Stratagem No. 08 第八计 Enemy-dealing stratagems (敌战计)
Secretly cross at Chencang
Literal
Secretly cross at Chencang.
Fix their eyes on the obvious route, and take another road while they are still watching the first.
Source line
示之以动，利其静而有主，益动而巽。
Traditional 示之以動，利其靜而有主，益動而巽。
Show them a movement. Profit from their staying still and fixed on one aim. As the hexagram Yi (Increase) has it: it moves, and it is gentle.
Icons working translation — draft, pending review
The last words are from the judgment essay on the hexagram Yi (Increase): increase moves, and it does so with the gentleness of the trigram Xun, wind and wood. A visible movement pins the enemy to one expectation. The real advance penetrates by another way, without a frontal argument.
三十六计 · Chinese Wikisource edition (public domain)
Meaning
Secretly cross at Chencang means letting the enemy fix themselves on one route while you arrive by another. The visible movement is not optional decoration. The classical line says you show them action, and you profit because they stay still and committed. If nothing public is happening, a careful opponent watches every road. The shown movement gives them a theory. While they man that theory, the other road is only a rumour, or not even that.
Chencang is a real place, east of present-day Baoji, on a way out of the Han valley into the Qin heartland. The name has become general. Any pair will do: a front door and a side door, a public consultation and a quiet contract, a noisy product and the channel that actually sells. The hexagram’s gentleness is the point of the second road. It is not a second army crashing into the same gate. It is a penetration that is hard to see until it has arrived.
The story
Han Xin comes out by Chencang, 206 BC 暗度陈仓
Mixed
In 206 BC, after the fall of Qin, Xiang Yu made Liu Bang king of Han, over Ba, Shu and Hanzhong, and kept the Qin heartland for three kings of his own, of whom Zhang Han, the king of Yong, held the approaches. On the way into Hanzhong the plank roads, the timber galleries cut into the mountain walls, were burned behind the army. The Shiji gives two reasons: to block raiders, and to show Xiang Yu that Liu Bang had no intention of coming east again.
Later that year, in the eighth month by the calendar the Shiji is using, Liu Bang followed a plan of Han Xin’s and came back by the old road. Zhang Han met him at Chencang and was defeated, fell back, lost again, and shut himself in Feiqiu. The campaign then settled the Three Qin. What the Shiji states is the route and the result. It does not describe the contents of Han Xin’s plan, and it does not say that anyone was sent to repair the burned galleries as a noisy decoy.
The paired proverb, repair the plank roads in the open and cross at Chencang in secret, comes from later drama. Yuan plays put the repair into the story and give it to generals such as Fan Kuai, so that Zhang Han will stare at the galleries while the real army takes the old road. That is a clean illustration of this stratagem, and of making a sound in the east. It is also an addition. The historical core is narrower: the roads were burned on the way in, and the way out was Chencang, where Zhang Han did fight and did lose.
The march by Chencang in 206 BC is in the Shiji; the open repair of the plank roads as a decoy comes from later Yuan drama, not from that account.
Sources
- Sima Qian, Shiji 史记, ch. 8 (Annals of Gaozu)
- Sima Qian, Shiji 史记, ch. 92 (Biography of the Marquis of Huaiyin)
Myth check
The saying repair the plank roads in the open, cross at Chencang in secret is popular history. The Shiji records the burning of the roads and the march out by Chencang in 206 BC. It does not record the repair as a feint. That detail comes from later drama.
Modern application
An organisation that must enter a market the incumbent is watching will often open a visible project the incumbent knows how to block: a public bid, a flagship store, a noisy hire. The real entry is a partnership, a back-catalogue, a regulation, or a region the incumbent has filed under later. The visible project has to be real enough to deserve a defence. A transparent sham teaches the incumbent to look for the second road immediately.
Careers use a small version. The application everyone expects is sent, and the conversation that matters happens with someone who does not sit on that committee. The risk is moral only if the hidden road breaks a rule. The strategic risk is different. If the obvious route was your only real option, and the hidden one is a fantasy, you have shown movement and gone nowhere. The hidden road had to come out somewhere a force could stand.
Takeaways
- Give them a visible route worth guarding before you take the other.
- Do not explain the second road by using it too early.
- Make sure the quiet road actually arrives somewhere you can hold.
How to counter it
When an opponent ostentatiously struggles with the obvious approach, put a watch on the other approaches before you reinforce the obvious one. A shown difficulty is sometimes the bait.
Questions
What does secretly cross at Chencang mean?
It means fixing the enemy on one route with a visible movement, then arriving by another. In 206 BC Liu Bang, using a plan of Han Xin’s, came out of Hanzhong by the old road. Zhang Han met him at Chencang and was defeated, and Han took the Qin heartland. The phrase is now used for any hidden route beside a public one.
Did Han Xin openly repair the plank roads?
The Shiji says the plank roads were burned when Liu Bang entered Hanzhong, and that he later came out by Chencang on Han Xin’s plan. It does not say the roads were rebuilt as a decoy. The paired line, repair the galleries in the open and cross at Chencang in secret, comes from Yuan dynasty drama.