The Battle of Nagashino (1575) was one of the most decisive military
engagements of Japan’s Sengoku period.
Fought between Oda Nobunaga, Tokugawa Ieyasu, and the Takeda clan,
this battle marked a turning point in Japanese warfare — and had
significant implications for how shinobi operated on the battlefield.
Background: The Siege of Nagashino Castle
In 1575, Takeda Katsuyori led a massive army to besiege Nagashino
Castle in Mikawa Province.
The castle was held by Okudaira Sadamasa, a Tokugawa ally, and was
vastly outnumbered.
Key shinobi role:
During the siege, a brave messenger named Torii Suneemon slipped
through enemy lines to request reinforcements from Tokugawa Ieyasu.
This act of infiltration — moving undetected through enemy territory
— reflected the core skills of shinobi intelligence operations.
The Role of Shinobi at Nagashino
While open battle defined Nagashino, shinobi operated in the shadows:
- Scouting enemy positions and troop movements
- Delivering secret communications between commanders
- Gathering intelligence on Takeda cavalry formations
- Supporting psychological operations before the battle
Oda Nobunaga’s forces relied heavily on intelligence to prepare their
famous volley fire formations against the Takeda cavalry.
Nobunaga’s Victory and the Decline of Traditional Cavalry
Nobunaga’s innovative use of arquebuses (teppo) in rotating volleys
devastated the Takeda cavalry charge.
This battle demonstrated that:
- Intelligence and preparation mattered more than raw military power
- Covert operations and scouting were essential to battlefield success
- The age of traditional cavalry warfare was ending
For shinobi, this shift meant their intelligence roles became even
more valuable as warfare evolved.
Timeline of the Battle of Nagashino
1575 May — Takeda Katsuyori besieges Nagashino Castle
1575 May — Torii Suneemon’s infiltration mission
1575 June 21 — Battle of Nagashino begins
1575 June 21 — Nobunaga’s volley fire destroys Takeda cavalry
1575 June 21 — Decisive Oda-Tokugawa victory
Legacy for Ninja Strategy
The Battle of Nagashino accelerated the evolution of shinobi roles:
From open battlefield support → toward pure intelligence operations
From combat assistance → toward espionage and covert missions
As firearms changed warfare, shinobi adapted — becoming even more
specialized in intelligence, infiltration, and survival.