The following day, Tokugawa's army attacked Maruko-jo Castle where a neighboring small local ruling family, the Maruko clan, (served Sanada clan later) who sided the Sanada clan was besieged, but again, they were blocked by a fort and robust resistance and kept the position for about twenty days.
翌日、徳川方は近隣の小豪族で真田氏に味方した丸子氏（後、真田氏に臣従）の篭る丸子城を攻めるが、これも要害と頑強な抵抗に阻まれ攻略できず、以後20日間程対陣を続ける。