Ujizane headed to Seiken-ji Temple of Okitsu in order to ambush the Takeda army at Satta Pass, however, because 21 influential countrymen such as Nobuteru SENA, Ujimoto KATSURAYAMA, Masasada ASAHINA and Yoshikane MIURA were communicating with Shingen, the Imagawa army faced a debacle and Sumpu was quickly occupied on December 13th.
氏真は武田軍を薩埵峠で迎撃すべく興津の清見寺に出陣したが、瀬名信輝や葛山氏元、朝比奈政貞、三浦義鏡など駿河の有力国人21人が信玄に通じたため、12月13日に今川軍は潰走し駿府もたちまち占領された。