It resulted in the downfall of the Northern Fujiwara and the completion of Minamoto no Yoritomo's nationwide domination through the annexation of Mutsu and Dewa Province by the Kamakura shogunate.

[4] Hidehira had remained neutral during the Genpei War, but when Yoshitsune took refuge in Hiraizumi, he decided to protect him.

Yasuhira failed to resist Minamoto no Yoritomo's pressure, and had Yoshitsune assassinated[3] during the Battle of Koromo River on June 15, 1189.

[5] Yoshitsune's severed head was delivered by Fujiwara no Takahira to Kamakura for Yoritomo to see and arrived on July 7.

[4] On August 8, Yoritomo requested the Imperial Court in Kyoto to order the punitive expedition of Fujiwara no Yasuhira.

Following the request, the next day, a revolt took place in Ōshū resulting in the death of Fujiwara no Tadahira, who had supported the protection of Yoshitsune as the son of Hidehira.

[5] The central forces, led by Yoritomo himself, advanced towards the north, and arrived at Kotahashi Station in Shimotsuke Province on September 7.

On September 10, Yoritomo arrived at Nitobe Station and over 200 retainers of Jō Nagamochi joined the army.

Yasuhira was forced to abandon his main military base at Kokubugahara Muchidate (present-day Tsutsuji-gaoka, Sendai).

[5] The next day, Yasuhira was caught by Yoritomo's forces north of Hiraizumi, and was killed by Kawada Jirō in Nienosaku, Hinai, Mutsu Province (present-day Ōdate, Akita Prefecture).

[4] The Battle of Ōshū resulted in the victory of Minamoto no Yoritomo and his forces and the defeat of the Northern Fujiwara.

This marked the end of the period of civil war that began in 1180, and the completion of Yoritomo's nationwide domination through the annexation of Mutsu and Dewa Province by the newly established Kamakura shogunate.

Yoritomo met with Korehira because of his bravery and told him, "Yasuhira was wielding power in Ōshū and I thought it would be difficult to punish him, but he was put to death by Kawada Jirō alone because he did not have a good attendant.

Korehira responded, "The former Head of Left Division of Bureau of Horses [Minamoto no Yoshitomo] ruled fifteen provinces by the Tōkaidō, but he could not sustain himself for a single day during the Heiji Rebellion and fell, though he was the commander of tens of thousands of cavalrymen, Nagata Tadamune killed him.

[7] On October 20, Ichijō Yoshiyasu sent a court order for the punitive expedition of Yasuhira from Kyoto to Yoritomo in Jingaoka, which was dated September 1, 1189.

[6] On October 22, Yoritomo left Jingaoka to stay at Kuriyagawa Barrier, and eight days later, he headed to Hiraizumi.