The Battle of Bonari Pass (Japanese: ) was part of the

Boshin War The , 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 clique seeking to seize political power in the name of the Imperi ...

, and occurred on the 6 October 1868 (Gregorian Calendar), or the 21st day of the Eighth Month,

Keiō was a after '' Genji'' and before '' Meiji''. The period spanned the years from May 1865 to October 1868. The reigning emperors were and . Change of era * May 1, 1865 (''Genji 2/Keiō 1, 7th day of the 4th month'') : The new era name of ''K ...

-4 year (

Japanese calendar Japanese calendar types have included a range of official and unofficial systems. At present, Japan uses the Gregorian calendar together with year designations stating the year of the reign of the current Emperor. The written form starts with t ...

). The Bonari pass was a strategic access at the limit of the fief of

Aizu is the westernmost of the three regions of Fukushima Prefecture, Japan, the other two regions being Nakadōri in the central area of the prefecture and Hamadōri in the east. As of October 1, 2010, it had a population of 291,838. The princip ...

. The battle opposed a mixed force of 800 troops- including former shogunate soldiers (

Denshūtai The was a corps of elite troops of the Tokugawa Bakufu during the Bakumatsu period in Japan. The corps was founded by Ōtori Keisuke with the help of the 1867–68 French Military Mission to Japan. The corps was composed of 800 men. They w ...

and

Shinsengumi The was a special police force organized by the (military government) during Japan's Bakumatsu period (late Tokugawa shogunate) in 1863. It was active until 1869. It was founded to protect the shogunate representatives in Kyoto at a time when ...

) led by

Ōtori Keisuke was a Japanese military leader and diplomat.Perez, Louis G. (2013)"Ōtori Keisuke"in ''Japan at War: An Encyclopedia,'' p. 304. Biography Early life and education Ōtori Keisuke was born in Akamatsu Village, in the Akō domain of Harima Pro ...

and

Hijikata Toshizō was a Japanese warrior. As of the ''Shinsengumi'', he resisted the Meiji Restoration and fought to his end. Background was born on May 31, 1835, in the Ishida village, Tama region of Musashi Province (present day Ishida, Hino, Tokyo), Jap ...

, Aizu forces, and soldiers of various northern domains—to 7000 troops favourable to the Imperial government. Outnumbered, the shogunal troops had to retreat to the North to

Sendai is the capital Cities of Japan, city of Miyagi Prefecture, the largest city in the Tōhoku region. , the city had a population of 1,091,407 in 525,828 households, and is one of Japan's 20 Cities designated by government ordinance of Japan, desig ...

, where the fleet of

Enomoto Takeaki Viscount was a Japanese samurai and admiral of the Tokugawa navy of Bakumatsu period Japan, who remained faithful to the Tokugawa shogunate and fought against the new Meiji government until the end of the Boshin War. He later served in the Mei ...

was ready to evacuate them to

Hokkaidō is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The la ...

. This left Aizu exposed, and facilitated the imperial advance. Three days later, the Imperial troops reached the castle of Wakamatsu and laid siege to it, in the key action of the

Battle of Aizu The Battle of Aizu (Japanese: 会津戦争, "War of Aizu") was fought in northern Japan from October to November in autumn 1868, and was part of the Boshin War. History Aizu was known for its martial skill, and maintained at any given time a s ...

References

{{Ōuetsu Reppan Dōmei Bonari Pass 1868 in Japan Bonari Pass Bonari Pass October 1868 events