Therafter, Kunisada also allied himself with Nagayoshi MIYOSHI and resisted the Hatano clan with the help of the Yakami-jo Castle, but was killed in battle in September 1553, bringing about the downfall of the Naito clan as Warring loads.
その後、国貞も三好長慶と組み八木城によって抵抗するものの1553年9月内藤国貞の戦死で戦国大名としての内藤氏は滅んだ。