The Engishiki (an ancient book for codes and procedures on national rites and prayers) compiled in the 10th century also specified the deployment of seven troops in Mutsu Province, but there are no historical materials to directly support their activities.
10世紀に編まれた延喜式にも陸奥国に7団を置くことが規定されているが、その活動を直接裏付けるような史料はない。