Tsunehisa intruded to the back of the Castle on the new year's eve, while the defense of soldiers of Gassantoda Castle was down, and broke into the castle with the Gama-to party as a guide, after firing guns to stun people inside.
兵の気が緩んでいる内に経久は大晦日から富田城の裏手に潜み、火薬の詰まった武器を轟音発して城内の者を驚かせた後、賀麻党の手引きにより城中に切り込んだ。