Strategies used by warlords for total supremacy during the warring states are often described in detailed recollections within the pages of Japanese historical documents, along with modern novels. It is not limited to those on the winning side, for war journals, manuals, and the like by families, commanders, and even warriors who made significant contributions on the battlefield, are held in high regard. For me, some of the more interesting sections I find are those that lay out info regarding the strategic make up of an army, which includes the gear, techniques, and methodology. Jinkei (陣形), or battle formations in English, is one that falls into this category, yet has a lot of shrouded mystery around it due to a lack of explanation even when illustrations are provided.
Battle formations used in Japanese wars is a topic I’ve wanted to write about for a long while. Bearing many variables such as truths and overall effectiveness, this is one that I’ve spent a long time analyzing, and am willing to cover in a series format. Amongst many conversations I’ve come across on said topic, is a set of 8 battle formations which were first discovered in one of Japan’s highly prided historical documentation, and have been popularly laid out in the heroic recollections of powerful warlords utilizing them to outwit and claim victory over their adversaries. How true is this? Today’s article will serve as part 1 of this series, and will be our first step in getting to the bottom of understanding what battle formations are truly all about.
ORIGINS OF JAPAN’S TOP 8
These 8 formations are nicknamed “Sengoku Hachijin” (戦国八陣), which can be translated as “the 8 Battle Formations of Japan’s Warring States”. There are more battle formations in existence, from earlier times to methods used for varying situations. However, these 8 that will be covered today are considered very essential during the peak of Japanese systematic warfare¹, helping to further develop tactics in future times. As the name implies, these 8 formations were historically recorded to have been created, and used in skirmishes by famous warlords, during the 1500s, which makes them recognized as valuable material of study by researchers.

Here are the names for each of 8 battle formations, accompanied with my English translations.
- Gyorin no jin (魚鱗の陣, Fish Scale formation)
- Kakuyoku no jin (鶴翼の陣, Crane’s Wings formation)
- Engetsu no jin (偃月の陣, Crescent Moon formation)
- Kōyaku no jin (衝軛の陣, Oxen’s Yoke formation)
- Chōda no jin (長蛇の陣, Long Snake formation)
- Hōshi no jin (鋒矢の陣, Arrowhead formation)
- Hōen no jin (方円の陣, Squares and Circles formation)
- Gankō no jin (雁行の陣, Geese’s Flight formation)
While the names may sound like systematic positioning and intricate patterns were deployed, in truth these formations were much simpler in application due to the more straight-forward, head-on clashes Japanese armies participated in. Since as early as Heian period, commanders relied on troops to rush forward, meet their weapons against the enemy and beat them back, while cavalry stayed mobile on the field to disrupt the enemy lines. Thus, having a group of warriors assuming a stationary position waiting for the opposition to fall for some elaborate plan on the battlefield wasn’t as common as one would imagine.
Around the 1500s, battles gained new layers of strategy. Better equipment were being used, while new weapons were slowly being incorporated. Warlords at the time were crafting cunning, and oftentimes underhanded, methods to outwit and overcome the opposition. Forming smaller squads and units, and having them deployed during battle to accomplish specific goals became more common during this time. This is where Takeda Shingen (1521 ~ 1573), a highly decorated warlord of Kai Province (present day Yamanashi Prefecture), cemented himself as a major player through incorporating those 8 formations within his army, having certain units use them to counter, confuse, and eventually outmatch his enemies. This was possible due to the cleverness of Yamamoto Kansuke (???? ~ 1561), a renown tactician and one of the Takeda family’s top 28 officers.
Resources used in my research on the 8 formations include (but not limited) the following:
- Touken World (website)
- Sengoku no Jinkei (戦国の陣形), written by Naishi Masahiko (乃至政彦) (book)
- Eki to Kankō to Kotoba no Jōhō (website)
- Kōyō Gunkan ~ Kōyō Sōsho (甲陽軍艦 ~ 甲陽叢書) (online library)
UNDERSTANDING THE FORMATIONS
Now, let’s look at each of the 8 formations. Below are illustrations of how each are utilized by an army, which include key players & units used during Sengoku period. Each individual and/or group will be color-coded under the following:
- RED = commander / team commander / leader
- ORANGE = front line
- YELLOW = 2nd unit / 3rd unit / mobile cavalry
- PURPLE = commander’s personal guards
- BLACK = back line / archers / gunners / etc.
Some things to point out before going forward. Formations found in military manuals, scrolls, or other documentations serve as a visual guide to build upon. They are neither to be taken as-is, or followed 100% strictly; due to the nature of conflict, environment, soldiers at hand, size & placement of the enemy, the progression of the battle at hand, etc. a commander or tactician may take liberty and change how the overall formation should be finalized both in shape and positions. Saying this, the illustrations provided are merely to serve as examples to give the reader a visual understanding of a possible use of each of the 8 formations. All illustrations feature the army facing towards the right.
#1
Gyorin no jin (Fish Scale formation)


