Interpretation: preach "crossing"; Chencang: The ancient place name, now Baoji East, Shaanxi Province, is a traffic tunnel leading to Hanzhong. Metaphor confuses the enemy from the front and secretly attacks the enemy from the flank. It is also a metaphor for secretly carrying out activities.

Historical allusion

When the Qin Dynasty was overthrown, Xiang Yu, the most powerful man, tried to rule the world. He has no scruples about the general, except Liu Bang. Earlier, he agreed with Liu Bang that whoever captured Xianyang first in Qin Dou would be the king of Guanzhong. As a result, Liu Bang was the first to enter Xianyang. Xiang Yu didn't want Liu Bang to be the king of Guanzhong, and he didn't want him to go back to his hometown, so he specially named him the three counties of Ba, Shu and Hanzhong, and he wanted to put him in a remote mountain. He claimed to be the overlord of the West Chu, occupying the vast fertile land in the middle and lower reaches of the Yangtze River and the Huaihe River basin, with Pengcheng as the capital.

Liu Bang did have the ambition to dominate the world, but he was in awe of Xiang Yu's power, so he had to obey the command, temporarily led the army westward and headed for Nanzheng, and accepted Sean's plan to burn all the hundreds of miles of plank roads he had walked all the way. The purpose of burning the plank road is to facilitate defense, and more importantly, to confuse Xiang Yu and make him think that Liu Bang really doesn't intend to come out, thus relaxing his guard against Liu Bang.

When Liu Bang arrived in Nanzheng, he found a talented person-Han Xin, so he worshipped him as a general and asked him to plan the military deployment to develop eastward and seize the world.

Han Xin's first step was to seize Guanzhong, open the East Gate, establish base areas, and prosper Han and destroy Chu. So hundreds of officers and men were sent to repair the plank road. Zhang Han, who is guarding the western part of Guanzhong, heard the news and thought that they would burn it themselves before repairing it. I don't know when such a big project will be completed, so I didn't pay attention at all. However, before long, Zhang Han received an urgent report that Liu Bang's army had invaded Guanzhong, their positions were occupied and their commander was killed. After Zhang Han confirmed the news, he quickly led the troops to resist. It was too late, and the Guanzhong area, known as Sanqin, was suddenly occupied by Liu Bang.

It turned out that Han Xin sent troops to repair the plank road on the surface and pretended to attack from the plank road. In fact, he and Liu Bang commanded the main force, secretly copied the path to attack Chencang, and won while Zhang Han was unprepared. This is called "building a plank road in the Ming Dynasty, hiding the truth."

Grow up Xinyu

Darkness is not only a war strategy, but also a wisdom to guide life. At the right time, we need to hide our true intentions and create a deceptive illusion, which makes it easier to succeed. The key to deceiving others is to conceal one's true intention and purpose. It can't be discovered, and it can't be foreseen. Therefore, the trick that scammers often play when deceiving others is to divert attention from the West. Pretend to aim at a target, pretend to attack seriously. In fact, it is to secretly aim at the target that others don't pay attention to, and then wait for an opportunity to give a fatal blow. Sometimes it seems that you reveal your thoughts inadvertently, but you are actually cheating others' attention and trust, with the aim of making a surprise attack. At this time, darkness has become a philosophy that is easy to succeed.