The Battle of Okehazama, fought in June 1560, is one of those rare moments where history seems to turn on a single afternoon. A young and often underestimated Oda Nobunaga faced the powerful Imagawa Yoshimoto, a daimyo who appeared ready to march towards Kyoto and dominate central Japan.
On paper, it should barely have been a contest. The Imagawa army was vastly larger, better established and commanded by a respected leader. Nobunaga controlled only part of Owari Province and had a reputation among some rivals as an eccentric troublemaker rather than a future unifier.
Then Okehazama happened.
Through intelligence gathering, speed, deception and a dangerous attack on Yoshimoto’s exposed command position, Nobunaga destroyed a superior enemy force. It was a victory that announced him as one of the most formidable figures of the Sengoku period.
Sometimes history rewards careful planning. Sometimes it rewards someone willing to look at terrible odds and think, “Actually, I might try this anyway.”
Historical Background
During the Sengoku period, Japan was divided between rival military families competing for territory and influence.
By 1560, Imagawa Yoshimoto was among the strongest daimyo in eastern Japan. His alliance network included the Matsudaira clan of Mikawa, whose young leader Matsudaira Motoyasu would later become Tokugawa Ieyasu.
Yoshimoto moved west with the intention of expanding his influence into Owari. Traditional accounts claim he was marching towards Kyoto, although modern historians debate whether immediate control of the capital was his true objective.
Standing in his way was Oda Nobunaga.
Nobunaga had recently secured control over much of Owari after years of family disputes. His position remained fragile, and many expected him to avoid open confrontation.
He chose the opposite.
Forces At The Battle Of Okehazama
Numbers from Sengoku battles are often difficult to verify, and later chronicles sometimes exaggerated figures to make victories appear even more dramatic. The general picture, however, is clear. Nobunaga was heavily outnumbered.
| Army | Commander | Estimated Strength | Objective |
|---|---|---|---|
| Oda Clan | Oda Nobunaga | Around 2,000 to 3,000 troops | Defend Owari and stop the Imagawa advance |
| Imagawa Clan | Imagawa Yoshimoto | Around 20,000 to 25,000 troops traditionally recorded, possibly fewer | Expand west and defeat the Oda |
Leaders And Troop Composition
Oda Clan
Commander: Oda Nobunaga
Forces likely included:
- Samurai retainers
- Ashigaru infantry
- Spearmen
- Archers
- Early firearm units using matchlock arquebuses
- Scouts and messengers
Important Oda commanders:
| Leader | Role |
| Oda Nobunaga | Overall commander |
| Mori Yoshinari | Senior retainer and battlefield commander |
| Shibata Katsuie | Experienced Oda warrior |
| Maeda Toshiie | Young retainer who later became a major daimyo |
Nobunaga’s strength was not numbers. His advantage came from rapid decision making and the ability to move before his opponent understood what was happening.
Imagawa Clan
Commander: Imagawa Yoshimoto
Forces included:
- Elite samurai cavalry
- Ashigaru spear formations
- Archers
- Matchlock troops
- Allied clan contingents
- Supply and support troops
Important Imagawa figures:
| Leader | Role |
| Imagawa Yoshimoto | Daimyo and commander |
| Matsudaira Motoyasu (Tokugawa Ieyasu) | Imagawa ally commanding Mikawa forces |
| Ii Naomori | Imagawa retainer |
| Asahina clan commanders | Senior military supporters |
The Imagawa army was powerful, but its size created problems. It was spread across several locations, allowing Nobunaga to strike one vulnerable point.
Arms And Armour At Okehazama
The battle took place during a period of major military change. Traditional samurai warfare existed alongside mass infantry tactics and increasing firearm use.
Samurai Weapons
Katana
The katana was the iconic sidearm of the samurai.
Features:
- Curved single-edged blade
- Usually around 60 to 80 cm blade length
- Designed for powerful cutting strikes
- Worn edge-up through the belt
By the Sengoku period, the katana was often a secondary battlefield weapon rather than the main arm.
Tachi
Older style swords were still used, especially by mounted warriors.
Features:
- Longer curved blade
- Suspended edge-down from armour
- Associated with cavalry combat
Wakizashi
A shorter companion sword used alongside the katana.
Uses:
- Close fighting
- Indoor defence
- Backup weapon if the main weapon was lost
Yari
The spear dominated Sengoku warfare.
