In this battle, Oda Nobunaga defeated ImagawaYoshimoto and established himself as one of the front-running warlords in the nationwide conflict that characterized the Sengoku period.
The Imagawa army did not expect an attack, and were particularly not alert as a result of the incredible heat.
ImagawaYoshimoto, unaware of what had transpired, heard the noise and emerged from his tent shouting at his men to quit their drunken revelry and return to their posts.