The Battle of Ōshū ended the Jishō-Juei War and established the Kamakura shogunate as Japan's first military government.
Key Facts
- Start date
- September 1, 1189
- End date
- October 14, 1189
- Duration
- Approximately 44 days
- Region
- Tōhoku, Japan (Mutsu and Dewa Province)
- Conflict series
- Final battle of the Jishō-Juei War (began 1180)
By the Numbers
Location
Cause → Event → Consequence
Minamoto no Yoritomo sought to extend Kamakura authority across all of Japan. The Northern Fujiwara clan, based in the Tōhoku region, had harbored Yoritomo's rival Minamoto no Yoshitsune, providing Yoritomo a pretext to mobilize his forces against them and annex the northern provinces.
From September 1 to October 14, 1189, the Kamakura government launched a major military campaign against the Northern Fujiwara in the Tōhoku region. The Kamakura forces overwhelmed the Northern Fujiwara, defeating them decisively and bringing the northern domains of Mutsu and Dewa Province under shogunate control.
The defeat of the Northern Fujiwara marked their complete downfall and the annexation of Mutsu and Dewa Province by the Kamakura shogunate. This victory completed Minamoto no Yoritomo's nationwide domination, concluded the Jishō-Juei War, and consolidated the establishment of Japan's first military government.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Minamoto no Yoritomo.
Side B
1 belligerent