He followed Nobunaga, who suddenly rushed out, with only four other vassals: Iwamuro Shigeyasu, Hasegawa Hashisuke, Yamaguchi Hidanokami, and Katō Yasaburo.

In the battle of Dōhora castle, on September 28, 1565, he breached the inner citadel first and forced the enemy commander Kishi Nobuharu to commit suicide.

At this time, he was in charge of patrolling the Oda clan army headquarters, along with Sugaya Nagayori, Harada Naomasa, Nakagawa Shigemasa, and Maeda Toshiie.

On February 19, 1570, Imai Sokyu sent urgent news that Akagi Nobuyasu defeated the army of Miyoshi clan in Awaji province.

In the draft letter, his names are listed alongside Kanamori Nagachika, Takei Yūan, Sakai Kōsai, and Sugaya Naganori, and it can be seen that he was recognized as one of Nobunaga's representative aides at that time.

On March 6, 1570, Nakayama Takachika and Kanroji Tsunemoto visited Nobunaga, but Hidetaka responded due to his absence and received 30 swords as a reward.

In 1582, while planning the Conquest of Kōshū, Nobunaga assigned an army to his eldest son, Oda Nobutada, and had him invade Shinano and Kai Province.