According to archaeological findings, a general josaku was consisted of an office mounted on an elevated hill, around which the residents of soldiers were located, with earthen walls and fences made of lumber around them, as wells as watchtowers to reinforce defenses.
考古学上の成果によると、一般的な城柵は小高い丘上に官衙が設置され、その周辺に鎮兵の住居を配置し、周囲を土塁、材木列塀などを巡らし、望楼を設けて防御を固めている。