How a tiny force toppled a giant army in a single afternoon
In 1560, Oda Nobunaga faced an impossible choice: surrender his lands or attack an army ten times the size of his own. By leveraging local terrain and a sudden thunderstorm, he executed a daring strike that shattered the Imagawa clan and fundamentally altered the course of Japanese history forever.
In June 1560, Imagawa Yoshimoto marched toward Kyoto with 25,000 men, intending to challenge the Ashikaga shogunate. His path took him through Owari Province, recently unified by Oda Nobunaga. Despite being outnumbered ten-to-one, Nobunaga rejected calls to retreat to Kiyosu Castle, opting instead for a high-risk offensive strategy. He relied on his intimate knowledge of the local terrain, which his scouts had frequently traversed under the guise of falconry hunts.
On the morning of June 12, Nobunaga departed from Kiyosu, stopping at Atsuta Shrine before reaching the temple of Zenshō-ji. To deceive Imagawa scouts, he ordered his men to display numerous banners, creating the illusion of a larger force. The Imagawa, meanwhile, were celebrating their early successes. As the afternoon heat intensified, many soldiers removed their armor, leaving them vulnerable when a thunderstorm provided the perfect cover for the Oda forces to launch a surprise attack on the camp at Dengaku-hazama.
The ensuing chaos caused the Imagawa ranks to break. Contrary to popular belief, Yoshimoto was not killed in his tent; he fled the camp as the attack unfolded. He was eventually intercepted by Oda samurai Mōri Shinsuke and Hattori Koheita. After a brief melee, Koheita successfully took Yoshimoto's head. With their leader and nearly all senior officers dead, the Imagawa army collapsed. This victory cemented Nobunaga's status as a premier warlord, attracting new allies like Matsudaira Motoyasu and discovering the talents of Kinoshita Tōkichirō, the future Toyotomi Hideyoshi.
While the traditional narrative suggests a complex flanking maneuver, modern historians often debate the specifics, noting that the battle's history has been heavily embellished by legend. Some argue the engagement was a frontal assault, either intentional or accidental. Regardless of the tactical nuances, the battle remains a pivotal turning point, marking the decline of the Imagawa clan and the rise of Nobunaga's power during the Sengoku period.
Source: Battle of Okehazama