Advantages:
- Longer reach than swords
- Easier to train mass infantry
- Effective against cavalry and infantry formations
Many ashigaru carried long yari rather than swords.
Naginata
The naginata remained in use, although its battlefield importance declined as spear formations became dominant.
Yumi
Japanese longbows remained important.
Features:
- Asymmetric design
- Effective from horseback or on foot
- Used before close combat began
Tanegashima Matchlock Arquebus
Introduced to Japan in 1543, firearms were becoming increasingly important.
At Okehazama they were present, although not yet used on the enormous scale Nobunaga later demonstrated at Nagashino in 1575.
Armour Used
Tosei Gusoku
The “modern armour” of the Sengoku battlefield.
Typical features:
- Iron plate construction
- Designed for mass warfare
- Better protection against arrows and firearms
- Practical compared with earlier elaborate armour
Kabuto Helmets
Samurai helmets varied greatly.
They could include:
- Iron bowls
- Neck guards
- Decorative crests
- Clan symbols
Some designs were surprisingly dramatic. Sengoku commanders clearly understood intimidation long before modern branding departments discovered it.
The Battle Timeline
Early June 1560: Imagawa Enters Owari
Yoshimoto advanced into Oda territory with a large army.
Several border forts fell, increasing pressure on Nobunaga.
Nobunaga Prepares His Response
Many advisers reportedly recommended a defensive position or surrender.
Instead, Nobunaga gathered his available forces and moved quickly.
According to later accounts, he performed the famous Atsumori dance before leaving, reflecting on the short nature of human life.
Imagawa Camp At Okehazama
Yoshimoto’s main force rested after victories against Oda positions.
The Imagawa leadership believed Nobunaga was unable to launch a serious attack.
This confidence proved expensive.
The Storm And Surprise Attack
A sudden storm concealed the Oda movement.
Nobunaga’s troops advanced rapidly towards Yoshimoto’s camp and attacked before the Imagawa could properly organise.
The exact details remain debated, but the result was devastating.
Death Of Imagawa Yoshimoto
Yoshimoto was killed during the fighting.
Traditional accounts name Mori Shinsuke and Hattori Koheita among those involved in his final moments.
With their commander dead, Imagawa organisation collapsed.
Archaeology And Battlefield Evidence
The exact battlefield landscape has changed significantly due to urban development, but Okehazama remains an important historical site.
Important locations include:
- Okehazama Battlefield Park in modern Nagoya
- Sites traditionally linked to Yoshimoto’s final camp
- Memorial stones connected with fallen warriors
Archaeological work has focused on:
- Mapping likely troop movements
- Studying surviving Sengoku-period weapons
- Understanding the geography of the battlefield
Unlike some ancient battlefields, Okehazama does not have a large collection of confirmed battlefield finds. Much evidence comes from documents, later chronicles, family records and comparison with surviving Sengoku military equipment.
Contemporary Quotes And Historical Sources
Direct battlefield quotes from 1560 are difficult to prove, but later Japanese chronicles preserve several famous traditions.
Before departing, Nobunaga is associated with a verse from Atsumori:
“Man has but fifty years under heaven.”
This reflected Buddhist ideas about the temporary nature of life and became closely associated with Nobunaga’s image.
The Shinchō Kōki, a biography of Nobunaga written by his retainer Ōta Gyūichi, remains one of the most important sources for his campaigns.
It portrays Nobunaga as a commander who acted decisively while others hesitated.
Why Did Nobunaga Win?
Several factors shaped the result:
- Accurate intelligence about Yoshimoto’s position
- Rapid movement
- The Imagawa army being spread out
- Overconfidence among Imagawa commanders
- Effective use of terrain and weather
- Nobunaga’s willingness to risk everything
Okehazama was not simply luck. The storm helped, but Nobunaga created the conditions where luck could actually matter.
Aftermath And Legacy
The consequences were enormous.
The Imagawa clan never fully recovered from Yoshimoto’s death. Their weakening allowed Matsudaira Motoyasu to break away and eventually rise as Tokugawa Ieyasu, founder of the Tokugawa shogunate.
For Nobunaga, Okehazama transformed his reputation. The strange young lord of Owari became a serious contender in the struggle for Japan.
His later campaigns would reshape warfare through aggressive tactics, economic reform, castle development and greater use of firearms.
Okehazama remains fascinating because it was not the biggest battle of the Sengoku era, but few battles changed so much with such a small force.
A few thousand determined warriors walked into a storm. Japan came out of it heading in a completely different direction.
