the name ' sanbo ' (literally ' three sides ' ) comes from the fact that there are holes on three sides of the base . 台の三方向に穴があいていることから、「三方」と呼ばれる。
three sides of the heijo property were surrounded by mountains and one open side was facing south , which was considered to be positive according to feng shui . 平城の地は、三方が山に囲まれ南が開け、占いにもかなっている。
however , since the spirits of the hastily-recruited soldiers of the troop led by henmi were lowered seriously under attacks from three sides of hitoyoshi , koriyama and bozuishiyama , and the government army had the overwhelming amount of materials , even the troop led by so brave henmi was defeated , and oguchi fell at last . しかし、人吉・郡山・坊主石山からの三方攻撃の中、寄せ集め兵士の士気の激減と敵軍の圧倒的な物量で、さしもの辺見指揮下の部隊も敗れ、遂に大口は陥落した。
