On April 8, the garrison was divided into three groups of the Totsui-tai troop led by Major Yasukata OKU, the Shinshu-tai troop led by Captain OGAWA, and Reserve, and sortied.
隊を奥保鞏少佐率いる突囲隊、小川大尉率いる侵襲隊、及び予備隊の3つに分け、4月8日に出撃した。