This was an unusual field fornication in then Japan as the river banks were cut to create steep escarpments and a stockade was erected on the triple mound.
これは、川を挟む台地の両方の斜面を削って人工的な急斜面とし、さらに三重の土塁に馬防柵を敷くという当時の日本としては異例の野戦築城だった。