Advancing along the Tosando to Shinshu, the Tosando-gun army led by Taisuke ITAGAKI (a retainer of the Tosa Domain) and Masaharu IJICHI (a retainer of the Satsuma Domain) sent a detachment led by Taisuke ITAGAKI to Koshu to contain the movement of the former Shogunate forces; the detachment arrived earlier than the Koyo-Chinbutai infantry and seized Koshu Castle.
東山道を進み信州にいた土佐藩士板垣退助・薩摩藩士伊地知正治が率いる新政府の東山道軍は、この動きを封じるために板垣退助が指揮する東山道軍の別働隊を甲州へ向かわせ、旧幕府軍よりも早く甲府城に到着し接収した。