Before dawn of May 26, an attack troop with a strength of 60 led by Tomofusa SASSA and Kazumi FUKANO raided the government army in Mt. Yahazu but was pushed back by gun attacks, and the Kumamoto-tai troop was forced to retreat to Oguchi.
対して26日未明、佐々友房・深野一三らが指揮する約60名の攻撃隊が矢筈岳の官軍を急襲したが、官軍の銃撃の前に後退し、熊本隊はやむなく大口へと後退した。