The current Qin State is not the only opponent of the Chu State, the Qi State is still very strong, especially the swallowing Yan State, and the strength is already obviously advantageous compared to the Qin State.

Seeing that the King of Qin had some intentions, Zhang Yi's heart suddenly sank, the last time he debated with Sima Cuo about whether to cut down Han or Shu, as a result, Zhang Yi's boastful talk was completely vulnerable in the face of Sima Cuo's pragmatic words, and King Qin adopted Sima Cuo's proposal to cut down Shu.

I didn't think that this time about the matter of ceding Pakistan was once again refuted by Sima's remarks about seeking truth from practice, which was full of loopholes.

If Sima Cuo refutes himself in front of King Qin again, then he Zhang Yi will definitely fall in the heart of King Qin.

Once he loses the trust of King Qin, what will happen to him Zhang Yi, Gongsun Yan and Chen Zhen are examples of the past, these two people were squeezed out of the Qin State by him Zhang Yi.

Thinking of this, Zhang Yi said to King Qin again: "King, what Keqing said is very reasonable, but Weichen has a question and wants to ask Keqing." ”

When Sima Cuo heard this, he saluted Zhang Yi and said, "Please give me advice." ”

Zhang Yi asked, "I don't know who is stronger and who is weaker than our Qin State and Chu State now. ”

Sima Cuo glanced at Zhang Yi in surprise, then looked at the thoughtful King of Qin, thought for a while and said: "Qin and Chu are almost the same, but at present, our Qin State occupies an absolute geographical advantage relative to Chu State, and once a war occurs, even if our Qin State does not win, it will not lose." ”

King Qin Huiwen nodded slightly when he heard Sima Cuo's remarks, just as Sima Cuo said, the Qin State is not only facing the Chu State, but also facing other Kwantung countries since the Qin State recovered the land west of the river, even if it does not win, it will not lose.

Zhang Yi smiled and said: "King, what Keqing said is good, the strength of our Qin State is not stronger than the strength of Chu State, and the two battles between Qudi and Yuzhong last year are enough to prove that the strength of Chu State is not weak." ”

"Now that our Qin State wants to attack the Chu State, there are only four ways. One of his troops went out of Wuguan and attacked the Danshui Valley of Chu State. The second army went out of Nanzheng and attacked Hanzhong County of Chu through the Han River. His three soldiers went out of the country of Ba and attacked Wujun of Chu through the river. Fourth, he used Korea to attack the Fangcheng area of Chu State. ”

"It is true that now our Qin State has a geographical advantage over the Chu State, and the Chu State needs to pay a lot of effort to attack the Qin State in order to get a point. But vice versa. ”

"If our Qin State uses Korea to attack Chu State, then once Korea falls to Chu State, then our Qin State will face a battle again."

The Battle of Yan refers to the fact that when Qin and Jin were fighting for hegemony, Qin Mugong crossed the Jin State and went on an expedition to Zheng State, but he returned in Zheng State in vain, and on the way back of the army, he was attacked by the Jin State in Yanshan and the whole army was annihilated.

For the countries that have crossed other countries and traveled thousands of miles away, whether they are the countries that propose to borrow the way or the countries that are borrowed, they are all terrified in their hearts.

If you lend the road yourself, and the country that comes to borrow the road has a flash of inspiration and plans to take the sheep and get a handful, then you want to cry without tears.

And the country that proposes to borrow the road sends out its army, and the logistical supply routes all have to pass through this country, not to mention the tragedy of the war of the dead, if the country that lent the road suddenly has a thief incident, and the logistics supply is snatched away, or the back road is cut off, what can be done!

In fact, this is not the most important thing, the most important thing is that even if the war is won smoothly, how can the gains obtained through the war be maintained for a long time, and who can hold an enclave for a long time?

Even if the defender is capable enough, even if the defender is loyal enough, but after a long time, the monarch will naturally become suspicious.

Therefore, as for the matter of Qin attacking Chu through the pretext of Korea, Qin was repulsed, because the purpose of this was to cheapen Korea.

After Zhang Yi finished talking about borrowing South Korea, he went on to talk about the other three roads: "King, in addition to borrowing South Korea, the best way to take the remaining three roads is the Wuguan line." ”

"But even if we go through the Wuguan, our Qin State has to pass through the rugged Yuzhong region, and last year, our Qin State and Chu State were in a stalemate in China for several months, and it is precisely because the Chu State is not easy to fight against our Qin State, and it is also difficult for our Qin State to fight back against the Chu State."

"Now although the army of the State of Chu has been withdrawn from the Yuzhong region, the army of the State of Chu Zhuguo Jingcui is still defending in the Danshui Valley, and this road is still easy to defend and difficult to attack."

"And starting from Nanzheng, passing through Hanshui, attacking Hanzhong County of Chu State, its difficulty is compared with Chu State's attack on Nanzheng from Hanzhong, except for the advantage of downstream this one, there is no difference in others, if you want to break through the defense of Hanzhong County of Chu State from the front, under the condition of 100,000 heavy troops of Chu State, Weichen thought it was impossible."

"As for the troops going out of Ba to attack the Wu County of Chu State, Wei Chen thinks that the difficulty of this is greater than that of attacking Hanzhong County of Chu State."

"As we all know, Chu and Ba are not in harmony, decades ago Pakistan was in turmoil, Ba General Ba Manzi asked Chu to help Ba put down the chaos on the condition of Yuyi (White Emperor City) Wujun and other three cities. After Ba Guo pacified Ba Guo with the power of Chu, in order to keep the three cities from losing, Ba Manzi cut off his head and gave it to the king of Chu to repay Chu for his help. ”

Subsequently, Bachu contended, even if Ba Guo allied with Shu, it was still defeated by Chu, not only lost Wu County, but also fell into the hands of Chu State. Now if the State of Chu wants to attack Jiangzhou of Baguo, only the Xiongguan of Yangguan remains, so even if it can go down the river to attack Wujun from Baguo, it is also difficult to face the two dangerous passes of the Pass and the Pass, and it is not easier than the State of Chu to attack Yangguan against the current. ”

In the past, when the Qin State seized Bashu, the Chu State did not fail to pay attention to the Ba State, but the Ba State was heavily guarded against Yangguan, and the Chu State did not find an opportunity for a while.

And the reason why Qin was able to capture Ba was because Ba thought that Qin was a reinforcement he had invited and was here to attack Shu, but he didn't want Zhang Yi and Sima to attack Shu after they captured Shu.

Zhang Yi continued: "King, if we want to defend the country of Ba, we only have one line of defense in Yangguan, and if we want to attack Wujun, we must not only face two difficulties, but also face the unpredictable river. The water war is the disadvantage of our Qin State but the advantage of the Chu State. ”

King Qin Huiwen nodded approvingly, although Sima Cuo depicted a grand blueprint of winning Shu that is getting Chu and winning Chu and dominating the world.

However, after King Qin Huiwen and Chu really fought each other, he deeply felt that Sima Cuo's plan, in addition to greatly aggravating the contradictions between Qin and Chu, was just a castle in the air, out of reach.

Because the state of Chu at this time was not weak, attacking Qi and attacking Qin was very eye-catching in the world, especially the king of Chu overwhelmed the king of Qi and became the leader of the princes' alliance, and he had the posture of dominating the world. If it weren't for the failure of the Qin invasion, I'm afraid that the current overlord country would have been determined to be the Chu State.

Sima Cuo's plan was not wrong, the mistake was that the Qin State at this time did not have the strength to unify the world.