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A or was a covert agent or mercenary in feudal Japan. The functions of a ninja included reconnaissance, espionage,
infiltration Infiltration may refer to: Science, medicine, and engineering *Infiltration (hydrology), downward movement of water into soil *Infiltration (HVAC), a heating, ventilation, and air conditioning term for air leakage into buildings *Infiltration (me ...
,
deception Deception or falsehood is an act or statement that misleads, hides the truth, or promotes a belief, concept, or idea that is not true. It is often done for personal gain or advantage. Deception can involve dissimulation, propaganda and sleight o ...
, ambush,
bodyguard A bodyguard (or close protection officer/operative) is a type of security guard, government law enforcement officer, or servicemember who protects a person or a group of people — usually witnesses, high-ranking public officials or officers, w ...
ing and their fighting skills in
martial arts Martial arts are codified systems and traditions of combat practiced for a number of reasons such as self-defense; military and law enforcement applications; combat sport, competition; physical, mental, and spiritual development; entertainment; a ...
, including ninjutsu.Kawakami, pp. 21–22 Their covert methods of waging
irregular warfare Irregular warfare (IW) is defined in United States joint doctrine as "a violent struggle among state and non-state actors for legitimacy and influence over the relevant populations." Concepts associated with irregular warfare are older than the te ...
were deemed dishonorable and beneath the honor of the samurai. Though ''shinobi'' proper, as specially trained spies and mercenaries, appeared in the 15th century during the Sengoku period, antecedents may have existed as early as the 12th century. In the unrest of the Sengoku period, mercenaries and spies for hire became active in
Iga Province was a province of Japan located in what is today part of western Mie Prefecture. Nussbaum, Louis-Frédéric. (2005). "Iga" in . Its abbreviated name was . Iga is classified as one of the provinces of the Tōkaidō. Under the ''Engishiki'' cl ...
and the adjacent area around the village of Kōga. It is from these areas that much of the knowledge regarding the ninja is drawn. Following the unification of Japan under the Tokugawa shogunate in the 17th century, the ninja faded into obscurity. A number of ''shinobi'' manuals, often based on Chinese military philosophy, were written in the 17th and 18th centuries, most notably the '' Bansenshūkai'' (1676).; based on different readings, ''Ninpiden'' is also known as ''Shinobi Hiden'', and ''Bansenshukai'' can also be ''Mansenshukai''. By the time of the Meiji Restoration (1868), ''shinobi'' had become a topic of popular imagination and mystery in Japan. Ninja figured prominently in legend and folklore, where they were associated with legendary abilities such as invisibility, walking on water and control over natural
elements Element or elements may refer to: Science * Chemical element, a pure substance of one type of atom * Heating element, a device that generates heat by electrical resistance * Orbital elements, parameters required to identify a specific orbit of ...
. Much of their perception in popular culture is based on such legends and folklore, as opposed to the covert actors of the Sengoku period.


Etymology

''Ninja'' is the '' on'yomi'' ( Early Middle Chinese–influenced) reading of the two kanji "忍者". In the native '' kun'yomi'' reading, it is pronounced ''shinobi'', a shortened form of ''shinobi-no-mono'' (忍びの者).Origin of word Ninja
.
The word ''shinobi'' appears in the written record as far back as the late 8th century in poems in the ''
Man'yōshū The is the oldest extant collection of Japanese (poetry in Classical Japanese), compiled sometime after AD 759 during the Nara period. The anthology is one of the most revered of Japan's poetic compilations. The compiler, or the last in ...
''.; the full poem is "''Yorozu yo ni / Kokoro ha tokete / Waga seko ga / Tsumishi te mitsutsu / Shinobi kanetsumo''".; the '' Man'yōgana'' used for "''shinobi'' is 志乃備, its meaning and characters are unrelated to the later mercenary ''shinobi''. The underlying connotation of ''shinobi'' ( ) means "to steal away; to hide" and—by extension—"to forbear", hence its association with stealth and invisibility. ''Mono'' ( ) means "a person". Historically, the word ''ninja'' was not in common use, and a variety of regional
colloquialism Colloquialism (), also called colloquial language, everyday language or general parlance, is the style (sociolinguistics), linguistic style used for casual (informal) communication. It is the most common functional style of speech, the idiom norm ...
s evolved to describe what would later be dubbed ninja. Along with ''shinobi'', these include ''monomi'' ("one who sees"), ''nokizaru'' ("
macaque The macaques () constitute a genus (''Macaca'') of gregarious Old World monkeys of the subfamily Cercopithecinae. The 23 species of macaques inhabit ranges throughout Asia, North Africa, and (in one instance) Gibraltar. Macaques are principally ...
on the roof"), ''rappa'' ("ruffian"), ''kusa'' ("grass") and ''Iga-mono'' ("one from Iga"). In historical documents, ''shinobi'' is almost always used. '' Kunoichi'' (くノ一)is, originally, an argot which means "woman"; it supposedly comes from the characters くノ一 (respectively hiragana ''ku'', katakana ''no'' and kanji ''ichi''), which make up the three strokes that form the kanji for "woman" (女). In fiction written in the modern era ''kunoichi'' means "female ninja". In the Western world, the word ''ninja'' became more prevalent than ''shinobi'' in the post– World War II culture, possibly because it was more comfortable for Western speakers. In English, the plural of ''ninja'' can be either unchanged as ''ninja'', reflecting the Japanese language's lack of grammatical number, or the regular English plural ''ninjas''.


History

Despite many popular folktales, historical accounts of the ninja are scarce. Historian Stephen Turnbull asserts that the ninja were mostly recruited from the lower class, and therefore little literary interest was taken in them. The social origin of the ninja is seen as the reason they agree to operate in secret, trading their service for money without honor and glory. The scarcity of historical accounts is also demonstrated in war epics such as '' The Tale of Hōgen'' ''(Hōgen Monogatari)'' and '' The Tale of the Heike'' ''(Heike Monogatari)'', which focus mainly on the aristocratic samurai, whose deeds were apparently more appealing to the audience. Historian Kiyoshi Watatani states that the ninja were trained to be particularly secretive about their actions and existence: However, some ''ninjutsu'' books described specifically what tactics ninja should use to fight, and the scenarios a ninja might find themselves can be deduced from those tactics. For example, in the manuscript of volume 2 of ''Kanrin Seiyō'' (間林清陽) which is the original book of ''Bansenshūkai'' (万川集海), there are 48 points of ninja's fighting techniques, such as how to make '' makibishi'' from bamboo, how to make footwear that makes no sound, fighting techniques when surrounded by many enemies, precautions when using swords at night, how to listen to small sounds, '' kuji-kiri'' that prevents guard dogs from barking, and so on.


Predecessors

The title ''ninja'' has sometimes been attributed retrospectively to the semi-legendary 4th-century prince Yamato Takeru. In the ''
Kojiki The , also sometimes read as or , is an early Japanese chronicle of myths, legends, hymns, genealogies, oral traditions, and semi-historical accounts down to 641 concerning the origin of the Japanese archipelago, the , and the Japanese imperia ...
'', the young Yamato Takeru disguised himself as a charming maiden and assassinated two chiefs of the Kumaso people.; Volume 2, section 80 However, these records take place at a very early stage of Japanese history, and they are unlikely to be connected to the ''shinobi'' of later accounts. The first recorded use of espionage was under the employment of Prince Shōtoku in the 6th century. Such tactics were considered unsavory even in early times, when, according to the 10th-century ''Shōmonki'', the boy spy
Hasetsukabe no Koharumaru (died 938) was a boy spy of Heian period Japan. He is known from the 10th century military chronicle '' Shōmonki''. Recruited to spy against his lord, the rebel Taira no Masakado, he was ultimately discovered and killed. Enlistment According ...
was killed for spying against the insurgent Taira no Masakado. Later, the 14th-century war chronicle '' Taiheiki'' contained many references to ''shinobi'' and credited the destruction of a castle by fire to an unnamed but "highly skilled ''shinobi''".


