Why not a bayonet ?

Joined
Mar 9, 2002
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Questions about using a knife for self-defense seem to fall in the same camp as what gun/ammo should I carry concealed for self-defense, and what kind of gun should I carry in grizzly country. Interesting armchair discussions, but unlikely to really be of much use in day-to-day life for most people. Still, I did say it was interesting, so with that prologue, let me briefly state my current understanding of defense with an edged weapon, and the basis for my Subject question.

It seems that edged weapons can be used in 4 ways for self-defense:

Sword only group:

1. As a club. My brother who was in the navy told me in days of sailing ships, sailor's swords were not sharpened on the edge. A sharpened sword edge could stick in the enemy, and then you have lost further use of your weapon. So the sword was really used as a club.
If I recall correctly, in a previous post an ex-serviceman said that in combat he would grab his entrenchment tool before a knife for hand-to-hand combat. The entrenchment tool would also be used as a club.

2. For hacking. With sharp-edged swords, samarai and conquistadors could hack off enemy arms and heads. (Colonel Jeff Cooper mentions this is a recent interview in one of the gun magazines.)

Swords and knives:

3. For stabbing. Try for a killing stab to the heart, artery, etc. (In the Cooper interview, he seems to see this as the primary use of a knife for self-defense.)

4. For slashing. This is primarily for disabling the opponent. When he tries to strike you, you slash his arm and cut muscle and ligaments, thereby disabling further use of his arm. You are trying to cripple him to stop him. (Although I suppose a slash across the throat is a killing blow equivalent to a stab to the heart. Maybe even more immediately effective. )Somewhere recently I read an article where the author said that stabbing was not the best use of a knife in self-defense situations. First, since it is likely to kill the attacker, the defender will face potentially more serious legal problems. (This is a side issue that could be argued all day, and I don't want to distract from actual fighting practices .) Second, a killing stab may not be immediately effective, and the person receiving the stab wound may be able to still cause much harm before expiring. So disabling the attacker by slashing was a safer defense strategy.

I suspect one would need to be a better trained fighter to effectively slash to disable an opponent then to stab to kill him. Most people seem to be concerned more about a fighting knifes stabbibg ability than its slashing ability.

So if one is to carry an edged weapon for self-defense, and swords are not practable because of thier size, if one can still carry a fixed blade and is not worried about hiding the knife so need not rely on a folder, why not carry a sharpened bayonet ? Bayonets are cheap. They may not penetrate as easily as a thinner bladed knife, but one needen't worry much about it breaking either. They were made for stabbing. (Al-be-it two-handed stabbing at the end of a rifle.) Although not a sword, they are heavy enough to have some clubbing potential. The M-16 baynets of the Viet Nam era are fairly compact, available and cheap. So why are they not more popular ?

By the way, I asked a SOG soldier with Viet Nam service about carrying a fighting knife. He said he had carried a Buck 110 folder, that he had attached a thumb stud, when he was in the field. But he had no intention of using it for fighting. He said when in the field, he had an M-16, a Browning Highpower pistol, and Claymore mines. If his guns failed, he figured he would be in the middle of a battle and would pick up another rifle off the ground. He used his knife as a utility tool. I suspect these days he would carry a multi-tool rather than the Buck folder.

I do not carry a knife for self-defense, or a bayonet either for that matter. But after reading the Cooper interview, and previous posts on this site, it has caused me to form the initial impressions detailed above. Any insights would be appreciated.
 
not2sharp- thank you for the welcome, and for the site reference. It is interesting to see the different bayonet configurations over the years.
 
Maybe the original post got too windy. Still, I would appreciate perspectives.
 
About the swords...

The unsharpened sword is not actually true across the board... A Cavalry saber for example, had the first 1/3 or 1/2 was sharpened to an almost razor's edge. The rest of the edge was then left unsharpened or sharpened to an edge somewhat like that on an axe. This allowed versatility is stabbing, slicing, blocking and clubbing. If one needed to club with a saber, then all one would have to do is strike with the side of the blade. I've seen fights in the Bahamas where someone "bitchslapped" an opponent with the side of a Machete.
 
Hi Arnie,

Welcome back....

There was nothing wrong with your initial question. Bayonets have gone through a wide evolution of thought over a very short period of time. Originally they were designed primarily as sporting weapons. The hunter having discharged his musket needed a weapon with which to fend off, and finish wounded game. Dropping your musket while drawing your hunting sword could be an uncomfortable manuver when you are facing a wounded boar intent on doing you harm.

These weapons were then adopted by the infantry, who armed with a slow loading musket, needed a way to repel a violent calvary attack. The famous British Square would have fallen flat, or been flatten, were it not for their bayonets.

As firearms underwent a rapid evolution, the bayonet, attempted to evolved with them. If they spent less time at the end of a rifle perhaps they could be used as a short sword and sidearm. The least relevant they became as a weapons system on the battlefield the more there was experimentation to find them a new function. They were pressed into service as a machetes, or bolos, or shovels, and as wirecutters, woodsaws, camp knives, and fighting knives; and, they were even used as badges of authority?

