Sarushima was one of the locations fortified with coastal artillery during the Bakumatsu period and was subsequently incorporated into the Tokyo Bay Fortress during the Meiji period.
Sarushima merupakan salah satu lokasi yang dilindungi oleh artileri pesisir selama Periode Bakumatsu dan kemudian tergabung dalam Benteng Teluk Tokyo selama Periode Meiji.