The defensive aspect can be seen by the way moats were dug down, steeply to a point at the bottom making it shaped like a "V," being accompanied with abatis called Sakamogi, which are kind of stakes with sharpened tops directed outwards, along its sidelines.
断面が深くV字形に掘削された環濠やその周辺に逆茂木（さかもぎ）と称されるような先を尖らせた杭を埋め込んでいる様子から集落の防御的性格があったことが窺える。