Hearing Cheng Huaimo's shouts, Zhang Nan also stood up, but just as he stood up, Zhang Nan felt the darkness in front of him, and then his body fell down uncontrollably. Li Er held Zhang Nan quickly with his eyes and hands.

"Qingquan, are you okay? Are you hurting somewhere?" Li Er asked hurriedly.

If Li Shiji, Cheng Yaojin and Zhang Nan lost this battle, then Li Er would probably never forgive him in his life.

Zhang Nan was helped by Li Er, and he said for a while: "I am not seriously injured. I just drew a lot of blood just now. It's okay, just take a break. Let's take a look at General Cheng first."

After hearing Zhang Nan say this, Li Er felt relieved.

Zhang Nan walked to Cheng Yaojin in two steps, and then put it on Cheng Yaojin's forehead with his hand. It was indeed extremely hot. Even without a thermometer, Zhang Nan could guess that Cheng Yaojin's body temperature was definitely up at 38 degrees at this time.

Soon Zhang Nan changed the fever-reducing patches, fever-reducing drugs, as well as some anti-inflammatory drugs from the system.

"Come on, Huaimo, feed these pills to your father, and then put this thing on your father's head." Seeing Zhang Nan take out those little things of different colors, Cheng Huaimo did not hesitate at all. He quickly took a bowl of water and fed Cheng Yaojin to take it.

"Qingquan, what is this thing you are holding?" Li Er asked curiously with a capsule.

"This is also a pill. Master, have you forgotten?" Zhang Nan reminded. After Zhang Nan reminded him, Li Er vaguely remembered that he seemed to have seen this thing.

After knowing that he had seen him, Li Er didn't ask any more questions.

After Li Shiji was infused with blood and then Cheng Yaojin took antipyretics to clean the wound, Zhang Nan took a breath. The rest was all about whether the two people were hard or not.

Li Shiji lost too much blood. As long as he ensured that the wound would not bleed again, if he was transfused, Zhang Nan felt that he could be saved. Zhang Nan would not know about Cheng Yaojin's words. After all, the wisdom of ancient people could not be underestimated.

Although ancient bows and arrows did not write poison like in novels, in order to achieve the effect of killing enemies, soldiers usually painted something called "golden juice" on the arrows.

This "golden juice" is nothing else, it is a mixture of human and animal feces. If the arrows rubbed the human body, it would successfully infect bacteria on the wound. In ancient times, the disinfection efficiency was inefficient and there was no correct understanding of bacteria. Generally, when encountering this situation, it could only be treated as a fever, so the mortality rate was very high.

"Hey, by the way, why didn't I think of the tetanus vaccine? With this thing, this is not a problem at all." Zhang Nan suddenly remembered that if the wound is deep, he would have to be injected with the tetanus vaccine when he went to the hospital.

Zhang Nan's sudden shout quickly attracted everyone's attention.

"Qingquan, what are you talking to yourself alone?" Li Er asked.

"Your Majesty, I suddenly thought of a special medicine to prevent General Cheng and General Li's wounds from deteriorating. With this thing, the two generals will not have too many problems." Zhang Nan said excitedly.

"Oh? There is also such a thing, take it out quickly. If Zhijie and Maogong are both safe this time, Qingquan, you are the first one." Li Er was excited when he heard that Zhang Nan took out another new thing.

Because facts prove that every new thing Zhang Nan takes out is very useful.

Soon Zhang Nan produced two tetanus vaccines, and the system was very complete. When redeeming drugs similar to vaccines, even the drugs for the skin test were prepared.

Zhang Nan also tried hard to recall the skin test he had done when he was vaccinated, and then copied one side of the arms of the two generals. Soon, a soybean-sized bag was bulging on both of them.

"Qingquan, what does this mean? Why do I feel like there is something under the skin of the two of them?" Li Er asked.

"This is called a skin test, which is an experiment that must be done before vaccination. If a person experiences obvious allergies after the skin test, he cannot be vaccinated, otherwise it will be fatal." Zhang Nan said.

"I didn't expect that this medical science is so deep. It's because I'm short-sighted. Qingquan, you really have a wide range of knowledge in time traveling." Li Er sighed.

"Hi, it's average." Zhang Nan also smiled when he heard Li Er's praise.

Five minutes later, the two generals lying on the couch did not have obvious allergic reactions. Zhang Nan also boldly gave them one injection. After all, Zhang Nan finally breathed a sigh of relief.

"Your Majesty, in my opinion, we might as well retreat now." Zhang Nan said suddenly. After Zhang Nan said this, Li Er's face was also stunned, and then said, "Retreat, where to retreat?"

"Of course, it's back to the city. If Quangai Suwen sends a large army to siege us at this time, it will be difficult for our remaining troops to break through again. General Cheng and General Li need the most now is to rest. If there is no good environment, no matter how much we work, it will be useless." Zhang Nan advised.

Although losing a battle and then retreating is equivalent to running away, it is very unpleasant to spread, but what does face count for survival?

When Li Er heard Zhang Nan say this, he thought seriously. As Zhang Nan said, if Quangai Suwen attacked the city again at this time, the remaining troops of the Tang Dynasty would have no chance of winning. Even if he breaks through, it would be a very heavy price.

But now Li Er can't afford such a price at all.

After a long silence, Li Er finally put down his pride and said, "Retreat, we can no longer let our soldiers bleed in vain. After we are sure that Zhijie and Maogong are safe, I will definitely get it back."

Li Er finally let go, and Zhang Nan also looked happy. What Zhang Nan feared the most now was that Li Er couldn't let go of his face and wanted to fight Quan Gai Suwen to the death. Fortunately, Li Er was not someone who couldn't listen to the advice.

"If I pass on my military order, the entire army will withdraw to Qingzhou and reorganize. Everyone will travel lightly and simply. Be sure to quickly, discard all useless things, and now start gathering towards the rear of the camp." Li Er quickly issued an order, and after hearing this, Cheng Huaimo quickly stood up and quickly stepped out of the commander's tent to arrange it.

"Place Zhijie and Maogong on the hot air balloon, let them go back first. I see that the hot air balloon is quite large, so I can let Maogong bend his legs and lie in it a little. I will send them back to Qingzhou, Qingquan. You follow me and follow the army. Whether you can get rid of it depends on this time."
Chapter completed!