When asked to name one thing a warrior would carry with them onto the battlefield during Japan’s warring periods, what would you say? I’m sure popular responses would be bow & arrow, spear, sword, and possibly rifle, depending on the time period. But what about the gunbai? Although it’s not viewed as a weapon to kill an opposing soldier, a gunbai holds a very high level of respect in Japan’s military history. In fact, it can be said that it embodies the idea of obtaining victory on a non-physical level.
In this post, we will discuss about what a gunbai is and its design. Along with this, we’ll explore what it represents physically, as well as the conceptual practices in regards to the success in military campaigns.
WHAT IS A GUNBAI?
A gunbai (軍配)¹ is categorized as a type of fan, with an alternative name being “uchiwa” (団扇). The full name for this is “gunbai-uchiwa” (軍配団扇) , or “war fan” in English. It is recorded that this tool came from China, and seen its start as an essential item for military purposes around the Muromachi period. A gunbai was symbolic as a sign of authority by those who wield it, which is generally the commander, a leader, or someone equivelant in term of strategy know-how. With a gunbai in hand, the one in charge directs the army’s movements and actions. However, it was more than just a tool for signaling, as there was a concept that went beyond this physical tool, where one learns to predict the conditions going into war, as well as the potnential outcome. Despite its physical appearance, the physical gunbai had a special place in the study of military strategy more than just “fanning” to keep a person cool.


Nowadays, antiquated war fans can be seen in museums, in the property of those who may have acquired it as an heirloom, or even purchasable at auctions . On another note, gunbai are widely seen in modern day sumo competitions, with the gyōji (行司, referee) using it in dictating the progression of a match, as well as to ward away evil spirits to ensure safe competition.
DESIGNS AND PRESENTATION
The structure and design of a gunbai follows a specific format. A common look is a rod around 2 ft long, with two broad planks attached on either side on the top half of the rod, and a long tassle(s) on the opposite end. The planks come in different shapes, usually roundish. A gunbai is made out of either metal and/or wood, and is painted or lacquered.

It is not unccommon for a gunbai to have different kanji (漢字, Chinese characters) or even esoteric writings such as bonji (梵字, Sankrit) written on them; the combination of these characters may carry significant, power-attuning meanings. There were those that may even possess diagrams that follow auspicious practices or systems. More on this later.
USAGE AND PRACTICES
On a fundamental level, a gunbai is used for commanding one’s army, such as making orders, dictating formations, etc. If you look at woodblock paintings, or even better, watch any programs that has a setting dated back to Japan’s warring periods, you’ll most likely see it in the hands of a commanding officer, while out on the battlefield or in a camp. It’s similar in use to another tool called the saihai (采配), which consisted of a baton with a bushy long hairs like a horsetail on one end, and a long tassel on the opposite end.
On a deeper, surreal level, it is connected to specific beliefs, including energy attuning, reading the weather, fortune predictions, discerning luck based on a particular days and directions, and understanding positions of the stars. While such practices are usually associated with particular priests or shamans, those specializing in military activities are also documented to have taken this serious as well. Also, Chinese-influenced concepts such Inyō Gogyō no setsu (陰陽五行説) and Hakke (八卦) were part of this unique study with the gunbai, for it was not unusual to have illustrations of the diagrams of said concepts drawn on one side of this war fan.
Such a vast level of metaphysical and spiritual practice was viewed as essential for the sake of victory. This wasn’t seen as strange, since the nation of Japan in the past was very superstitious on many topics.
DIFFERENT STYLES
As mentioned earlier, the concept of the “gunbai” goes beyond a mere tool, as it represented the study of dictating the outcome of a battle in one’s favor. This encompassed strategies from old Chinese military text, applicable control of battlefield movements, and auspicious practices to assist in one’s decision making. As a whole, this is coined “gunbai no jutsu” (軍配術), or “gunbai hyōhō” (軍配兵法). Those who study this are nicknamed “gunbaisha” (軍配者).

Below are a few examples of schools on utilizing gunbai in its strategy form:
- Takeda gungaku (武田軍学)
- Sankoku ryū gunbai (三極流軍配)
- Iga Fuzan ryū hyōhō (伊賀風山兵法)
Many of these different schools tend to reference the source of this study being Minamoto no Yoshitsune’s legendary Tora no maki (虎の卷). Along with this, scholars use Takeda gungaku as a valuable research point, as comprehensive documentation regarding practices of gunbai as military study is made available publicly, such as Kōyō Gunkan (甲陽軍鑑). Much of Takeda gungaku’s acclamations is contributed to Yamamoto Kansuke’s knowledge, who is said to have been a brilliant strategist and warrior.

Typically not seen as an instrument for physical combat, there is one interesting case. There is an iconic story that took place in 1561, where 2 rivaling warlords by the name of Takeda Shingen and Uesugi Kenshin were prepared to clash against one another in an ongoing battlefield campaign at Kawanakajima (present-day Nagano City, Nagano Prefecture). It is said that Shingen was at his camp, as his army were preparing to head out to the battlefield, when Kenshin rushed into the camp on horseback. Charging straight at his long time rival, Uesugi brandished his long sword and swung for the vulnerable Shingen, who in response cooly held up his metal gunbai and effortlessly blocked the attack. This exchange continued, for as Kenshin lashed with more sword strokes, Shingen held his ground and deflected them all with his gunbai. Things finally at a standstill, with Kenshin quickly departing from the camp just as he had entered. This story has been immortalized as an example of valor and martial expertise…but is this tale actually fictional? It is hard to verify, but what can be taken from this is the claimed sturdyness of a metal gunbai.
ENDING
We come to the close on this discussion on the gunbai. Researching the ins and outs of this, especially the fortune-telling concepts attached to its use in military-related purposes, is a dedicated study on its own. While a gunbai’s popular, physical form as a fan is what is usually presented, it’s important to remember that there is also the strategic concept that can stand alone as well.
1) Also said to use the kanji “軍敗”, although personally I’ve not come across this variation before.