Early history

It was not until the 15th century that spies were specially trained for their purpose. It was around this time that the word ''shinobi'' appeared to define and clearly identify ninja as a secretive group of agents. Evidence for this can be seen in historical documents, which began to refer to stealthy soldiers as ''shinobi'' during the Sengoku period. Later manuals regarding espionage are often grounded in Chinese
military strategy Military strategy is a set of ideas implemented by military organizations to pursue desired strategic goals. Derived from the Greek word '' strategos'', the term strategy, when it appeared in use during the 18th century, was seen in its narrow s ...
, quoting works such as '' The Art of War'' by Sun Tzu. The ninja emerged as mercenaries in the 15th century, where they were recruited as spies, raiders, arsonists and even terrorists. Amongst the samurai, a sense of ritual and decorum was observed, where one was expected to fight or
duel A duel is an arranged engagement in combat between two people, with matched weapons, in accordance with agreed-upon Code duello, rules. During the 17th and 18th centuries (and earlier), duels were mostly single combats fought with swords (the r ...
openly. Combined with the unrest of the Sengoku period, these factors created a demand for men willing to commit deeds considered disreputable for conventional warriors. By the Sengoku period, the ''shinobi'' had several roles, including spy (''kanchō''),
scout Scout may refer to: Youth movement *Scout (Scouting), a child, usually 10–18 years of age, participating in the worldwide Scouting movement **Scouts (The Scout Association), section for 10-14 year olds in the United Kingdom **Scouts BSA, sectio ...
(''teisatsu''), surprise attacker (''kishu''), and agitator (''konran''). The ninja families were organized into larger guilds, each with their own territories. A system of rank existed. A ''jōnin'' ("upper person") was the highest rank, representing the group and hiring out mercenaries. This is followed by the ''chūnin'' ("middle person"), assistants to the ''jōnin''. At the bottom was the ''genin'' ("lower person"), field agents drawn from the lower class and assigned to carry out actual missions.


Iga and Kōga clans

The Iga and Kōga clans have come to describe families living in the province of
Iga Iga may refer to: Arts and entertainment * Ambush at Iga Pass, a 1958 Japanese film * Iga no Kagemaru, Japanese manga series * Iga, a set of characters from the Japanese novel '' The Kouga Ninja Scrolls'' Biology * ''Iga'' (beetle), a gen ...
(modern Mie Prefecture) and the adjacent region of
Kōka was a after ''Tenpō'' and before ''Kaei.'' This period spanned the years from December 1844 through February 1848. The reigning emperors were and . Change of era * December 2, 1844 (): The new era name of ''Kōka'', meaning "Becoming Wide ...
(later written as ''Kōga''), named after a village in what is now Shiga Prefecture. From these regions, villages devoted to the training of ninja first appeared. The remoteness and inaccessibility of the surrounding mountains may have had a role in the ninja's secretive development. Historical documents regarding the ninja's origins in these mountainous regions are considered generally correct. The chronicle ''Go Kagami Furoku'' writes, of the two clans' origins: Likewise, a supplement to the ''Nochi Kagami'', a record of the Ashikaga shogunate, confirms the same Iga origin: A distinction is to be made between the ninja from these areas, and commoners or samurai hired as spies or mercenaries. Unlike their counterparts, the Iga and Kōga clans produced professional ninja, specifically trained for their roles. These professional ninja were actively hired by '' daimyōs'' between 1485 and 1581, until
Oda Nobunaga was a Japanese ''daimyō'' and one of the leading figures of the Sengoku period. He is regarded as the first "Great Unifier" of Japan. Nobunaga was head of the very powerful Oda clan, and launched a war against other ''daimyō'' to unify ...
invaded Iga Province and wiped out the organized clans. Survivors were forced to flee, some to the mountains of Kii, but others arrived before Tokugawa Ieyasu, where they were well treated. Some former Iga clan members, including Hattori Hanzō, would later serve as Tokugawa's bodyguards. Following the Battle of Okehazama in 1560, Tokugawa employed a group of eighty Kōga ninja, led by Tomo Sukesada. They were tasked to raid an outpost of the Imagawa clan. The account of this assault is given in the ''Mikawa Go Fudoki'', where it was written that Kōga ninja infiltrated the castle, set fire to its towers, and killed the
castellan A castellan is the title used in Medieval Europe for an appointed official, a governor of a castle and its surrounding territory referred to as the castellany. The title of ''governor'' is retained in the English prison system, as a remnant o ...
along with two hundred of the garrison. The Kōga ninja are said to have played a role in the later
Battle of Sekigahara The Battle of Sekigahara (Shinjitai: ; Kyūjitai: , Hepburn romanization: ''Sekigahara no Tatakai'') was a decisive battle on October 21, 1600 (Keichō 5, 15th day of the 9th month) in what is now Gifu prefecture, Japan, at the end of ...
(1600), where several hundred Kōga assisted soldiers under Torii Mototada in the defence of
Fushimi Castle , also known as or Fushimi-Momoyama Castle, is a Japanese castle located in Fushimi Ward, Kyoto. Fushimi Castle was constructed from 1592 to 1594 by Toyotomi Hideyoshi at the end of the Sengoku period as his retirement residence. Fushimi Castle ...
. After Tokugawa's victory at Sekigahara, the Iga acted as guards for the inner compounds of
Edo Castle is a flatland castle that was built in 1457 by Ōta Dōkan in Edo, Toshima District, Musashi Province. In modern times it is part of the Tokyo Imperial Palace in Chiyoda, Tokyo and is therefore also known as . Tokugawa Ieyasu established the ...
, while the Kōga acted as a police force and assisted in guarding the outer gate. In 1614, the initial "winter campaign" at the Siege of Osaka saw the ninja in use once again. Miura Yoemon, a ninja in Tokugawa's service, recruited ''shinobi'' from the Iga region, and sent 10 ninja into Osaka Castle in an effort to foster antagonism between enemy commanders. During the later "summer campaign", these hired ninja fought alongside regular troops at the
Battle of Tennōji The was fought on 3 June, 1615 between the forces of Tokugawa Ieyasu and Toyotomi Hideyori. Tokugawa was besieging Osaka, and Hideyori had planned a counterattack. Both sides were plagued by mistakes until Hideyori's side finally fell. He pre ...
.


Shimabara rebellion

A final but detailed record of ninja employed in open warfare occurred during the
Shimabara Rebellion The , also known as the or , was an uprising that occurred in the Shimabara Domain of the Tokugawa Shogunate in Japan from 17 December 1637 to 15 April 1638. Matsukura Katsuie, the ''daimyō'' of the Shimabara Domain, enforced unpopular polic ...
(1637–1638). The Kōga ninja were recruited by '' shōgun'' Tokugawa Iemitsu against
Christian Christians () are people who follow or adhere to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. The words ''Christ'' and ''Christian'' derive from the Koine Greek title ''Christós'' (Χρι ...
rebels led by Amakusa Shirō, who made a final stand at Hara Castle, in Hizen Province. A diary kept by a member of the Matsudaira clan, the ''Amakusa Gunki'', relates: "Men from Kōga in Ōmi Province who concealed their appearance would steal up to the castle every night and go inside as they pleased." The Ukai diary, written by a descendant of Ukai Kanemon, has several entries describing the reconnaissance actions taken by the Kōga. Suspecting that the castle's supplies might be running low, the siege commander
Matsudaira Nobutsuna was a Japanese ''daimyō'' of the early Edo period, who ruled the Kawagoe Domain. First serving Tokugawa Iemitsu as a page, Nobutsuna was renowned for his sagacity. He was named a rōjū in 1633. Nobutsuna led the shogunal forces to their final vi ...
ordered a raid on the castle's provisions. Here, the Kōga captured bags of enemy provisions, and infiltrated the castle by night, obtaining secret passwords. Days later, Nobutsuna ordered an intelligence gathering mission to determine the castle's supplies. Several Kōga ninja—some apparently descended from those involved in the 1562 assault on an Imagawa clan castle—volunteered despite being warned that chances of survival were slim. A volley of shots was fired into the sky, causing the defenders to extinguish the castle lights in preparation. Under the cloak of darkness, ninja disguised as defenders infiltrated the castle, capturing a banner of the Christian cross. The Ukai diary writes, As the siege went on, the extreme shortage of food later reduced the defenders to eating
moss Mosses are small, non-vascular flowerless plants in the taxonomic division Bryophyta (, ) '' sensu stricto''. Bryophyta (''sensu lato'', Schimp. 1879) may also refer to the parent group bryophytes, which comprise liverworts, mosses, and hor ...
and grass. This desperation would mount to futile charges by the rebels, where they were eventually defeated by the shogunate army. The Kōga would later take part in conquering the castle: With the fall of Hara Castle, the Shimabara Rebellion came to an end, and Christianity in Japan was forced
underground Underground most commonly refers to: * Subterranea (geography), the regions beneath the surface of the Earth Underground may also refer to: Places * The Underground (Boston), a music club in the Allston neighborhood of Boston * The Underground (S ...
. These written accounts are the last mention of ninja in war.


