After the Battle of Nagashino, when Takeda was barred from Mikawa, the Oda forces having Nobunaga's heir Nobutada who had Nobunaga's order, as the supreme commander, took control of Iwamura-jo Castle in Higashi Mino Province and Katsuyori lost Nobutomo AKIYAMA, the general of the guards of the castle.
長篠合戦後、三河から武田方が締め出されたのを皮切りに、信長の下命を受けた嫡男・信忠を総大将とした織田軍によって東美濃国の岩村城を陥落させられ、城将である秋山信友を失った。