In 724 in the period of Emperor Shomu, 30,000 soldiers of the military located in nine countries of Bando (old Kanto region) started to take lessons in Kisha (to shoot an arrow with riding a horse) and received training in gunjin (battle array).
聖武天皇神亀元年（724年）には、坂東9カ国の軍三万が騎射の教習と軍陣の訓練を受けるようになった。