Edo period

After the Shimabara Rebellion, there were almost no major wars or battles until the '' bakumatsu'' era. To earn a living, ninja had to be employed by the governments of their ''
Han Han may refer to: Ethnic groups * Han Chinese, or Han People (): the name for the largest ethnic group in China, which also constitutes the world's largest ethnic group. ** Han Taiwanese (): the name for the ethnic group of the Taiwanese p ...
'' (domain), or change their profession. Many lords still hired ninja, not for battle but as bodyguards or spies. Their duties included spying on other domains, guarding the daimyō, and fire patrol. A few domains like Tsu,
Hirosaki is a city located in western Aomori Prefecture, Japan. On 1 April 2020, the city had an estimated population of 168,739 in 71,716 households, and a population density of . The total area of the city is . Hirosaki developed as a castle town for ...
and
Saga is a series of science fantasy role-playing video games by Square Enix. The series originated on the Game Boy in 1989 as the creation of Akitoshi Kawazu at Square (video game company), Square. It has since continued across multiple platforms, ...
continued to employ their own ninja into the ''bakumatsu'' era, although their precise numbers are unknown. Many former ninja were employed as security guards by the Tokugawa shogunate, though the role of espionage was transferred to newly created organizations like the ''Onmitsu'' and the '' Oniwaban''. Others used their ''ninjutsu'' knowledge to become doctors, medicine sellers, merchants, martial artists, and fireworks manufacturers. Some unemployed ninja were reduced to banditry, such as
Fūma Kotarō was the name adopted by the leader of the ninja during the Sengoku era of feudal Japan. He was retainer of Later Hōjō clan. According to some records, his name was originally Kazama Kotarō (風間 小太郎). The Fūma clan and Fūma Kota ...
and Ishikawa Goemon.


Contemporary

Between 1960 and 2010 artifacts dating to the Siege of Odawara (1590) were uncovered which experts say are ninja weapons. Ninja were spies and saboteurs and likely participated in the siege. The
Hojo clan Hojo or Hōjō may refer to: Hojo or HoJo: *Howard Johnson's, a U.S. chain of restaurants and hotels *A nickname for Howard Johnson *A nickname for Howard Jones *A nickname for Howard Jones *MGR-1 Honest John, the first nuclear-capable missile ...
failed to save the castle from Toyotomi Hideyoshi forces. The uncovered flat throwing stones are likely predecessors of the shuriken. The clay caltrops preceded makibishi caltrops. Archeologist Iwata Akihiro of
Saitama Prefectural Museum of History and Folklore is a prefectural museum in Saitama, Japan, dedicated to the history and folklore of Saitama Prefecture. The museum opened in 1971. See also * Chichibu Province * Musashi Province was a province of Japan, which today comprises Tokyo Metropol ...
said the flat throwing stones "were used to stop the movement of the enemy who was going to attack soldierat any moment, and while the enemy freezed the soldier escaped,". The clay caltrops could "stop the movement of the enemy who invaded the castle," These weapons were hastily constructed yet effective and used by a "battle group which can move into action as ninjas".
Mie University Mie University (三重大学; ''Mie Daigaku'', abbreviated to 三重大 ''Miedai'') is a national university in Tsu, Mie Prefecture, Japan. As with other national universities, Mie University has been a National University Corporation since Apr ...
founded the world's first research centre devoted to the ninja in 2017. A graduate master course opened in 2018. It is located in
Iga Iga may refer to: Arts and entertainment * Ambush at Iga Pass, a 1958 Japanese film * Iga no Kagemaru, Japanese manga series * Iga, a set of characters from the Japanese novel '' The Kouga Ninja Scrolls'' Biology * ''Iga'' (beetle), a gen ...
(now Mie Prefecture). There are approximately 3 student enrollments per year. Students must pass an admission test about Japanese history and be able to read historical ninja documents. Scientific researchers and scholars of different disciplines study ancient documents and how it can be used in the modern world. In 2020, the 45-year-old Genichi Mitsuhashi was the first student to graduate from the master course of ninja studies at Mie University. For 2 years he studied historical records and the traditions of the martial art. Similar to the original ninja, by day he was a farmer and grew vegetables while he did ninja studies and trained martial arts in the afternoon. On June 19, 2022,
Kōka was a after ''Tenpō'' and before ''Kaei.'' This period spanned the years from December 1844 through February 1848. The reigning emperors were and . Change of era * December 2, 1844 (): The new era name of ''Kōka'', meaning "Becoming Wide ...
city in Shiga Prefecture announced that a written copy of "Kanrinseiyo", which is the original source of a famous book on the art of ninja called "Bansenshukai" (1676) from the Edo period was discovered in a warehouse of Kazuraki Shrine. The handwritten reproduction was produced in 1748. The book describes 48 types of ninjutsu. It has information about specific methods such as attaching layers of cotton to the bottom of straw sandals to prevent noise when sneaking around, attacking to the right when surrounded by a large number of enemies, throwing charred owl and turtle powder when trying to hide, and casting spells. It also clarified methods and how to manufacture and use ninjutsu tools, such as cane swords and "makibishi" (Japanese caltrop).


''Oniwaban''

In the early 18th century,
shogun , officially , was the title of the military dictators of Japan during most of the period spanning from 1185 to 1868. Nominally appointed by the Emperor, shoguns were usually the de facto rulers of the country, though during part of the Kamakur ...
Tokugawa Yoshimune founded the ''oniwaban'' ("garden keepers"), an intelligence agency and
secret service A secret service is a government agency, intelligence agency, or the activities of a government agency, concerned with the gathering of intelligence data. The tasks and powers of a secret service can vary greatly from one country to another. For ...
. Members of the ''oniwaban'' were agents involved in collecting information on '' daimyō'' and government officials. The secretive nature of the ''oniwaban''—along with the earlier tradition of using Iga and Kōga clan members as palace guards—have led some sources to define the ''oniwabanshū'' as "ninja". This portrayal is also common in later novels and '' jidaigeki''. However, there is no written link between the earlier ''shinobi'' and the later ''oniwaban''.


Roles

The ninja were stealth soldiers and mercenaries hired mostly by '' daimyōs''. Their primary roles were those of espionage and sabotage, although assassinations were also attributed to ninja. Although they were considered the anti-samurai and were disdained by those belonging to the samurai class, they were necessary for warfare and were even employed by the samurai themselves to carry out operations that were forbidden by '' bushidō''. In his ''Buke Myōmokushō'', military historian Hanawa Hokinoichi writes of the ninja:


Espionage

Espionage was the chief role of the ninja. With the aid of disguises, the ninja gathered information on enemy terrain and building specifications, as well as obtaining passwords and communiques. The aforementioned supplement to the ''Nochi Kagami'' briefly describes the ninja's role in espionage: Later in history, the Kōga ninja would become regarded as agents of the Tokugawa '' bakufu'', at a time when the ''bakufu'' used the ninja in an intelligence network to monitor regional ''daimyōs'' as well as the Imperial court.


