They united and fought against invasion from outside, when Nobunaga ODA sent Katsutoshi TAKIGAWA, a Chikujo Bugyo (magistrate of building a castle), Katsutoshi TAKIGAWA to control Iga Province, they dismissed him, and also eliminated Nobukatsu ODA's army who invaded in retribution (the first Tensho Iga War).
外部からの侵略に対しては結束して戦い、織田信長が伊賀国を支配するために送り込んだ築城奉行・滝川雄利を追放、その報復として攻め込んできた織田信雄の軍も彼らは壊滅させている（第一次天正伊賀の乱）。