Iwai took Hi Province (Hizen Province/Higo Province) and Toyo Province (Buzen Province/ Bungo Province) in control, prevented the advance of the Yamato regime's army, sealed off the sea route between the Korean Peninsula, and captured Choko-sen (ships used especially for paying tribute) crossing from the Korean Peninsula.
磐井は火（肥前国・肥後国）と豊（豊前国・豊後国）を制圧してヤマト政権軍の進軍を妨害し、朝鮮半島との海路も封鎖して、朝鮮半島から来航する朝貢船を押さえた。