Sabotage

Arson was the primary form of sabotage practiced by the ninja, who targeted castles and camps. The ''Tamon-in Nikki'' (16th century)—a diary written by abbot Eishun of Kōfuku-ji temple—describes an arson attack on a castle by men of the Iga clans. In 1558, Rokkaku Yoshikata employed a team of ninja to set fire to Sawayama Castle. A ''chūnin'' captain led a force of 48 ninja into the castle by means of deception. In a technique dubbed ''bakemono-jutsu'' ("ghost technique"), his men stole a lantern bearing the enemy's family crest (''
mon Mon, MON or Mon. may refer to: Places * Mon State, a subdivision of Myanmar * Mon, India, a town in Nagaland * Mon district, Nagaland * Mon, Raebareli, a village in Uttar Pradesh, India * Mon, Switzerland, a village in the Canton of Grisons * An ...
''), and proceeded to make replicas with the same ''mon''. By wielding these lanterns, they were allowed to enter the castle without a fight. Once inside, the ninja set fire to the castle, and Yoshitaka's army would later emerge victorious. The mercenary nature of the ''shinobi'' is demonstrated in another arson attack soon after the burning of Sawayama Castle. In 1561, commanders acting under
Kizawa Nagamasa Kizawa Nagamasa (木沢長政) was a ''daimyō'' of the Sengoku period in Japan. Nagamasa built Shigisan Castle for the Hatakeyama clan in 1536, an accomplishment that earned him the title of ''shugo'' of Yamato Province. In 1561 he expanded into ...
hired three Iga ninja of ''genin'' rank to assist the conquest of a fortress in
Maibara is a city in Shiga Prefecture, Japan. , the city had an estimated population of 38,259 in 14761 households and a population density of 150 persons per km². The total area of the city is . Geography Maibara is located in northcentral Shiga Pr ...
. Rokkaku Yoshitaka, the same man who had hired Iga ninja just years earlier, was the fortress holder—and target of attack. The ''Asai Sandaiki'' writes of their plans: "We employed ''shinobi-no-mono'' of Iga... They were contracted to set fire to the castle". However, the mercenary ''shinobi'' were unwilling to take commands. When the fire attack did not begin as scheduled, the Iga men told the commanders, who were not from the region, that they could not possibly understand the tactics of the ''shinobi''. They then threatened to abandon the operation if they were not allowed to act on their own strategy. The fire was eventually set, allowing Nagamasa's army to capture the fortress in a chaotic rush.


Assassination

The best-known cases of assassination attempts involve famous historical figures. Deaths of famous persons have sometimes been attributed to assassination by ninja, but the secretive natures of these scenarios have made them difficult to prove. Assassins were often identified as ninja later on, but there is no evidence to prove whether some were specially trained for the task or simply a hired thug. The warlord
Oda Nobunaga was a Japanese ''daimyō'' and one of the leading figures of the Sengoku period. He is regarded as the first "Great Unifier" of Japan. Nobunaga was head of the very powerful Oda clan, and launched a war against other ''daimyō'' to unify ...
's notorious reputation led to several attempts on his life. In 1571, a Kōga ninja and sharpshooter by the name of Sugitani Zenjubō was hired to assassinate Nobunaga. Using two arquebuses, he fired two consecutive shots at Nobunaga, but was unable to inflict mortal injury through Nobunaga's armor. Sugitani managed to escape, but was caught four years later and put to death by torture. In 1573, Manabe Rokurō, a vassal of ''daimyō'' Hatano Hideharu, attempted to infiltrate Azuchi Castle and assassinate the sleeping Nobunaga. However, this also ended in failure, and Manabe was forced to commit suicide, after which his body was openly displayed in public. According to a document, the ''Iranki'', when Nobunaga was inspecting Iga province—which his army had devastated—a group of three ninja shot at him with large-caliber firearms. The shots flew wide of Nobunaga, however, and instead killed seven of his surrounding companions. The ninja Hachisuka Tenzō was sent by Nobunaga to assassinate the powerful ''daimyō'' Takeda Shingen, but ultimately failed in his attempts. Hiding in the shadow of a tree, he avoided being seen under the moonlight, and later concealed himself in a hole he had prepared beforehand, thus escaping capture. An assassination attempt on Toyotomi Hideyoshi was also thwarted. A ninja named
Kirigakure Saizō was a legendary ninja of the final phase of the Sengoku period of Japan. In the folklore he is one of the Sanada Ten Braves, and next to Sarutobi Sasuke, he is the most recognized of the Ten. As in the case of Sasuke, Saizō might be a fictional ...
(possibly Kirigakure Shikaemon) thrust a spear through the floorboards to kill Hideyoshi, but was unsuccessful. He was "smoked out" of his hiding place by another ninja working for Hideyoshi, who apparently used a sort of primitive "
flamethrower A flamethrower is a ranged incendiary device designed to project a controllable jet of fire. First deployed by the Byzantine Empire in the 7th century AD, flamethrowers saw use in modern times during World War I, and more widely in World ...
". Unfortunately, the veracity of this account has been clouded by later fictional publications depicting Saizō as one of the legendary
Sanada Ten Braves The are a legendary group of ninja that assisted the warlord Sanada Yukimura during the Warring States era of Japan; that is, the late Sengoku period and its immediate aftermath, also known as the Azuchi–Momoyama and the early Edo periods. Th ...
. Uesugi Kenshin, the famous ''daimyō'' of
Echigo Province was an old province in north-central Japan, on the shores of the Sea of Japan. It bordered on Uzen, Iwashiro, Kōzuke, Shinano, and Etchū Provinces. Nussbaum, Louis-Frédéric. (2005). "''Echigo''" in . It corresponds today to Niigata ...
, was rumored to have been killed by a ninja. The legend credits his death to an assassin who is said to have hidden in Kenshin's lavatory, and fatally injured Kenshin by thrusting a blade or spear into his
anus The anus (Latin, 'ring' or 'circle') is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, the residual semi-solid waste that remains after food digestion, which, d ...
. While historical records showed that Kenshin suffered abdominal problems, modern historians have generally attributed his death to
stomach cancer Stomach cancer, also known as gastric cancer, is a cancer that develops from the lining of the stomach. Most cases of stomach cancers are gastric carcinomas, which can be divided into a number of subtypes, including gastric adenocarcinomas. Lymph ...
,
esophageal cancer Esophageal cancer is cancer arising from the esophagus—the food pipe that runs between the throat and the stomach. Symptoms often include difficulty in swallowing and weight loss. Other symptoms may include pain when swallowing, a hoarse voice ...
, or cerebrovascular disease.


Psychological warfare

In battle, the ninja were also used to cause confusion amongst the enemy. A degree of psychological warfare in the capturing of enemy banners can be seen illustrated in the ''Ōu Eikei Gunki'', composed between the 16th and 17th centuries:


Countermeasures

A variety of countermeasures were taken to prevent the activities of the ninja. Precautions were often taken against assassinations, such as weapons concealed in the lavatory, or under a removable floorboard. Buildings were constructed with traps and trip wires attached to alarm bells. Japanese castles were designed to be difficult to navigate, with winding routes leading to the inner compound. Blind spots and holes in walls provided constant surveillance of these labyrinthine paths, as exemplified in Himeji Castle. Nijō Castle in Kyoto is constructed with long "nightingale" floors, which rested on metal hinges (''uguisu-bari'') specifically designed to squeak loudly when walked over. Grounds covered with
gravel Gravel is a loose aggregation of rock fragments. Gravel occurs naturally throughout the world as a result of sedimentary and erosive geologic processes; it is also produced in large quantities commercially as crushed stone. Gravel is classifi ...
also provided early notice of unwanted intruders, and segregated buildings allowed fires to be better contained.


