Signal arrow
Encyclopedia
Signal arrows, in Japanese, were arrows
Ya (arrow)
is the Japanese word for arrow, and commonly refers to the arrows used in .Ya also refers to the arrows used by samurai during the feudal era of Japan. Unlike Western arrows, the ya is close to a metre long or longer...

 which whistled when fired and were used in ritual archery exchanges prior to formal medieval battles. The sound was created by a specially carved or perforated bulb of deer horn or wood attached to the tip. In English, these are often called "whistling-bulb arrows", "messenger arrows", or "signal arrows." Kabura literally translates to "turnip
Turnip
The turnip or white turnip is a root vegetable commonly grown in temperate climates worldwide for its white, bulbous taproot. Small, tender varieties are grown for human consumption, while larger varieties are grown as feed for livestock...

", and thus the Japanese term technically means "turnip-shaped arrows." The Chinese xiangjian (sometimes pronounced and written mingdi) was quite similar, and up until the end of the Warlord Era
Warlord era
The Chinese Warlord Era was the period in the history of the Republic of China, from 1916 to 1928, when the country was divided among military cliques, a division that continued until the fall of the Nationalist government in the mainland China regions of Sichuan, Shanxi, Qinghai, Ningxia,...

 were commonly used by bandits to announce the gang's approach.

In battle, particularly around the time of the Heian period
Heian period
The is the last division of classical Japanese history, running from 794 to 1185. The period is named after the capital city of Heian-kyō, or modern Kyōto. It is the period in Japanese history when Buddhism, Taoism and other Chinese influences were at their height...

, kabura-ya would be fired before a battle, to alert the enemy. The whistling sound was also believed to chase away evil spirits, and to alert friendly kami
Kami
is the Japanese word for the spirits, natural forces, or essence in the Shinto faith. Although the word is sometimes translated as "god" or "deity", some Shinto scholars argue that such a translation can cause a misunderstanding of the term...

to lend their support. It was not uncommon for archery exchanges to be performed for quite some time, and in the 1183 battle of Kurikara
Battle of Kurikara
The battle of Kurikara, also known as the battle of Tonamiyama , was a crucial battle of Japan's Genpei War; in this battle the tide of the war turned in the favor of the Minamoto clan.-Background:...

, for example, fifteen arrows were fired by each side, then thirty, then fifty, then one hundred, before these hundred samurai on each side actually engaged one another in battle. It was also not uncommon for messages to be tied to these arrows, which could be fired into fortresses, battle camps or the like. This practice of the formal archery exchange likely died out gradually following the end of the Heian period, as war became less and less ritualized.

The arrows would also be sold at Shintō shrines as good luck charms, particularly around New Year's Day
New Year's Day
New Year's Day is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar used in ancient Rome...

; simply carrying a kabura-ya is meant to serve as a ward against evil spirits.
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