| Unidentified group of men training knife fight | |
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| November, 2021. Moscow, Russia | |
Aknife fight is a violent physical confrontation between two or more combatants in which one or more participants are armed with aknife.[1][2] A knife fight is defined by the presence of a knife as a weapon and the violent intent of the combatants to kill or incapacitate each other; the participants may be completely untrained, self-taught, or trained in one or more formal or informal systems of knife fighting.[1][3] Knife fights may involve the use of any type of knife, though certain knives, termedfighting knives, are purposely designed for such confrontations – thedagger being just one example.
During the long history of the knife as a weapon, many systems or schools of knife fighting have developed around the world. Each is usually distinguished by region and culture of their origin. In past centuries the repeated invasion and conquest of foreign territories by invading armies frequently resulted in the dissemination and adoption of knives and knife fighting techniques. These were in turn adapted and improved upon through long practice and drills, sometimes over hundreds of years.
The Italianstiletto, originally a purely offensive weapon used to kill an unsuspecting or wounded adversary, was later embraced throughout Italy as a fighting knife forclose combat confrontations.[4][5] The popularity of the stiletto in theKingdom of Sicily resulted in the development of thescherma di stiletto siciliano (Sicilian school of stiletto fighting).[5] The stiletto was purely a thrusting or stabbing weapon, and thescherma di stiletto siciliano accordingly taught fighting movements designed to avoid the tip of the opponent's blade (scanso). Techniques characteristic of thescherma di stiletto siciliano includesbasso (bending to ground),in quarto tagliata (tacking to left or right), and thebalzo (leap to evade the enemy’s blade).[5] A person skilled in the use of a stiletto would thrust the knife deep into the victim, then twist the blade sharply in various directions before retracting it, causing the sharp point to inflict severe internal damage not readily apparent when examining the entrance wound.[6]

InAndalusian Spain, the use of the largenavaja (folding knife) as a fighting knife has been commonly used by the peoples of that region since the 17th century.[7][8] In that part of Spain, sword and knife fighting techniques (espada y daga) were regularly taught to young men as a necessary skill, often passed down from father to son as a rite of passage to adulthood (and in some cases, to daughters as well).[7][9][10] In 18th- and 19th-century Spainesgrimas de navaja (fencing, or knife-fighting schools) could be found in the major cities and throughout Andalucía, particularly inCórdoba, Málaga, and Seville.[7][8][10] As time went on, these schools began to depart from teaching traditional sword-fighting and fencing techniques in favour of simplified attacks and defences based largely on the concept of deception, distraction, and counterstrike.[11]
Among navajaaficionados, the gamblers orbarateros ofMálaga andSeville were cited as the most skilled practitioners of fighting with the navaja.[7][12][13] The firmly-established knife-fighting tradition with the navaja in Andalusian Spain, especially as reflected in the 19th century treatiseManual del Baratero,[7] would later spread to other Spanish-speaking countries, and was known asel legado Andaluz, or "the Andalusian legacy".[14]
TheEsgrima Criolla ("Creole fencing") method of knife fighting was popularized by the South Americangaucho and his large-bladedfacón. Deprived of their ability to wear a sword by various edicts, Spanish gentlemen in South America adopted the facón,[15] together with fighting techniques developed directly fromel legado Andaluz,[15] including the use of an item of clothing such as aponcho orcloak to protect the weaponless arm.[15][16] The facón was later universally adopted by the gaucho in Argentina, Brazil and Uruguay and later by men of the rural working class of those countries.[17]
Knives similar in style and length to the facón were carried by a wide variety of South American men who were either prohibited from carrying swords or who needed a more convenient, wearable close combat weapon. In an 1828 account of the capture ofLas Damas Argentinas, a pirate schooner carrying a mixed group of Spanish-speaking pirates, the carrying of knives very similar to the facón is mentioned:
"Amongst these [weapons], were a large number of long knives – weapons which the Spaniards use very dexterously. They are about the size of a common English carving knife, but for several inches up the blade cut both sides."[18]
After the turn of the 19th century, the facón became more of a utility and ceremonial weapon, though it was still used to settle arguments "of honor". In these situations two adversaries would attack with slashing attacks to the face, stopping the fight when one of the participants could no longer see due to bleeding from shallow cuts.[19]
Arnis, also referred to as Eskrima and Kali, is an indigenous Philippine martial art involving the use of sticks, knives and other bladed weapons. Like most other knife fighting traditions,Eskrima is learned by constant practice, using sparring encounters between two or more opponents in order to hone a practitioner's physical skills and mental concentration. This martial art flourished for hundreds of years as part of a society with ablade culture, and the system's already impressive indigenous techniques were later directly influenced by Spanish and Andalusian fencing and knife fighting systems with the introduction of theangles of attack and the use ofespada y daga (the wordeskrima is a Filipinization of the Spanish wordesgrima, meaning a fighting or fencing school).[20]