Training

The skills required of the ninja have come to be known in modern times as , but it is unlikely they were previously named under a single discipline, rather distributed among a variety of espionage and
survival skills Survival skills are techniques that a person may use in order to sustain life in any type of natural environment or built environment. These techniques are meant to provide basic necessities for human life which include water, food, and shelte ...
. Some view ''ninjutsu'' as evidence that ninja were not simple mercenaries because texts contained not only information on combat training, but also information about daily needs, which even included mining techniques. The guidance provided for daily work also included elements that enable the ninja to understand the martial qualities of even the most menial task. These factors show how the ''ninjutsu'' established among the ninja class the fundamental principle of
adaptation In biology, adaptation has three related meanings. Firstly, it is the dynamic evolutionary process of natural selection that fits organisms to their environment, enhancing their evolutionary fitness. Secondly, it is a state reached by the po ...
. The first specialized training began in the mid-15th century, when certain samurai families started to focus on covert warfare, including espionage and assassination. Like the samurai, ninja were born into the profession, where traditions were kept in, and passed down through the family. According to Turnbull, the ninja was trained from childhood, as was also common in samurai families. Outside the expected martial art disciplines, a youth studied survival and scouting techniques, as well as information regarding
poison Poison is a chemical substance that has a detrimental effect to life. The term is used in a wide range of scientific fields and industries, where it is often specifically defined. It may also be applied colloquially or figuratively, with a broa ...
s and
explosive An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An expl ...
s. Physical training was also important, which involved long-distance runs, climbing, stealth methods of walking and swimming. A certain degree of knowledge regarding common professions was also required if one was expected to take their form in disguise. Some evidence of medical training can be derived from one account, where an Iga ninja provided first-aid to Ii Naomasa, who was injured by gunfire in the
Battle of Sekigahara The Battle of Sekigahara (Shinjitai: ; Kyūjitai: , Hepburn romanization: ''Sekigahara no Tatakai'') was a decisive battle on October 21, 1600 (Keichō 5, 15th day of the 9th month) in what is now Gifu prefecture, Japan, at the end of ...
. Here the ninja reportedly gave Naomasa a "black medicine" meant to stop bleeding. With the fall of the Iga and Kōga clans, '' daimyōs'' could no longer recruit professional ninja, and were forced to train their own ''shinobi''. The ''shinobi'' was considered a real profession, as demonstrated in the 1649 '' bakufu'' law on military service, which declared that only ''daimyōs'' with an income of over 10,000 ''
koku The is a Chinese-based Japanese unit of volume. 1 koku is equivalent to 10 or approximately , or about . It converts, in turn, to 100 shō and 1000 gō. One ''gō'' is the volume of the "rice cup", the plastic measuring cup that is supplied ...
'' were allowed to retain ''shinobi''. In the two centuries that followed, a number of ''ninjutsu'' manuals were written by descendants of Hattori Hanzō as well as members of the Fujibayashi clan, an offshoot of the Hattori. Major examples include the ''
Ninpiden The ''Ninpiden'' (a.k.a. ''Shinobi Hiden'', or ''Legends of Ninja Secrets'') is an authentic ninjutsu manual written by Hattori Hanzō in 1560. It is regarded as one of the three key historical texts of ninjutsu, along with the ''Shōninki The ''Sh ...
'' (1655), the '' Bansenshūkai'' (1675), and the '' Shōninki'' (1681). Modern schools that claim to train ''ninjutsu'' arose from the 1970s, including that of Masaaki Hatsumi ( Bujinkan), Stephen K. Hayes (
To-Shin Do To-Shin Do is a martial art founded by Black Belt Hall of Fame instructor Stephen K. Hayes in 1997. It is a modernized version of ninjutsu, and differs from the traditional form taught by Masaaki Hatsumi’s Bujinkan organization. Instruction f ...
), and
Jinichi Kawakami Jinichi Kawakami (川上仁一) b. 1949, head of Banke Shinobinoden, is the last ''sōke'' and only heir to authentic ninjutsu. He says he is the 21st head of the Koga Ban family ( Iga and Koga Ninjutsu), a mercenary, and the honorary director of t ...
(Banke Shinobinoden). The lineage and authenticity of these schools are a matter of controversy.


Tactics

The ninja did not always work alone. Teamwork techniques exist: For example, in order to scale a wall, a group of ninja may carry each other on their backs, or provide a human platform to assist an individual in reaching greater heights. The ''Mikawa Go Fudoki'' gives an account where a coordinated team of attackers used passwords to communicate. The account also gives a case of deception, where the attackers dressed in the same clothes as the defenders, causing much confusion. When a retreat was needed during the Siege of Osaka, ninja were commanded to fire upon friendly troops from behind, causing the troops to charge backwards to attack a perceived enemy. This tactic was used again later on as a method of crowd dispersal. Most ''ninjutsu'' techniques recorded in scrolls and manuals revolve around ways to avoid detection, and methods of escape. These techniques were loosely grouped under corresponding natural elements. Some examples are: * ''Hitsuke'': The practice of distracting guards by starting a fire away from the ninja's planned point of entry. Falls under "fire techniques" (''katon-no-jutsu''). * ''Tanuki-gakure'': The practice of climbing a tree and camouflaging oneself within the foliage. Falls under "wood techniques" (''mokuton-no-jutsu''). * ''Ukigusa-gakure'': The practice of throwing
duckweed Lemnoideae is a subfamily of flowering aquatic plants, known as duckweeds, water lentils, or water lenses. They float on or just beneath the surface of still or slow-moving bodies of fresh water and wetlands. Also known as bayroot, they arose ...
over water to conceal underwater movement. Falls under "water techniques" (''suiton-no-jutsu''). * ''Uzura-gakure'': The practice of curling into a ball and remaining motionless to appear like a stone. Falls under "earth techniques" (''doton-no-jutsu'').


Disguises

The use of disguises is common and well documented. Disguises came in the form of priests, entertainers, fortune tellers, merchants, '' rōnin'', and monks. The ''Buke Myōmokushō'' states, A mountain ascetic ('' yamabushi'') attire facilitated travel, as they were common and could travel freely between political boundaries. The loose robes of Buddhist priests also allowed concealed weapons, such as the '' tantō''. Minstrel or '' sarugaku'' outfits could have allowed the ninja to spy in enemy buildings without rousing suspicion. Disguises as a ''
komusō The (also romanized or ) were a group of Japanese mendicant monks of the Fuke school of Zen Buddhism who flourished during the Edo period (1603–1867). were characterized by a straw basket (a sedge or reed hood known as a ) worn on the h ...
'', a mendicant monk known for playing the ''
shakuhachi A is a Japanese and ancient Chinese longitudinal, end-blown flute that is made of bamboo. The bamboo end-blown flute now known as the was developed in Japan in the 16th century and is called the .
'', were also effective, as the large "basket" hats traditionally worn by them concealed the head completely.


Equipment

Ninja used a large variety of tools and weaponry, some of which were commonly known, but others were more specialized. Most were tools used in the infiltration of castles. A wide range of specialized equipment is described and illustrated in the 17th-century '' Bansenshūkai'', including climbing equipment, extending spears, rocket-propelled arrows, and small collapsible boats.


