On May 27, 1582, Nagayoshi crossed the border between Shinano and Echigo Provinces to support the armies of northern provinces, including Katsuie SHIBATA's army, and invaded into the area around Nihongi (present-day Joetsu City) in Echigo Province, from where Kasugayama-jo Castle could be seen at a short distance.
5月27日には柴田勝家らの北国勢の支援のために信越国境を越えて、春日山城を指呼の間に望む越後国の二本木（上越市）辺りまでに乱入。