During the Genpei Wars of 1183, Minamoto-clan warriors Kajiwara Kagesue (1162-1200) and Sasaki Takatsuna (dates unknown) competed to see who could be the first to cross the Uji River and lead the Minamoto forces to route the army of Taira warrior Kiso Yoshinaka (1154-1184). Mounted on two of Minamoto no Yoritomo's best horses, Kagesue and Takatsuna took off into the shallows of the river. Takatsuna won the challenge by tricking Kagesue into stopping to tighten his saddle girth. Kagesue is depicted on the box lid struggling to tighten the saddle girth while holding his bow by the bowstring clenched in his teeth.
Ishikawa Wajima Urushi Art Museum, ed., Kindai no shitsugei (Modern lacquer art), exh. cat. (Wajima: Ishikawa Wajima Urushi Art Museum, 1997), no. 47, p. 36.
Shiraishi Masami, Seiko na gijutsu hanayaka na soshoku (Elaborate art and gorgeous adornment), in Kobijutsu Rokusho no. 15 (Kyoto: Mariashobo, 1995), no. 18.