Outerwear

While the image of a ninja clad in black garb (shinobi shōzoku) is prevalent in popular media, there is no written evidence for such attire. Instead, it was much more common for the ninja to be disguised as civilians. The popular notion of black clothing is likely rooted in artistic convention; early drawings of ninja showed them dressed in black to portray a sense of invisibility.; Turnbull uses the name ''Buke Meimokushō'', an alternate reading for the same title. The ''Buke Myōmokushō'' cited here is a much more common reading. This convention was an idea borrowed from the puppet handlers of '' bunraku'' theater, who dressed in total black in an effort to simulate
prop A prop, formally known as (theatrical) property, is an object used on stage or screen by actors during a performance or screen production. In practical terms, a prop is considered to be anything movable or portable on a stage or a set, distinct ...
s moving independently of their controls. Despite the lack of hard evidence, it has been put forward by some authorities that black robes, perhaps slightly tainted with red to hide bloodstains, was indeed the sensible garment of choice for infiltration. Clothing used was similar to that of the samurai, but loose garments (such as leggings) were tucked into trousers or secured with belts. The '' tenugui'', a piece of cloth also used in martial arts, had many functions. It could be used to cover the face, form a belt, or assist in climbing. The historicity of armor specifically made for ninja cannot be ascertained. While pieces of light armor purportedly worn by ninja exist and date to the right time, there is no hard evidence of their use in ninja operations. Depictions of famous persons later deemed ninja often show them in
samurai armor Scholars agree that Japanese armour first appeared in the 4th century, with the discovery of the cuirass and basic helmets in graves. During the ''Heian period'' (794-1185), the unique Japanese samurai armour ''ō-yoroi'' and ''dō-maru'' appeare ...
. There were lightweight concealable types of armour made with ''kusari'' (chain armour) and small armor plates such as ''karuta'' that could have been worn by ninja including ''katabira'' (jackets) made with armour hidden between layers of cloth. Shin and arm guards, along with metal-reinforced hoods are also speculated to make up the ninja's armor.


Tools

Tools used for infiltration and espionage are some of the most abundant artifacts related to the ninja. Ropes and
grappling hook A grappling hook or grapnel is a device that typically has multiple hooks (known as ''claws'' or ''flukes'') attached to a rope; it is thrown, dropped, sunk, projected, or fastened directly by hand to where at least one hook may catch and hol ...
s were common, and were tied to the belt. A collapsible ladder is illustrated in the ''Bansenshukai'', featuring spikes at both ends to anchor the ladder. Spiked or hooked climbing gear worn on the hands and feet also doubled as weapons. Other implements include
chisel A chisel is a tool with a characteristically shaped cutting edge (such that wood chisels have lent part of their name to a particular grind) of blade on its end, for carving or cutting a hard material such as wood, stone, or metal by hand, stru ...
s,
hammer A hammer is a tool, most often a hand tool, consisting of a weighted "head" fixed to a long handle that is swung to deliver an impact to a small area of an object. This can be, for example, to drive nails into wood, to shape metal (as w ...
s,
drill A drill is a tool used for making round holes or driving fasteners. It is fitted with a bit, either a drill or driverchuck. Hand-operated types are dramatically decreasing in popularity and cordless battery-powered ones proliferating due to ...
s, picks, and so forth. The '' kunai'' was a heavy pointed tool, possibly derived from the Japanese masonry trowel, which it closely resembles. Although it is often portrayed in popular culture as a weapon, the ''kunai'' was primarily used for gouging holes in walls. Knives and small saws (''hamagari'') were also used to create holes in buildings, where they served as a foothold or a passage of entry. A portable listening device (''saoto hikigane'') was used to eavesdrop on conversations and detect sounds. The ''
mizugumo Mizu gumo ( ja, 水蜘蛛, lit=water spider) was a water crossing device used by ninja. In one description a device was worn like a harness around the hips and had small air pockets to keep the ninja afloat. Another description says that two were u ...
'' was a set of wooden shoes supposedly allowing the ninja to walk on water. They were meant to work by distributing the wearer's weight over the shoes' wide bottom surface. The word ''mizugumo'' is derived from the native name for the
Japanese water spider The Japanese water spider (''Argyroneta aquatica japonica'') is a subspecies of the water spider. In Japanese it is called the ''mizugumo''. The Japanese water spider is almost exactly like its European cousin. The only distinction between the tw ...
(''Argyroneta aquatica japonica''). The ''mizugumo'' was featured on the show ''
MythBusters ''MythBusters'' is a science entertainment television program, developed by Peter Rees and produced by Australia's Beyond Television Productions. The series premiered on the Discovery Channel on January 23, 2003. It was broadcast internatio ...
'', where it was demonstrated unfit for walking on water. The ''ukidari'', a similar footwear for walking on water, also existed in the form of a flat round bucket, but was probably quite unstable. Inflatable skins and breathing tubes allowed the ninja to stay underwater for longer periods of time. ''Goshiki-mai'' (go, ''five''; shiki, ''color''; mai, ''rice'') colored (red, blue, yellow, black, purple) rice grains used, in a code system, and to make trails that could be followed later. Despite the large array of tools available to the ninja, the ''Bansenshukai'' warns one not to be overburdened with equipment, stating "a successful ninja is one who uses but one tool for multiple tasks".


Weaponry

Although shorter swords and daggers were used, the '' katana'' was probably the ninja's weapon of choice, and was sometimes carried on the back. The ''katana'' had several uses beyond normal combat. In dark places, the scabbard could be extended out of the sword, and used as a long probing device. The sword could also be laid against the wall, where the ninja could use the sword guard ('' tsuba'') to gain a higher foothold. The ''katana'' could even be used as a device to stun enemies before attacking them, by putting a combination of red pepper, dirt or dust, and iron filings into the area near the top of the scabbard, so that as the sword was drawn the concoction would fly into the enemy's eyes, stunning him until a lethal blow could be made. While straight swords were used before the invention of the ''katana'', there's no known historical information about the straight ''
ninjatō The , , or , are the preferred weapon that the ''shinobi'' of feudal Japan carried, usually carried on the persons back, specifically horizontally at a height of around that of the person's waist. It is portrayed by modern ninjutsu practitioner ...
'' pre-20th century. The first photograph of a ''ninjatō'' appeared in a booklet by Heishichirō Okuse in 1956. A replica of a ''ninjatō'' is on display at the Ninja Museum of Igaryu. An array of darts, spikes, knives, and sharp, star-shaped discs were known collectively as '' shuriken''. While not exclusive to the ninja, they were an important part of the arsenal, where they could be thrown in any direction. Bows were used for sharpshooting, and some ninjas' bows were intentionally made smaller than the traditional '' yumi'' (longbow). The chain and sickle (''
kusarigama A is a traditional Japanese weapon that consists of a ''kama'' (the Japanese equivalent of a sickle or billhook) on a kusari-fundo – a type of metal chain (''kusari'') with a heavy iron weight (''fundo'') at the end. The ''kusarigama'' is said ...
'') was also used by the ninja. This weapon consisted of a weight on one end of a chain, and a sickle ('' kama'') on the other. The weight was swung to injure or disable an opponent, and the sickle used to kill at close range.
Explosive An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An expl ...
s introduced from China were known in Japan by the time of the Mongol Invasions in the 13th century. Later, explosives such as hand-held bombs and
grenade A grenade is an explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a shell (explosive projectile) shot from the muzzle of a rifle (as a rifle grenade) or a grenade launcher. A modern hand grenade genera ...
s were adopted by the ninja. Soft-cased bombs were designed to release smoke or poison gas, along with fragmentation explosives packed with iron or ceramic
shrapnel Shrapnel may refer to: Military * Shrapnel shell, explosive artillery munitions, generally for anti-personnel use * Shrapnel (fragment), a hard loose material Popular culture * ''Shrapnel'' (Radical Comics) * ''Shrapnel'', a game by Adam ...
. Along with common weapons, a large assortment of miscellaneous arms were associated with the ninja. Some examples include
poison Poison is a chemical substance that has a detrimental effect to life. The term is used in a wide range of scientific fields and industries, where it is often specifically defined. It may also be applied colloquially or figuratively, with a broa ...
, '' makibishi'' ( caltrops), ''
shikomizue Japanese sword mountings are the various housings and associated fittings ('' tosogu'') that hold the blade of a Japanese sword when it is being worn or stored. refers to the ornate mountings of a Japanese sword (e.g. ''katana'') used when the ...
'' ( cane swords), land mines, '' fukiya'' ( blowguns), poisoned darts,
acid In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequ ...
-spurting tubes, and
firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in different countries (see Legal definitions). The first firearms originated in 10th-century China, when bamboo tubes ...
s. The ''happō'', a small eggshell filled with ''
metsubushi or ''gantsubushi'' are a variety of implements and techniques that were used in feudal Japan by samurai police and other individuals to temporarily or permanently blind or disorient an opponent. Description One type of ''metsubushi'' was used ...
'' (blinding powder), was also used to facilitate escape.


