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| Historical Chinese butterfly swords with paired blades and shared scabbard |
Wing Chun Knives: How Were They Really Carried?
The paired knives used in Wing Chun are among the most recognizable weapons in Southern Chinese martial arts.
They are commonly called butterfly swords or butterfly knives in English, while Wing Chun lineages use several Chinese names for the weapon and its associated training methods.
They belong broadly to the Chinese dao (刀) family of single-edged weapons.
But the weapons were never exclusive to Wing Chun.
Related paired blades appear in Hung Gar, Choy Li Fut, White Crane and numerous other Southern Chinese martial traditions. Historical examples also show considerable variation in blade length, width, point, guard construction and overall proportions.
That raises an interesting question.
If these weapons were actually carried for fighting rather than martial-arts demonstrations, how were they worn and drawn?
The answer turns out to be less obvious than many Wing Chun traditions suggest.
First, There Was No Single Standard Butterfly Sword
Modern martial-arts equipment can give us a misleading picture of historical weapons.
Today we order a pair of Wing Chun knives manufactured to a particular design.
Historically, there was much more variation.
Nineteenth-century examples differ considerably in blade profile, length, guards, materials and intended function. What seems particularly characteristic of the Southern Chinese hudiedao tradition is not one exact blade shape but two single-edged blades constructed so that they could fit together into a common scabbard.
This is important.
We should be careful about taking the dimensions of a modern Wing Chun training weapon and projecting them backward onto every nineteenth-century pair of double swords.
There probably never was one universal historical design.
What Do We Actually Know About Their History?
The historical record becomes reasonably useful during the nineteenth century.
Period descriptions from the Pearl River Delta discuss short paired swords, usually calling them simply “double swords.”
An 1830 account described two short blades whose inner surfaces were ground flat so that they fitted together inside a single scabbard. The same account described them as sharp weapons capable of causing severe wounds.
By the 1830s and 1840s, sources also associate such weapons with militia and fighting in Guangdong.
They were therefore not merely ceremonial Kung Fu weapons.
They were actual weapons.
And that immediately creates problems for one of the most popular stories about them.
Were Butterfly Swords Created by Shaolin Monks?
A widespread martial-arts legend says that butterfly swords originated at Shaolin.
Versions differ between lineages, but the basic story is familiar.
According to the tradition, Buddhist monks needed weapons that would allow them to defend themselves while respecting the prohibition against killing.
The knives were therefore supposedly designed with only part of the blade sharpened.
The unsharpened section could block weapons or incapacitate attackers without killing them.
Some versions even claim that the monks concealed the knives in their boots or robes.
This story continues to circulate in modern Wing Chun literature.
But there is an important distinction:
Evidence that a tradition exists is not evidence that the tradition is historically true.
At present, I know of no reliable historical evidence demonstrating that Shaolin monks invented the hudiedao.
Meanwhile, nineteenth-century evidence places these weapons firmly within the wider martial culture of Southern China.
So the Shaolin explanation should be presented as lineage tradition, not established weapons history.
The “Non-Lethal Buddhist Weapon” Problem
There is another problem with the story.
These were knives.
A historical description from 1830 explicitly described the double swords as sharp, heavy enough to cause severe wounds and reportedly used to disable opponents by attacking the legs.
That doesn't sound like a weapon specifically engineered around nonviolence.
Nor would partially sharpening a blade transform a large knife into a non-lethal weapon.
A heavy blunt section of steel can still cause serious injury, while the sharpened portion remains capable of cutting deeply.
It is certainly possible that individual blades had sections deliberately left less sharp for functional reasons, including contact with opposing weapons.
But moving from that observation to:
“Buddhist monks designed the weapon this way so they wouldn't kill people”
requires historical evidence.
Without it, we have a story explaining a physical feature—not proof of why that feature existed.
Were They Carried in Boots?
This is one of the claims I find particularly difficult to accept literally.
A fighting weapon has to be accessible.
Placing two substantial blades inside footwear creates obvious problems with movement, comfort and drawing the weapon quickly.
More importantly, historical evidence gives us something better than speculation:
we have surviving scabbards and period descriptions of how the pair fitted together.
The characteristic hudiedao pair could share a single leather scabbard.
That tells us these weapons were designed to be transported as a pair.
It doesn't prove that nobody, anywhere, ever concealed a short blade in a boot.
But the existence of a purpose-built shared scabbard makes the sweeping “butterfly swords were carried in the boots” story unnecessary.
What About Carrying Them Inside the Sleeves?
Another explanation sometimes encountered in martial circles is that the weapons could be concealed inside the large sleeves of traditional Chinese clothing.
Could someone conceal a sufficiently short weapon in loose clothing?
Of course.
Does that establish sleeve carry as the normal historical method?
