The Nanbu clan of Honshu surrendered to imperial forces during the Boshin War.

The Nanbu clan was a Japanese samurai clan who ruled most of northeastern Honshū in the Tōhoku region of Japan for over 700 years, from the Kamakura period through the Meiji Restoration of 1868. The Nanbu claimed descent from the Seiwa Genji of Kai Province and were thus related to the Takeda clan. The clan moved its seat from Kai to Mutsu Province in the early Muromachi period, and were confirmed as daimyō of Morioka Domain under the Edo-period Tokugawa shogunate. The domain was in constant conflict with neighboring Hirosaki Domain, whose ruling Tsugaru clan were once Nanbu retainers.

Honshu , historically known as Akitsushima , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the seventh-largest island in the world, and the second-most populous after the Indonesian island of Java.

The Boshin War , sometimes known as the Japanese Revolution or Japanese Civil War, was a civil war in Japan fought from 1868 to 1869 between forces of the ruling Tokugawa shogunate and a coalition seeking to seize political power in the name of the Imperial Court.