On August 28, having learned that a great army of Hojo was coming, 3,000 soldiers led by Tadatsugu SAKAI, who were attacking Takashima-jo Castle of Yoritada SUWA on Hojo's side, backed away, and 43,000 soldiers led by Ujinao HOJO chased them via Saku.
8月1日、北条方となった諏訪頼忠高島城を攻城していた酒井忠次ら3,000は北条の大軍が来るとの報に甲斐に向けて後退し、北条は佐久経由で北条氏直率いる43,000が追撃した。