or peach, so it is called this name." Oleander is a highly poisonous plant, and he accidentally got the juice of the flower on his hand when he picked it just now, so it was red, swollen and itchy, which is a manifestation of poisoning. If someone mistakenly ingested the flowers and leaves, just these few pieces would be fatal. ”

In his previous life, Cao Liang had seen this kind of plant, the petals were like peach blossoms, and the leaves were like bamboo, which was very recognizable, because this kind of flower only grows in the south, so they didn't know Yanghu, and naturally they didn't know the attributes of flowers.

Oleander is a poisonous plant, the whole plant including its sap is toxic, and its toxicity is extremely high, eating a few pieces of flowers and leaves by mistake can cause death, at the same time, the medicinal value of oleander is also extremely high, made into medicinal materials can cure many kinds of diseases.

Listening to Cao Liang's words, everyone suddenly realized, it turned out that this seemingly delicate flower like a peach blossom can actually kill a person, the soldier was secretly afraid, fortunately he just picked a flower, if he was stained with the juice of this oleander, maybe he would die.

Du Yu said suspiciously: "I just listened to what Captain Cao said, it seems that there is a good plan to break the city, is it because of this thing?" ”

Cao Liang smiled slightly: "That's what I mean." ”

Du Yu said puzzledly: "Although this thing is poisonous, it seems that only if you take it can you kill people, so what is the way for Captain Cao to let the Shu people come to eat this thing?" ”

Cao Liang said with a smile: "You don't need to eat it, oleander is very toxic, and the smoke produced after ignition is also highly toxic, at this time the west wind is tight, you can ignite this thing in large quantities at the upwind outlet, the inner city of Jinwei is only a little place the size of a palm, as long as the poisonous smoke is shrouded in the city, see how can he Liu Yin resist?" ”

When Du heard this, he exclaimed repeatedly: "High moves, Captain Cao is really good moves!" ”

As early as the Spring and Autumn Period and the Warring States Period, this kind of "biological and chemical weapons" have appeared on the battlefield, but the conditions for use are more harsh and cannot be widely used, so the use of poisonous smoke and poisonous fog is not the mainstream of war, it can only be regarded as an auxiliary means.

First of all, the use of toxic smoke must have the right wind direction and wind force, the wind direction is not right, the poison is not the enemy but their own side, the wind must also be appropriate, not too big, not too small, too big the wind will soon be blown away, the wind is too small and can not blow through, so the use of toxic smoke is very demanding for the wind.

The second is the enemy's position, if the enemy is in a kind of spacious and open space, then the attack of poisonous weed smoke is ineffective, only the enemy is in a closed and narrow space, so that it can be effective.

The inner city of Jinjinwei is just in line with the characteristics of closed and narrow space, and the wind direction at this time is also blowing west wind and the wind is not strong, which is indeed more suitable for using poisonous smoke to attack.

In fact, Cao Liang originally didn't think of using this method, but it was only after he saw the oleander that he had an idea and thought of this method.

Cao Liang preached to the other party: "Fang Bu, I have to work hard for you again, and then take someone to climb the mountain and cut down as many oleanders as possible." ”

"Yui!" Fang Bu accepted the order.

It was not so difficult to go up the mountain again, and with the presence of that rope, Fang Bu led the team to climb the cliff with ease.

This wild oleander grows on the back of the cliff, oleander is a large shrub, low and human-high, tall and even more than two feet high.

Because they knew that oleander was a poisonous weed, they were extra careful when cutting it, trying not to let the juice from the fracture get on their body as much as possible.

The felled oleanders were bundled into large bundles and thrown directly from the top of the mountain, and there were naturally Wei soldiers waiting to take them at the bottom of the mountain.

Since Cao Liang ordered to cut down as many as possible, Fang Bu and the others worked very hard to cut down all the oleanders on the top of the mountain, and there was not a single one left.

However, this perennial shrub is not afraid of cutting down, as long as the roots are there, it can grow again in no time.

Fang Bu and they cut down thousands of bundles of oleander branches, and the piles of branches there alone were already like a hill.

After dark, Fang Bu and the others went down the mountain safely and smoothly, and it could be seen that they were exhausted.

Cao Liang ordered his soldiers to take them down to rest, and then ordered people to hurry back to Xingshi overnight, bringing back some arsenic, croton, sulfur and other things.

Cao Liang's army did not have these things, but there were in the Wei army camp, as some special materials, they had been prepared before the expedition, as for whether they were used or not, it was another matter.

Oleander is not small in toxicity, but it is still a little worse than arsenic and other highly toxic things, and the use of poisonous smoke has some uncertain factors after all, so Cao Liang decided to increase the number and type of some poisons, and take a multi-pronged approach to ensure that nothing goes wrong.

Although there were not too many of these special supplies in the camp, they were almost enough for Cao Liang, who wanted to make poisonous smoke bombs, mixing arsenic, croton, sulfur and oleander chopped branches and leaves, wrapping them in straw ropes, adding flammable grease to make straw rope balls, which were set on fire and thrown into the city by catapults.

This poisonous smoke bomb, mixed with various poisons, is more poisonous than the loose oleander, and can play a greater role after being projectile into the city.