On December 27, Kakegawa-jo Castle was surrounded by the Tokugawa army, but senior vassals headed by Yasutomo and others struggled for almost half a year in a defensive battle in which they confined themselves within the castle.
12月27日には徳川軍によって掛川城が包囲されたが、泰朝をはじめとした家臣たちの奮闘で半年近くの籠城戦となった。