Legendary abilities

Superhuman The term superhuman refers to humans or human-like beings with enhanced qualities and abilities that exceed those naturally found in humans. These qualities may be acquired through natural ability, self-actualization or technological aids. Th ...
or
supernatural Supernatural refers to phenomena or entities that are beyond the laws of nature. The term is derived from Medieval Latin , from Latin (above, beyond, or outside of) + (nature) Though the corollary term "nature", has had multiple meanings si ...
powers were often associated with the ninja with a style of Japanese
martial arts Martial arts are codified systems and traditions of combat practiced for a number of reasons such as self-defense; military and law enforcement applications; combat sport, competition; physical, mental, and spiritual development; entertainment; a ...
in ninjutsu. Some legends include flight, invisibility,
shapeshifting In mythology, folklore and speculative fiction, shape-shifting is the ability to physically transform oneself through an inherently superhuman ability, divine intervention, demonic manipulation, Magic (paranormal), sorcery, Incantation, ...
, teleportation, the ability to "split" into multiple bodies (''bunshin''), the summoning of animals (''kuchiyose''), and control over the five classical elements. These fabulous notions have stemmed from popular imagination regarding the ninja's mysterious status, as well as romantic ideas found in later Japanese art of the Edo period. Magical powers were rooted in the ninja's own misinformation efforts to disseminate fanciful information. For example, Nakagawa Shoshunjin, the 17th-century founder of Nakagawa-ryū, claimed in his own writings (''Okufuji Monogatari'') that he had the ability to transform into birds and animals. Perceived control over the elements may be grounded in real tactics, which were categorized by association with forces of nature. For example, the practice of starting fires to cover a ninja's trail falls under ''katon-no-jutsu'' ("fire techniques"). By dressing in identical clothing, a coordinated team of ninjas could instill the perception of a single assailant being in multiple locations. The ninja's adaption of kites in espionage and warfare is another subject of legends. Accounts exist of ninja being lifted into the air by kites, where they flew over hostile terrain and descended into, or dropped bombs on enemy territory. Kites were indeed used in Japanese warfare, but mostly for the purpose of sending messages and relaying signals. Turnbull suggests that kites lifting a man into midair might have been technically feasible, but states that the use of kites to form a human " hang glider" falls squarely in the realm of fantasy.


Kuji-kiri

'' Kuji-kiri'' is an esoteric practice which, when performed with an array of hand "seals" ('' kuji-in''), was meant to allow the ninja to enact superhuman feats. The ''kuji'' ("nine characters") is a concept originating from Taoism, where it was a string of nine words used in charms and incantations. In China, this tradition mixed with Buddhist beliefs, assigning each of the nine words to a Buddhist deity. The ''kuji'' may have arrived in Japan via Buddhism, where it flourished within Shugendō. Here too, each word in the ''kuji'' was associated with Buddhist deities, animals from Taoist mythology, and later, Shinto kami. The ''
mudrā A mudra (; sa, मुद्रा, , "seal", "mark", or "gesture"; ,) is a symbolic or ritual gesture or pose in Hinduism, Jainism and Buddhism. While some mudras involve the entire body, most are performed with the hands and fingers. As wel ...
'', a series of hand symbols representing different Buddhas, was applied to the ''kuji'' by Buddhists, possibly through the esoteric '' Mikkyō'' teachings. The '' yamabushi'' ascetics of Shugendō adopted this practice, using the hand gestures in spiritual, healing, and exorcism rituals. Later, the use of ''kuji'' passed onto certain '' bujutsu'' (martial arts) and '' ninjutsu'' schools, where it was said to have many purposes. The application of ''kuji'' to produce a desired effect was called "cutting" (''kiri'') the ''kuji''. Intended effects range from physical and mental concentration, to more incredible claims about rendering an opponent immobile, or even the casting of magical spells.; These legends were captured in popular culture, which interpreted the ''kuji-kiri'' as a precursor to magical acts.


Foreign ninja

On February 25, 2018, Yamada Yūji, the professor of
Mie University Mie University (三重大学; ''Mie Daigaku'', abbreviated to 三重大 ''Miedai'') is a national university in Tsu, Mie Prefecture, Japan. As with other national universities, Mie University has been a National University Corporation since Apr ...
and historian Nakanishi Gō announced that they had identified three people who were successful in early modern Ureshino, including the ninja Benkei Musō (弁慶夢想). Musō is thought to be the same person as
Denrinbō Raikei , also known as Benkei Musō was Chinese-born Japanese martial artist, ninja, swordsman, and Yamabushi. He belonged to Hitoyoshi Domain as ninja. He was thought to be the head of ninja group, Ura-Taisha(裏タイ捨) or Sagara-ningun(相良 ...
(伝林坊頼慶), the Chinese disciple of
Marume Nagayoshi Marume Nagayoshi (丸目 長恵, 1540–1629) was a retainer of the Sagara clan in the Sengoku period and a swordsman in the early Edo period. He was considered one of the best pupils of Kamiizumi Nobutsuna, and went on to found the Taisha ryū s ...
. It came as a shock when the existence of a foreign samurai was verified by authorities.


Famous people

Many famous people in Japanese history have been associated or identified as ninja, but their status as ninja are difficult to prove and may be the product of later imagination. Rumors surrounding famous warriors, such as Kusunoki Masashige or Minamoto no Yoshitsune sometimes describe them as ninja, but there is little evidence for these claims. Some well known examples include: * Kumawakamaru (13th–14th centuries): A youth whose exiled father was ordered to death by the monk Homma Saburō. Kumakawa took his revenge by sneaking into Homma's room while he was asleep, and assassinating him with his own sword. He was son of a high counselor to Emperor Go-Daigo, not ninja. The yamabushi Daizenboh who helped Kumawakamaru's revenge was Suppa, a kind of ninja. * Kumawaka (the 16th century): A suppa (ninja) who served
Obu Toramasa , known as the "Wild Tiger of Kai", was a Japanese samurai of the Sengoku period, who served the Takeda clan. He was known as one of the "Twenty-Four Generals of Takeda Shingen".Inoue, Yasushi. (2006) ''The Samurai banner of Furin Kazan,'' p. 7 Hi ...
(1504– 1565), a vassal of Takeda Shingen.熊若
忍者名鑑
* Yagyū Munetoshi (1529–1606): A renowned swordsman of the Shinkage-ryū school. Muneyoshi's grandson, Jubei Muneyoshi, told tales of his grandfather's status as a ninja. * Hattori Hanzō (1542–1596): A samurai serving under Tokugawa Ieyasu. His ancestry in Iga province, along with '' ninjutsu'' manuals published by his descendants have led some sources to define him as a ninja. This depiction is also common in popular culture. * Ishikawa Goemon (1558–1594): Goemon reputedly tried to drip poison from a thread into
Oda Nobunaga was a Japanese ''daimyō'' and one of the leading figures of the Sengoku period. He is regarded as the first "Great Unifier" of Japan. Nobunaga was head of the very powerful Oda clan, and launched a war against other ''daimyō'' to unify ...
's mouth through a hiding spot in the ceiling, but many fanciful tales exist about Goemon, and this story cannot be confirmed. *
Fūma Kotarō was the name adopted by the leader of the ninja during the Sengoku era of feudal Japan. He was retainer of Later Hōjō clan. According to some records, his name was originally Kazama Kotarō (風間 小太郎). The Fūma clan and Fūma Kota ...
(d. 1603): A ninja rumored to have killed Hattori Hanzō, with whom he was supposedly rivals. The fictional weapon '' Fūma shuriken'' is named after him. *
Mochizuki Chiyome Mochizuki Chiyome (望月 千代女), also known as Mochizuki Chiyojo (望月 千代女) or Mochizuki Chiyo (望月 千代), was a 16th-century Japan, Japanese poet and noblewoman. She is known for creating a group of kunoichi in service of the Ta ...
(16th century): The wife of Mochizuke Moritoki. Chiyome created a school for girls, which taught skills required of geisha, as well as espionage skills. * Momochi Sandayū (16th century): A leader of the Iga ninja clans, who supposedly perished during Oda Nobunaga's attack on Iga province. There is some belief that he escaped death and lived as a farmer in Kii Province. Momochi is also a branch of the Hattori clan. * Fujibayashi Nagato (16th century): Considered to be one of three "greatest" Iga ''jōnin'', the other two being Hattori Hanzō and Momochi Sandayū. Fujibayashi's descendants wrote and edited the ''Bansenshukai''. *
Katō Danzō was a famed 16th century ninja master during the Sengoku period Japan who was also known as . Biography There are many versions of his story and many mysteries surround him. According to the legend he practiced sorcery, performing amazing fe ...
(1503–1569): A famed 16th-century ninja master during the Sengoku period who was also known as "Flying Katō". *
Tateoka Doshun was an intermediate-ranking Iga ninja during the Sengoku period. He is also known as Igasaki DoshunJoel Levy , ''Ninja: The Shadow Warrior'' or . Stephen K. Hayes, ''The Mystic Arts of the Ninja'' In 1558, during the siege of Sawayama, Tateoka D ...
(16th century): An intermediate-ranking Iga ninja during the Sengoku period. *
Karasawa Genba was a samurai of the Sengoku period, in the 16th century of the common era, who served as an important retainer of the Sanada clan. Genba_was_allegedly_born_in_Sawatari,_Shinano_province.html" ;"title="DF 56 of 80/nowiki>">DF 56 of 80">("S .... G ...
(16th century): A samurai of the Sengoku period, in the 16th century of the common era, who served as an important retainer of the Sanada clan.


