When many of Ieyasu's vassals seceded because of the Ikko Ikki uprising in Mikawa, Ujizane took this opportunity and dispatched his troops to Ushikubo-jo Castle, but he was beaten off.
氏真は、家康が三河一向一揆で多くの家臣団に離反されたことに乗じて牛久保城に出兵したが撃退されている。