"Han Xin! He has offered advice to Xiang Yu several times, but he has not been adopted, and now he should be disheartened, this is the time to invite him, if you want to fight for the world, then you must invite Han Xin over, he is a rare general in the world. Ling'er said loudly.

"Han Xin, yes, why did I forget him, I will write a secret letter and ask General Peng's people to send it quickly. I was still thinking about the strength of the army, about the bravery, the strong, and the excellent, how could I compare with the eldest brother, but if Han Xin helped, the combined intelligence of several of us would be enough to compete with the eldest brother. Xiang Zhuang patted his head and raised his eyebrows.

Peng Yue saw that he said Han Xin so badly, and said with disdainful eyes: "What can Han Xin do, you value him so much? I haven't even heard of this person's name, what is so good about him?"

Xiang Zhuang said: "General Peng doesn't know, Han Xin is really talented under the eldest brother, so he is not famous, but his plans and strategies have been realized many times, if the eldest brother reuses Han Xin, Xianyang may have been won long ago, and the world has already been decided." ”

Peng Yue was still unconvinced, and said: "The general takes such a fancy to Han Xin, can you tell me about Han Xin's affairs so that the last general can also know a little bit and broaden his horizons?"

Xiang Zhuang smiled and said: "General Peng doesn't know, Han Xin is indeed a military wizard, let me tell the general about Han Xin's soldiers." ”

Once, the eldest brother only gave Han Xin 1,500 soldiers to fight with the Qin general Sima Xin. After a hard battle, the Qin army was defeated and retreated to the camp, and the Chu army also suffered four or five hundred casualties, so Han Xin reorganized his troops and horses and returned to the base camp. When they reached a hillside, suddenly a rear army came to report that the Qin cavalry was chasing after them.

I saw dust flying in the distance, and the sound of killing shook the sky. The Chu army was already very tired, and at this time the team was in an uproar. Han Xin's soldiers and horses reached the top of the slope, and when he saw that the enemy was less than 500 horsemen, he hurriedly ordered troops to meet the enemy.

He ordered three soldiers in a platoon, which resulted in two more, then ordered five soldiers in a platoon, which resulted in three more, and another seven soldiers in a platoon, which resulted in two more. Han Xin immediately announced to the soldiers: Our army has 1,049 warriors, and the enemy is less than 500.

When the soldiers of the Chu army heard this, they all admired the five-body projection, and everyone felt that Han Xin was "a clever calculation". So the morale increased greatly, for a time the flag waved, the drums were noisy, the Chu army was advancing step by step, the Qin army was in chaos, and soon after the battle, the Qin army was defeated and fled.

Later, I was amazed at why he reported the number of soldiers so quickly and accurately, and he wrote me this arithmetic problem on a piece of paper: (There are things today, I don't know how many they are, three or three counts, two left, five or five counts, three left, seven or seven counts, two left, ask the geometry of things?)

I forgot to sleep and eat, and meditated day and night, but I didn't have a clue. After more than half a month, I found out that this was twenty-three, but it was made up by hard numbers, and I wanted to list an equation that could be used for every number, but I couldn't think of it even if I wanted to break my head, let alone calculate it in the blink of an eye like Han Xin.

When I went to Han Xin to ask again, he smiled and said, "It's actually easy to tighten." Multiply the remainder by seventy for three or two, multiply the remainder by twenty-one for five or five, and multiply the remainder by fifteen for seven or seven. If the sum of the three is not greater than one hundred and five, it shall be the number of answers, otherwise one hundred and five or multiples thereof shall be subtracted. ”

I immediately thought about it in my heart, and sure enough, it was not bad at all, and I recited in a low voice: "Count three or three, multiply the remainder by seventy, count five or five... Han Xin said: "You don't have to memorize it like this, I read a poem to you, then it will be easy to remember: the three of them are seventy rare, five trees and plum blossoms are twenty-one, and the seven sons are reunited for half a month, and the remaining one hundred and five will know." ”

I am using the method he taught, Han Xin led 1,500 soldiers to fight, four or five hundred people were killed, standing in a row of 3 people, 2 more people, standing 5 people, 4 more people, standing 7 people in a row, 6 more people, if there is one more, it can be rounded, the number of survivors should be between 1000-1100 people, you can get:

3 times 5 times 7 times 10 minus 1 = 1049 people.

