In maturity, Ujinao held junior 5th court rank, lower grade (ju-go-i-ge) and the title Sakyō-dayu.

Amidst the chaos, Oda retainers who were assigned by Nobunaga to govern those territories, such as Mori Nagayoshi and Kawajiri Hidetaka amongst others, either fled or were killed by local insurrection.

[citation needed] In 1582, after the death of Oda Nobunaga, He and the Hōjō family took the advantage of the situation to launch invasion to the Kai and Shinano province.

Ieyasu invaded Kai and Shinano province to establish control there on the consent from senior vassals of Oda clan.

[4] This caused the triangle conflict between those three factions in the event which dubbed by historians as Tenshō-Jingo War broke out.<[5][a] By June 13, the Hōjō clan had captured Iwadono Castle in Tsuru District, and instructed Watanabe Shozaemon, a local magnate from Tsuru District to assist them in their conquest.

[8] Subsequently, Sanada Masayuki led his army and received Numata Castle to the Uesugi clan.

[1] In response, on July 7, 1582, Toyotomi Hideyoshi sent a letter to Ieyasu authorizing him to dispatch troops to secure the two provinces of Kai and Shinano.

[12][13] On July 12 as the troops under Ujinao advanced across Usui Pass, Nobushige resisted them, abandoned the Komoro Castle, and retreated to a fortress which he deemed more suitable to defend against the Hōjō army.

[25] In 1590, Odawara fell to siege at the hands of Toyotomi Hideyoshi; his father and uncle were forced to commit suicide, but Ujinao was spared because he was Tokugawa Ieyasu's son-in-law.