The Battle of Okehazama (桶狭間の戦い, Okehazama-no-tatakai^?) took place in June 1560. In this battle, Oda Nobunaga defeated Imagawa Yoshimoto and established himself as one of the front-running warlords in the Sengoku period.^{[citation needed]}

In May or June 1560, Imagawa Yoshimoto, with an army of perhaps 35,000 men, set forth on a march to Kyoto. Entering the Oda territories in Owari Province, he first took the border fortresses of Washizu and Marune before setting up camp in a wooded gorge known as Dengaku-hazama. This was all reported to Oda Nobunaga by his scouts and, in response, Nobunaga then led his own forces into position at a temple called Zenshōji, a short distance away, on the other side of the Tōkaidō.

Had Nobunaga decided on a frontal assault, the battle would have been deceptively easy to predict; his army was outnumbered ten to one by the Imagawa forces. A frontal assault would be suicidal and an attempt to hold out at Zenshō-ji would only last a few days. Because of the odds against their side, some of Nobunaga's advisers even suggested a surrender. Nobunaga, however, decided to launch a surprise attack on the Imagawa camp. When he made his decision, he gave this speech: