Kanesada established headquarters in the Kurimoto Castle on the west bank at the mouth of the Shimanto-gawa River, and prepared for the enemy's attack by planting stakes and utilizing the geography.
四万十川河口部の西岸、栗本城に本陣を構えた兼定は四万十川に杭を打ち込ませ、地形を利用した迎撃の用意をはじめた。