In popular culture

The image of the ninja entered popular culture in the Edo period, when folktales and plays about ninja were conceived. Stories about the ninja are usually based on historical figures. For instance, many similar tales exist about a ''daimyō'' challenging a ninja to prove his worth, usually by stealing his pillow or weapon while he slept. Novels were written about the ninja, such as ''
Jiraiya Gōketsu Monogatari Jiraiya (自来也 or 児雷也, literally "Young Thunder"), originally known as Ogata Shuma Hiroyuki (尾形周馬寛行), is the toad-riding protagonist of the Japanese folk tale Katakiuchi Kidan Jiraiya Monogatari (報仇奇談自来也説話, " ...
'', which was also made into a kabuki play. Fictional figures such as Sarutobi Sasuke would eventually make their way into comics and television, where they have come to enjoy a
culture hero A culture hero is a mythological hero specific to some group ( cultural, ethnic, religious, etc.) who changes the world through invention or discovery. Although many culture heroes help with the creation of the world, most culture heroes are imp ...
status outside their original mediums. Ninja appear in many forms of Japanese and Western popular media, including books ('' Kōga Ninpōchō''), movies (''
Enter the Ninja ''Enter the Ninja'' is a 1981 American martial arts film directed by Menahem Golan and starring Franco Nero, Susan George, Sho Kosugi and Christopher George. The film is about a martial artist named Cole (Nero) who is visiting his friend Frank ...
'', ''
Revenge of the Ninja ''Revenge of the Ninja'' is a 1983 American martial arts– thriller film directed by Sam Firstenberg, and starring martial artist Sho Kosugi, Keith Vitali, Virgil Frye and Kane Kosugi. The plot follows a ninja trying to protect his only son fr ...
'', '' Ninja Assassin''), television (''
Akakage is a Japanese superhero ninja featured in several manga and anime, as well as live-action movies and TV shows. Akakage first appeared in the 1967 TV series, ''Kamen no Ninja Akakage'' which was produced by Toei Company Ltd. Characte ...
'', '' The Master'', ''
Ninja Warrior ''Sasuke'' (サスケ; stylized in Japan as ''SASUKE'', also known as ''Shin-Sasuke'' (stylized as ''新SASUKE'' from Seasons 18 to 21, ''Sasuke Rising'' from Seasons 28 to 30 and ''Sasuke Ninja Warrior'' since Season 35) is a Japanese sports ...
''), List of ninja video games, video games (''Shinobi (series), Shinobi'', ''Ninja Gaiden'', ''Tenchu'', ''Sekiro'', ''Ghost of Tsushima''), anime (''Naruto'', ''Ninja Scroll'', ''Gatchaman''), manga (''Basilisk (manga), Basilisk'', ''Ninja Hattori-kun'', ''Azumi''), Western animation (''Ninjago (TV series), Ninjago: Masters of Spinjitzu'') and American comic books (''Teenage Mutant Ninja Turtles''). From ancient Japan to the modern world media, popular depictions range from the realistic to the fantastically exaggerated, both fundamentally and aesthetically.


Gallery

File:Tekko-Kagi Ninja1.jpg, ''Tekko-kagi'', hand claws File:Ashiko cleats.JPG, ''Ashiko'', iron climbing cleats File:Ashiko cleats 1.JPG, ''Ashiko'', iron climbing cleats File:Kaginawa.JPG, ''Kaginawa'', iron climbing hook File:shikomizue.JPG, ''Japanese sword mountings#Shikomizue, Shikomizue'', a cane sword File:Makibishi.JPG, ''Makibishi'', iron caltrops File:Shuriken.JPG, Shuriken, ''Bo-shuriken'', throwing darts File:4 bo shuriken.JPG, Shuriken, ''Bo-shuriken'', with linen flights File:2 chigiriki.JPG, ''Chigiriki'', chain and weight weapons File:Small kusarigama.JPG, ''Kusarigama'', a chain and sickle File:Manriki.JPG, ''Kusari-fundo'', a chain weapon File:Ninja type weapons.JPG, Various concealable weapons File:kusari katabira4.JPG, Chain mail shirt (Commons:Kusari (Japanese mail armour), ''Kusari katabira'')


See also

* Kunoichi * Order of Assassins * Order of Musashi Shinobi Samurai * Sicarii * Ninja Museum of Igaryu


References


Citations


Sources

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *


Further reading

* Fujibayashi, Masatake; Nakajima, Atsumi. (1996). ''Shōninki: Ninjutsu densho''. Tokyo: Shinjinbutsu Ōraisha. . * Fujita, Seiko. (2004). ''Saigo no Ninja Dorondoron''. Tokyo: Shinpūsha. . * Fukai, Masaumi. (1992). ''Edojō oniwaban : Tokugawa Shōgun no mimi to me''. Tokyo: Chūō Kōronsha. . * Hokinoichi, Hanawa. (1923–1933). ''Buke Myōmokushō''. Tokyo: Yoshikawa Kōbunkan. . * Ishikawa, Masatomo. (1982). ''Shinobi no sato no kiroku''. Tokyo: Suiyōsha. . * * * Nawa, Yumio. (1972). ''Hisshō no heihō ninjutsu no kenkyū: gendai o ikinuku michi''. Tokyo: Nichibō Shuppansha. . * Nawa. Yumio. (1967). ''Shinobi no buki''. Tokyo: Jinbutsu Ōraisha. . * Okuse, Heishichirō. (1967). ''Ninjutsu: sono rekishi to ninja''. Tokyo: Jinbutsu Ōraisha. . * Okuse, Heishichirō. (1964). ''Ninpō: sono hiden to jitsurei''. Tokyo: Jinbutsu Ōraisha. . * * Watatani, Kiyoshi. (1972). ''Bugei ryūha hyakusen''. Tokyo: Akita Shoten. . * Yamaguchi, Masayuki. (1968). ''Ninja no seikatsu''. Tokyo: Yūzankaku. .


External links

* {{Authority control Ninja, Combat occupations Japanese warriors Japanese words and phrases Mercenary units and formations Obsolete occupations