Most elements of the Japanese Second General Army headquarters were undergoing physical training on the grounds of Hiroshima Castle, barely 900 yards (820 m) from the hypocenter.
Sebagian besar pasukan markas Angkatan Darat Umum Kedua Jepang sedang menjalani latihan fisik di lapangan Istana Hiroshima, sekitar 900 yard (820 m) dari hiposentrum.