When Toshizo HIJIKATA was killed in Hakodate War, he was there and entrusted to deliver a letter to the Hijikata family from Saisuke YASUTOMI, rikugunbugyo soeyaku (a person who support the army leader conveying the command or giving instructions).
箱館戦争にて土方歳三の戦死に居合わせた立川は、陸軍奉行添役安富才助より土方家への手紙を託された。