The 1585 was one of a series of assaults made by Toyotomi Hideyoshi against the Ikkō-ikki religious zealots towards the end of Japan's Sengoku period. This battle followed the siege of Negoro-ji, in which Hideyoshi's forces burnt a temple complex to the ground; a number of the Saiga Ikki zealots escaped to nearby Ōta Castle, which was held by Ōta Munemasa.