chōsokabe motochika proposed a withdrawal, but his companions insisted on doing battle, so the shimazu set their trap. the decoy force led by ijuin hisanori attacked across the river and then withdrew, which persuaded the allied left wing to follow them. they were met by arquebus and arrow fire, and the main body of the shimazu then fell upon them. after much fierce fighting the invading force withdrew across the river and caused confusion to its own right wing. chōsokabe motochika was obliged to signal a full retreat, during which his son and heir nobuchika was killed.