The Tosando-gun army of the new government, which had advanced to Sumpu, decided at a council of war on March 29 to launch a full-scale attack on Edo Castle on April 7 and began preparing for it.
駿府に進軍した新政府の東海道軍は、3月6日の軍議において江戸城総攻撃を3月15日と定め、準備を始めた。