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Updated on April 9, 2011

The bayonet is large knife or dagger that can be attached to the muzzle of a rifle to convert it into a weapon for stabbing and slashing.

The name probably derives from the French city of Bayonne, home of Marechal de Puysegur, who is said to have invented the bayonet about 1640. There is evidence, however, that it had previously been adapted to the harquebus and other early firearms. With the invention of such weapons it was a logical step to affix a metal lance to the firearm. With little alteration, plugged into musket muzzles in the 17th century.

The bayonet used by Puysegur's troops when they took Ypres for King Louis XIV in 1647 was a steel dagger with a cross guard and wooden haft or grip that was tapered to fit into musket muzzles of various calibers. This plug-type bayonet was often too loose or tight, and prevented firing of the musket.

A bayonet attached to the muzzle by two loose-fitting rings appeared in the late 1600's, and this was supplanted by the closer-fitting socket-bayonet, adopted between 1697 and 1703 by the English, German, and French. Not until 1800, however, were the socket locks secured by means of locking springs.

In the course of their development, bayonets have varied greatly in length and shape. The regulation bayonet of United States troops in the late 1960s was 8 inches (20.3 cm) long. The modern U.S. Army bayonet is 14 7/16 inches (37 cm) long, with a blade length of 10 inches (25 cm). It has a handgrip so that it can be used as an all-purpose knife, and when it is not in use it is carried in a sheath.

The Rusty Bayonet Myth

I had always heard that a rusty bayonet was a violation of the Geneva Convention, apparently not. After searching for a mention of it all I could find in relation to bayonets was in the Protocol Additional to the Geneva Conventions of 12 August 1949, and relating to the Protection of Victims of International Armed Conflicts:

"Part III : Methods and means of warfare" that you're not allowed to use "bayonets with a serrated edge".

So there you have it, you can use a bayonet with rusty blade. Just make sure it's not serrated.


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    • joanveronica profile image

      Joan Veronica Robertson 5 years ago from Concepcion, Chile

      Very interesting article. I didn't know the bayonet was so old! I do know that at the end of the 19th century, Chilean soldiers used the bayonet to very good purpose, charging against highly defended positions. Legend has it that first they got intoxicated on a mixture of "firewater" (alcoholic) and gunpowder - the Devil's Brew. After that, they went wild and usually took the position! The bayonet played an important role and there are still folklore songs about it all.

    • weaponology profile image

      weaponology 6 years ago

      Thank you BSHistorian for shedding further light on the topic. :)

    • profile image

      BSHistorian 6 years ago

      I should clarify that even Hague (1907) doesn't specifically prohibit serrated bayonets - rather they have been interpreted by several countries as falling under the blanket of "calculated to cause unnecessary suffering" (probably following British complaints against Germany in the First World War). For example the UK & the Netherlands both have military manuals specifically mentioning them. The thing is that serrations on the back of the blade (the useful place for use as a saw - the original intention of serrations on a bayonet) are most certainly not 'calculated'. But since knife bayonets are too short to use as saws anyway, the feature has been conceded.

    • profile image

      BSHistorian 6 years ago

      I believe that's actually a reference - - to the Hague Convention (1907), which is the document that actually prohibits serrated bayonets;




      Means of injuring the enemy, sieges, and bombardments

      Art. 22. The right of belligerents to adopt means of injuring the enemy is not unlimited.

      Art. 23. In addition to the prohibitions provided by special Conventions, it is especially forbidden

      (a) To employ poison or poisoned weapons;

      (e) To employ arms, projectiles, or material calculated to cause unnecessary suffering;

    • weaponology profile image

      weaponology 8 years ago

      Thanks Wayne. I fully intend on covering all sorts of weapons from different eras.

    • waynet profile image

      Wayne Tully 8 years ago from Hull City United Kingdom


      I would certainly be interested in other weapons histories and this Bayonet hubpage is a great start on your weaponology writing journey!