Alternate History

Boshin War (Treaty of Amiens Map Game)

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Japanese Civil War

戊辰戦争 Boshin Sensō (Japanese)

Guerra Civil Japonés (Spanish)

March 1807


October 1808




Imperial victory; reunification of Japan under the Shogun

Major battles:

Battle of Fukushima, Battle of Satsuma


Flag of the Tokugawa Shogunate Empire of Japan
Flag of the United States United States of America (1808)
Flag of Spain (1785-1873 and 1875-1931) Spanish Empire (limited support)

Domain Alliance


Tokugawa Ienari

Shizamu Narioko✝


5 naval fleets
10 battalions

3 battalions

Casualties and Losses

1,200 killed
205 wounded
1 frigate

4,350 killed
5,340 wounded

The Japanese Civil War, known in Japanese as the Boshin War, was the last civil war in Japan before the collapse of the feudal system. Seeds for the war were planted when the Shogun Tokugawa Ienari announced plans to modernise and industrialise Japan with the help of western nations. Many daimyo were against this, and formed a 'reactionary coalition' known as the Domain Alliance to establish a new isolationist shogunate under Shizamu Narioko. After Shizamu was declared Shogun by the Domains, Tokugawa declared war on the Alliance, beginning the civil war.

In early 1808, an American convoy carrying supplies and military advisors to Edō was attacked by the Domain Alliance, creating a pretext for direct American intervention in the war. With American and limited Spanish support, the Tokugawa shogunate toppled the Alliance and restored rule from Edō in the rebelling Domains.

Currently, a peace treaty is being negotiated in Sapporo.

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