No.
Again, the surviving material evidence points us toward scabbards.
The pair was specifically designed so that the two blades nested together and occupied a single sheath.
That is a very practical arrangement.
Two weapons could be carried almost as conveniently as one.
When needed, the practitioner drew the pair and separated them.
The more interesting historical question therefore isn't whether somebody could hide a knife inside a sleeve.
It is:
Where was the shared scabbard normally positioned on the body?
And here the evidence becomes less certain.
Were Wing Chun Knives Worn at the Waist?
This is where I want to preserve something from my original article, but label it correctly.
My conclusion from practicing Wing Chun is that waist-level carry makes considerable functional sense.
A shared scabbard positioned around the waist would make the weapons reasonably accessible while allowing the practitioner to move normally.
More interestingly, certain movements found in Wing Chun's empty-hand forms can be interpreted very naturally as movements connected with freeing the arms, reaching the waist and drawing weapons.
For example, I have long suspected that parts of Siu Lim Tao traditionally given complicated empty-hand applications become much easier to understand when considered in relation to drawing paired knives.
The same possibility occurs in other parts of the system.
But there is a crucial distinction.
This is a practitioner hypothesis, not established history.
I can demonstrate why I think the movement makes sense mechanically.
That doesn't prove that the movement was historically created for that purpose.
To establish that, we would need earlier descriptions, manuals, photographs, reliably dated oral testimony or other evidence connecting those movements explicitly to weapon drawing.
At present, I don't have that evidence.
So I think the hypothesis is worth investigating.
I don't think it should be presented as fact.
Was Wing Chun Originally a Knife-Fighting System?
My original article made an even stronger claim:
Wing Chun developed from double-knife fighting and the empty-hand system came from the knives.
I would no longer state this as established history.
There is an intriguing argument behind it.
Wing Chun emphasizes relatively compact movement.
Its weapons include paired short blades.
Many principles used with the knives can also be recognized in empty-hand practice.
And Southern China's nineteenth-century martial environment certainly contained these weapons.
But similarity of movement doesn't establish chronological direction.
Maybe knife principles influenced empty-hand Wing Chun.
Maybe existing empty-hand principles were adapted to the knives.
Maybe both developed together.
Or perhaps both inherited movement principles from an older shared martial environment.
Without stronger evidence, we cannot confidently choose among these possibilities.
This is exactly where martial-arts history becomes interesting.
A plausible explanation is the beginning of research, not the end of it.
What About the Red Boats?
Butterfly swords are sometimes connected with the famous Red Boat traditions associated with Wing Chun's origin stories.
There is a practical attraction to the hypothesis.
Short weapons obviously require less room than spears and other long weapons, and paired Southern knives existed in the same broad nineteenth-century environment in which the Red Boat traditions developed.
But again, possibility is not proof.
We know hudiedao were widespread in Southern China.
We know they were associated with civilian martial artists and militia.
We know multiple Southern martial traditions eventually incorporated them.
Therefore, Wing Chun doesn't necessarily require one mysterious individual who introduced the weapon into the system.
Wing Chun practitioners existed within a broader Southern Chinese martial culture in which paired knives were already available.
The simplest explanation may eventually prove to be the least dramatic one:
Wing Chun adopted a weapon that was already part of the martial environment around it.
Exactly when and how that happened remains another question.
What We Know, What We Suspect and What We Don't Know
This is a good example of why researching traditional martial arts requires several levels of evidence.
We know that paired short single-edged swords were present in nineteenth-century Southern China.
We know they existed beyond Wing Chun and were used in several Southern martial traditions.
We know historical examples varied considerably.
We know characteristic pairs could be fitted together into a single scabbard.
We also have traditions connecting the weapons with Shaolin, Buddhist monks, Red Boats and other elements of Wing Chun history.
Those traditions deserve to be recorded.
But recording a tradition and proving a historical event are different things.
Then we have practitioner analysis.
My own examination of Wing Chun leads me to suspect that the knives may have influenced the system more deeply than is commonly recognized and that some empty-hand movements may preserve actions originally connected with carrying or drawing weapons.
I consider that hypothesis worth exploring.
I don't consider it proven.
And finally there are things we simply don't know.
We don't know exactly who first created the characteristic Southern Chinese hudiedao.
We don't know exactly when they entered Wing Chun.
We don't know whether Wing Chun's earliest recognizable form already included paired knives.
And we don't yet have sufficient evidence to reconstruct confidently how early Wing Chun practitioners carried and drew them.
That is not a disappointing conclusion.
It gives us somewhere to continue looking.
The Wing Chun knives are historically interesting precisely because the weapon survives while much of the story surrounding its adoption does not.
The next step isn't to choose the legend we like best.
It is to keep searching for evidence.