Modern tactics for knife combat were developed by two British members of theShanghai Municipal Police of theInternational Settlement in the 1920s. At the time, the Shanghai streets were rife with criminal activity, exacerbated by the political tensions ofthe time and the breakdown of social order in much of the country.
CaptainWilliam E. Fairbairn and SergeantEric A. Sykes developed knife fighting skills and defenses, which they began teaching to both police recruits and members of the British Army, Royal Marines and U.S. Marine units then stationed inShanghai.[21] Fairbairn reportedly engaged in hundreds of street fights in his twenty-year career in Shanghai, where he organized and headed a special anti-riot squad.[21] Much of his body – arms, legs, torso, and even the palms of his hands – was covered with scars from knife wounds from those fights.[21]
During World War II, Fairbairn and Sykes continued to refine their knife fighting techniques for military and paramilitary forces, teachingBritish Commandos,Special Operations Executive (SOE) personnel, selected American and foreign soldiers and covert espionage personnel, including members of the AmericanOffice of Strategic Services (OSS) and US/UK combinedOperation Jedburgh teams.[21] Their experience in training both soldiers and civilians in quick-kill knife fighting techniques eventually led to the development of a specialized fighting dagger suited for both covert elimination of enemy sentinels and close-combat knife fighting, theFairbairn–Sykes fighting knife, a landmark weapon of its type.

The knife was designed exclusively for surprise attack and fighting, with a slender blade that can easily penetrate aribcage. The vase handle grants precise grip, and the blade's design is especially suited to its use as a fighting knife. Fairbairn's rationale is in his bookGet Tough! (1942).
"In close-quarters fighting there is no more deadly weapon than the knife. In choosing a knife there are two important factors to bear in mind: balance and keenness. The hilt should fit easily in your hand, and the blade should not be so heavy that it tends to drag the hilt from your fingers in a loose grip. It is essential that the blade have a sharp stabbing point and good cutting edges, because an artery torn through (as against a clean cut) tends to contract and stop the bleeding. If a main artery is cleanly severed, the wounded man will quickly lose consciousness and die."[22]
The length of the blade was chosen to give several inches of blade to penetrate the body after passing through the 3 in (7.6 cm) of the thickest clothing that was anticipated to be worn in the war, namely that of Sovietgreatcoats. Later production runs of the F–S fighting knife have a blade length that is about 7.5 in (19 cm).
In all cases, the handle had a distinctivefoil-like grip to enable a number of handling options. Many variations on the F–S fighting knife exist in regards to size of blade and particularly of handle. The design has influenced the design of knives throughout the many decades since its introduction.
There are several ways a knife can be held for offensive or defensive use. The two most common are the forward and reverse grips.

Each grip has advantages and disadvantages. Holding the knife in one of the forward grips allows for more finesse and a longer reach, while a reverse grip allows for more power. The reverse grip is regarded as more difficult to master in knife-on-knife combat, as it may require additional skills in footwork and rapid defensive body movements to offset the increased danger of moving closer to one's opponent and the reach of their blade.
The following are variations of the forward grip:
The following are variations of the reverse grip: