The truncheon art of Ikkaku-ryū
Ikkaku-ryū juttejutsu (一角流十手術) is a Japanese school of the jutte, the iron truncheon used to parry and control a drawn blade. It grew from an art of seizing and arresting, and the truncheon and iron fan at its heart were the tools of the men charged with taking an armed opponent alive. The school survives as one of the auxiliary arts carried within Shintō Musō-ryū.
A contested founding
The school's own transmission names its founder variously as the teacher Ikkaku, as Gondō Kakuemon, or as his pupil Kotani Sōemon, so that no single figure can be established with confidence. Ryūpedia records the disagreement rather than resolving it, and notes that the tradition is sometimes confused with the separate line of Shintō Musō-ryū's own truncheon and rope methods.
To take an armed opponent alive rather than to kill him.
Carried in the Fukuoka domain
Ikkaku-ryū was handed down in the Fukuoka domain as one of the seizing arts learned chiefly by the lower samurai, and it is preserved today alongside the jō staff of Shintō Musō-ryū. Through that companionship the truncheon art remains a living tradition rather than a closed chapter.