Later that year, Fujitaka, along with Shibata Katsuie, Hachiya Yoritaka, Mori Yoshinari, and Sakai Masahisa, attacked Iwanari Tomomichi at Shōryūji Castle.

In 1569, after Nobunaga and his followers returned from Kyoto, the Miyoshi clan attacked Shōgun Ashikaga Yoshiaki at Honkokuji Castle.

In 1576, Fujitaka participated in the ten-year campaign against the Ikkō-ikki during the Ishiyama Hongan-ji War, alongside Harada Naomasa, Akechi Mitsuhide, and Araki Murashige.

In 1577, Fujitaka, along with Akechi Mitsuhide and Tsutsui Junkei, rendered distinguished service during the Siege of Shigisan against Matsunaga Hisahide, who had revolted against Nobunaga.

Later, Fujitaka shaved his head in the Buddhist tonsure, changed his name to the priestly "Yūsai", and delegated his status as daimyō to Tadaoki.

This conspiracy arose from the dissatisfaction of the generals with Mitsunari, who they felt had underreported their achievements during the Imjin War against the Korean and Chinese empires.

However, Mitsunari learned of their plans through a report from a servant of Toyotomi Hideyori named Jiemon Kuwajima and fled to Satake Yoshinobu's mansion, accompanied by Shima Sakon and others, to hide.

Ieyasu negotiated a promise to allow Mitsunari to retire and to review the assessment of the Battle of Ulsan Castle in Korea, which was a major source of contention.