So yes some bayonets make excellent fighting knives. They should be since that was an important design criteria. The U.S. M-7 (M-16 rifle), M4 (M1 carbine), M5 (Garand rifle), and M6 (M14 rifle) bayonets, used from WWII until the 1980s, all used a blade originally designed for the M3 fighting/trench knife of WWII. They are esentially beafed up versions of the Sykes-Fairbairn commando knife.

The downside of using bayonets as fighting knives is that:
1) They tend to be fixed bladed
2) They tend to be large
3) They tend to have awkward guards and handles (due to the muzzle
rings and latching mechanisms)
4) They were often designed to be blunt edged - some have no edge at
all (the bayonet is primarilly a thrusting weapon where a sharpen
edge is just a weakened stress point)

So what is a soldier to do? Converting bayonets into practical field knives and fighting knives became an ongoing military tradition throughout the Twentieth Century. It seems that just about everybody has converted some bayonet into a "Theater Knife". But, before you go down that road, check to make sure that the bayonet you are using for the raw material is not a rare and valuable one.

n2s

I hope you have the opportunity to post more often this year. :D
 
What a GREAT thread! To me, this is what blade Forums is all about. Guys who love sharp things just knocking info around. I can't add anything worth while to this thread, but I enjoyed it. This place may be one of the few truly good things abount the 'net;) :)
 
Well, if you could carry it openly, then I suppose that a bayonet would do the job just as well as anything else. If you wanted to conceal it though, the mounting ring would make it pretty noticeable and not too comfortable either. Plus, most bayonet sheaths were primarily designed to be worn on web gear and aren't much good with civilian attire. Then there's the fact that most of them are made of seriously inferior steel and won't take an edge that's worth the effort to grind it on, and basically to me it seems to be an exercise in futility. For similar money you can get a Marine Combat knife that has a better handle, sheath and blade. Basically, yes, you could use a bayonet for self defense and if I were in a bad situation and I could get my hands on one I'd use it, but if I were planning ahead about what I would use, I'd pick something else.
 
the concept behind the Bayonet being a knife... You want a knife capable of withstanding the trusting and leveraging of what is essentially a 7 inch blade with a 4 foot handle. The knife must withstand the swinging and prying force behind thrusts and parrys and may in fact be thrust into the ground, trees, or bodies and then the rifle swung back and forth in order to "unstick" the bayonet. Any knife made to hold a good hard edge will not hold up to such use, and any good bayonet built to withstand such use will not hold a "hair-popping" edge. So, you make the best compromise you can. In the end, many who must carry a bayonet for their rifle also carry a good field knife as well.

As an aside, I remember seeing quite a few M-7 Bayonets break with rough use, although they did take a good edge.
 
Thanks for the replies. I learned a few things. I do not frequent this site often, but stop by on occassion. I have learned quite a bit about edged tools here.
 
The M4-M7 bayonets have bulky, clumsy, handles that are too heavy for the blade size. The balance is way off. They give great penetration when thrown by the blade, but I wouldn't want to carry one as a fighting knife. The M3 fighting knife is not too bad. I had a repro M3 that I liked after I had sanded the handle down to a thinner profile and reduced the pommel. I have cut off the barrel ring and ground down the handles on M4-M7 bayonets to make reasonable knives. I have also taken off the hand grips, cut down the guard and pommel, and wrappen the tang with cord to make a reasonable knife.

Bayonets with 12 inch blades or longer (ala WWI) are reasonably balanced. In general you want a knife that is a bit blade heavy for a fighting knife. The Kabar style have handles that are a bit heavy and fat for fighting. A bowie style is better. A Kabar style with a 3/16" thick blade would really improve a Kabar as a fighting knife.
 
By itself, not mounted on a rifle, the bayonet is'nt that great of a weapon. At best it's just a big knife, at worst it's an unsharpened giant knitting-needle.
But everything changes when it's mounted on the end of a rifle. It becomes a very powerful and effective weapon.
I promise, you would NOT want to be on the receiving end of a bayonet attack from a young fired-up Marine or Soldier.

The secret of the bayonet lies in leverage, weight, and momentum.
The rifle that the bayonet is attached to is as important as the bayonet itself, and determines a great deal of the bayonet's effectiveness.
A longer rifle gives more power when slashing, and a heavier rifle gives more power when thrusting.
But today's assault rifles are getting shorter and shorter, and lighter-weight as well. So I think the days of the bayonet are surely numbered.

I would fight with a mounted bayonet, but I would choose many other weapons over an unmounted bayonet.

Good luck,
Allen.
 
Compared to the weight of a sword, even a light carbine has reasonable weight for a thrusting bayonet attack. As a great example take a look at John Styers' WWII Marine handbook "Cold Steel". It gives examples of using an M1 carbine with a bayonet. This includes using a one-handed "fling point" thrust for extra reach. With a lighter weapon you need techniques for greater speed. With a shorter weapon you need techniques a little more like fencing for extra reach.
 
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