After hearing this, Peng Yue praised again and again, and said: "This Han Xin is really clever, if he is allowed to work with us, it doesn't matter if there are few soldiers at the moment, there is such a talent to assist the general, why is Xiang Yu afraid?"

After three days of discussion, Peng Yue's army changed its banner and called it the "Zhuang" army, which was distinguished from Xiang Yu's Chu army, and when Xiang Yu and Liu Bang were fighting, the Zhuang army was recruiting troops and horses, recuperating and waiting for Han Xin's arrival, and on the other hand, it fought guerrilla warfare in the rear of Xiang Yu to block Xiang Yu's army's food and grass.

A few days later, Ling'er's injuries had healed, and the scouts sent by Xiang Zhuang also received news that Liu Bang had opened Yaoguan, the southern gate of Xianyang, by bribing the Qin generals. At this time, Zhao Gaogou jumped over the wall in a hurry, killed the monarch in Wangyi Palace, and set up the nephew of the second emperor, Ziying, as the king of Qin, and Ziying designed to kill Zhao Gao. Xianyang City was in chaos, and Liu Bang took advantage of the situation to enter Xianyang. He sent people to garrison Hangu Pass, and when Xiang Yu attacked Hangu Pass, let our army attack from the rear of Xiang Yu's army, and attack back and forth.

Peng Yue was very excited when he heard this, but Xiang Zhuang was silent, what was waiting for them would be a high-intensity long-distance and rapid march, and the Chu army was now at its most demoralized, well-trained, and the number of people was several times ours, where was our opponent of more than 10,000 people.

That night, Xiang Zhuang, Peng Yue, Ling'er and many other generals met overnight, dozens of pine torches illuminated the big tent as bright as day, a huge white cloth of eight feet square had been hung on the wall in the middle, Xiang Zhuang was drawing many patterns on the white cloth on the charcoal, there were mountains and rivers, there were river rivers, there were river lorios, there were city piers, there were also big roads, it was the topographic map of Nanyang, Chen County, Yingchuan, Sanchuan counties.

Xiang Zhuang began to check the terrain from the beginning of the march and battle, to understand the territory of the Qin State, and studied the terrain for several days until late at night, because the general topographic map of the Six Kingdoms had almost been imprinted in his mind, and he could draw it at any time if he wanted to.

Xiang Zhuang was well drawn, and the scout Chen Sui went straight in and made a report: "General, I have inquired clearly, Xiang Yu's army has arrived at Hangu Pass, and he will be ready to enter the army in the next two days." ”

"Hanguguan, here!" Xiang Zhuang immediately drew a small circle on the white cloth with charcoal, and then pointed to the map to Peng Yue and the others: "Everyone, please see, this is Linzi, more than 300 miles north from Linzi is Aocang, and then 300 miles north from Aocang is Xianyang, and besides, there is a gallop road to go from Aocang to Xianyang for 300 miles, and the army is advancing rapidly, and it should be able to arrive within ten days!"

Peng Yue said: "The general wants to take Aocang first, and then turn around Xianyang, but he is afraid that Liu Bangjun will not be able to resist Xiang Yu, and blame us for not jointly attacking Xiang Yu." ”

Xiang Zhuang smiled slightly, and said: "Our alliance is not the opponent of the eldest brother at this time, the eldest brother is now 500,000 soldiers, and there are many talents under the account, now is not the time for us to confront head-on, quickly send troops to inform Liu Bang to withdraw from Hangu Pass, with my understanding of the eldest brother, as long as he says something good to the eldest brother, the eldest brother will let him go, we take this opportunity to attack Aocang, take the largest granary in the world, and have Aocang as our base, the revival of Great Chu will have a solid guarantee." ”

Peng Yue raised a question at this time: "Although the general's plan is good, the question is, Nanyang, Yingchuan and Aocang near Aocang are connected to each other in a triangle, will we be intercepted and killed by the defenders in these two places before we reach Aocang?"