Why “Theory 1: A defensive facility from the Sengoku period” is not decisive

If it were a defensive facility meant to protect a roadside settlement, this stone rampart does not connect to the old road used at the time, the Nakamichi Okan. There is also a mountain castle nearby called Motosu no Shiroyama, but the rampart is far from it, and no sense of connection can be felt.

Stone ramparts around Shiroyama

Furthermore, the way the stones are stacked is different. Stone ramparts related to the Nakamichi Okan are built very carefully, almost like brickwork, but this rampart is stacked in a very simple manner. Because of this, its purpose may have differed from that of the castle ramparts at Shiroyama.