A formation where the commander is placed in the middle of his army closer to the back, while the majority of the force is in the front. At first glance, the defensive capabilities of Gyorin no jin is pretty clear, which is why the name “fish scale” is used. However, in reality it possesses relatively good offensive traits as well. For example, we can use the imagery of a spear, where the front line is narrowed like point and charges through , while the rest of the troops behind gradually widening out all the way to the back line. The commander sits safely near the center, well surrounded by the army.
Other than offering all-around protection, Gyorin no jin can be used to pierce through the center of the opposing army, disrupting their formation, and ultimately wiping them out as they are left divided.
#2
Kakuyoku no jin (Crane’s Wings formation)


A formation compared to the splendor of a crane’s wings spread wide, where your army fights grouped together, then separates outwards. The wings create a “V” shape when extended outward, which dictates the strategic movements. In the diagram, the commander is at the back-center, and the frontline troops are at the front. As they approach the enemy army, the supplementary units (the 2nd and 3rd units) spread outward, creating a 3-way attack where the opposition has to not only deal with the frontal assault, but being swarmed from the sides at the same time
Outside of its ability to surround the opponent by enveloping them, Kakuyoku no jin is considered to have good defensive properties.
#3
Engetsu no jin (Crescent Moon formation)


Engetsu no jin is a formation liken to a half moon. There are 2 variations, with the 1st having the commanding officer take the lead in the center, while the troops curve outward and trail behind, while the 2nd has the commanding officer instead in the back in the center while the troops are ahead in a curving fashion. In either variation, the commanding officer is considered being active closer to the front line leading the charge to attack the opposing army head on, making them visibly present.
A rather risky tactic, Engetsu no jin demonstrates a moment when the army’s on the losing end and morale is low. In order to invigorate and, possibly, turn the tables in a dire situation, the commander charges forward before his army, using his act of bravery to rally his troops to stay firm and continue the fight.
#4
Kōyaku no jin (Oxen’s Yoke formation)


Visually this a wide formation, where troops form 2 semi-lines through the forefront troops and the back line, with each stretching to either side of the commander. Kōyaku no jin creates a shape which can resemble 2 oxen linked together with a yoke, allowing the army to create an impenetrable defense through this formation, or pincer the enemy by wrapping around them.
With the ability to react to a situation whether a threat is in the front or comes from behind, Kōyaku no jin is recognized for its high defensive traits.
#5
Chōda no jin (Long Snake formation)


In this formation, the commander has their troops grouped together in a long line, resembling a snake. Strategically, this line creates 3 parts: a head, a tail, and the body. The idea is everyone moves according to the line, which is more prominent on narrow paths. All parts focus their attacks forward lead by the head, while simultaneously protecting any part that is in danger from an enemy’s assault. (i.e. the tail end protects the head, the head protects the tail, the head & tail protects the body).
Chōda no jin is a simple line formation that can be easily utilized in narrow environments, without fear of being surrounded.
#6
Hōshi no jin (Arrowhead formation)


The foundation of Hōshi no jin is that of the shape of an arrow. With one look, we can discern the main parts, and the intentions behind its movements. For example, the commander is at the back (nock) directing the troops (arrowhead) in the designated direction. As the front line penetrates through the enemy lines, the 2nd units behind push opposition troops to the side, making a large path for the rest of the army to follow.
By design, the leader stands behind the troops, directing them like an arrow. Hōshi no jin prioritizes quick & rapid assaults, such as when targeting the enemy commander.
#7
Hōen (Squares and Circles formation)


The name “Hōen” implies that smaller squads form a defensive perimeter around the commander and the main army. 2 patterns are created by the smaller squads, one being a 4-way and the other an 8-way. While one can see the potential through the shapes of the formation, the following proverb may also give a clue behind this formation:
| 方円之器(ほうえんのき) 「水は方円の器に従う(人は環境や指導者によって良くも悪くもなる)」 | “Square and round vessels” “Water takes the shape of its container (and people become good or bad depending on their friends).” |
Establishing a near 360 defensive wall, Hōen no jin is a formation strong against an enemy army that attempts to surround and conquer, use sudden attacks, as well as invade through night raids.
#8
Gankō (Geese’s Flight formation)


