Battle of Okehazama

A 1560 battle in which Oda Nobunaga’s forces surprised and killed Imagawa Yoshimoto, checking the Imagawa advance and raising Nobunaga’s profile.

Imagawa Yoshimoto: A Japanese daimyō who led the Imagawa clan until his death at Okehazama in 1560. His death during the attack turned a local defeat into a crisis for the Imagawa army.
Suruga Province: A historical province on Japan’s Pacific coast, corresponding largely to eastern Shizuoka Prefecture. It was the Imagawa clan’s central territory and the base of Yoshimoto’s power.
Tokugawa Ieyasu: A Japanese warlord who founded the Tokugawa shogunate after decades of political and military consolidation. After the Imagawa defeat, he gained greater independence and later allied with Nobunaga.
Okehazama: A locality in present-day Aichi Prefecture associated with the 1560 battle between Oda and Imagawa forces. The battle takes its name from this area, though the precise site remains debated.
Oda Nobunaga: A Japanese daimyō who unified much of central Japan through military campaigns and political reforms. He commanded the force that attacked Yoshimoto’s camp and emerged with a stronger position.
Owari Province: A historical province in central Japan, corresponding roughly to western Aichi Prefecture. Nobunaga’s power base lay in Owari, directly exposed to Imagawa expansion.
Kiyosu Alliance: A military alliance between Oda Nobunaga and Tokugawa Ieyasu, formed in the 1560s. The altered balance after Okehazama enabled cooperation between two former rivals.
Atsumori: A Noh play by Zeami about the death of the young Taira warrior Taira no Atsumori. Later accounts associate Nobunaga with performing a passage from this play before the battle.
Surprise attack: A military assault launched before an opponent can prepare an effective defense. Nobunaga’s sudden assault exploited the Imagawa camp’s lack of readiness.
Mikawa Province: A historical province in central Japan, corresponding roughly to eastern Aichi Prefecture. Imagawa influence in Mikawa brought Yoshimoto’s forces into conflict with Owari.

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