The purpose of sakimori (soldiers deployed for boarder defenses) was to occupy Dazai-fu (the city in Yamato) that was the capital of the Kyushu dynasty, which reflected the policy of the Yamato kingship; `a foreign land must be conquered by foreigners.'
防人の目的は、九州王朝の首都である大宰府（倭京）占領にあり、「夷（異民族）を以て夷を征（制）す」というヤマト王権の政策であった。