This is a formation that has characteristics of the diagonal flight pattern by a flock of wild geese. The strategy here is the front most troops diverge at an angle while the rest of the army continues forward to confront the opposition. This sudden change of course by the smaller team of troops can open up opportunities for tricky strategies such as flanking attacks, or handling danger coming from a different direction.
Gankō no jin is a flexible formation, as it is advantageous when paired with other formations, as well as can provide additional defensive capabilities.
SHINGEN AND KANSUKE’S INSPIRATIONS
While the overall application and methodology in Japanese warfare makes them products of Japanese ingenuity, the concepts behind the 8 formations are not 100% so. Before their conception, different Chinese military sources reached the shores of Japan through cultural exchanges, and introduced the basis of battle formations.
Those who were privy to the contents of these foreign sources and could decipher their teachings incorporated them into their battle strategies. However, their full potential wouldn’t be unlocked until centuries later, when warlords fought feverishly to be the ruler of Japan and unite all the lands within this island country.
In present times, the discovery of these 8 formations, and the methodology behind them fall on one source, the military treatise called Kōyō Gunkan (甲陽軍艦). Credit is given to Takeda Shingen and Yamamoto Kansuke, the masterminds behind said topic. Within the 27th volume of the Kōyō Gunkan is a recollection of a conversation between the 2 individuals regarding the 8 formations, where Kansuke explains their roots from different Chinese military works². These sources provided the strategic foundation, framework for the individual organization, and the coded naming convention used for each of the 8 formations. Kansuke also went as far as staking a claim about his ability to decipher these foreign tactics in a way that no other warlords can³. Praise is given to him due to his insight in foreign tactics and his resourcefulness in making them accessible in unforeseen ways, as well as to his lord Shingen who, through his natural leadership skills, possessed the ability to command his army using the 8 formations to claim many victories.
What makes the 8 formations as described in the Kōyō Gunkan highly regarded is the unique manner in which the Takeda army utilized them, for the direction Kansuke and Shingen went with goes beyond an army assuming a mere strategic shape as a whole. This is discovered through reading the summary of different battles in the Kōyō Gunkan, although the formations used are not written in clear & descriptive manner. Japanese researchers spent time to break down the contents in each of these summaries to identify when, where, and how each formation came into play.
As a whole, the 8 formations as learned from exploits recorded in the Kōyō Gunkan differ from the Chinese sources in many ways. We can even go as far and compare them to versions of battle formations utilized by other warlords in Japan. Such arguments already exist, as enthusiasts spent time analyzing the overall effectiveness of battle formations used in Japanese warfare. The sole fact that the Kōyō Gunkan not only lists all 8 of these formations, but describes their uses in actual battles, makes it easier for researchers to depend on it as a resource in their studies, which is the reason why Kansuke and Shingen are credited to properly introducing the methodology behind the 8 formations⁴. To fully understand how Kansuke pulled this off, as well as how Shingen contributed to revolutionize battlefield combat would require a separate, dedicated article, which will be in the works later this year.
CONCLUSION
We come to the end of this introduction of the famous 8 formations from Sengoku period. In the next part, there will be further analysis of each one, followed by examples from war stories of Japan’s past.
1) To be more specific, this is before Japan became unified under one single ruler, and incorporated modern methodology through Western influences.
2) Records like Taiheiki (太平記) mention only a few names from the 8 formations existed in events before Sengoku period, primarily Gyorin no jin and Kakuyoku no jin. While there’s a possibility that few warlords learned about them (or, something similar) a few centuries before Kansuke did, opinions lean towards the use of exaggeration narration in records that were compiled later in Edo period, which then included a few of the 8 formations after contents of the Kōyō Gunkan became public knowledge.
3) The actual statement about the 8 formations, which was spoken by Yamamoto Kansuke, is the following (source: Kōyō Gunkan ~ Kōyō Sōsho, pgs 175~176):
“…諸葛孔明八陣の図を御屋形様御手前にて諸人の合点仕る様に和げなされ御尤にて候からの軍法一魚鱗二に鶴翼三に長蛇四に偃月五に鋒矢六に方勾七に衡軛八に井干行是よきと申ても日本にては皆合点仕らず候其儀晴信公御分別次第になされ諸人の是を能存る様になさるへき…”
4) Interestingly, a few of these 8 formations have actually made it to modern times, where versions of them are used in sports & competitions.


































































