The was a Japanese military-political coalition established and disestablished over the course of several months in early to mid-1868 during the Boshin War. Its flag was either a white interwoven five-pointed star on a black field, or a black interwoven five-pointed star on a white field. It is also known as the .
History The Alliance centered on the Sendai, Yonezawa, and Nihonmatsu domains, and drew together nearly all domains from the provinces of Mutsu and Dewa, several domains of northern Echigo Province, and even the Matsumae Domain of Ezo (modern-day Hokkaidō). Headquartered at Shiroishi Castle, the alliance's nominal head was Prince Kitashirakawa Yoshihisa, the onetime abbot of Kan'eiji Temple in Edo who fled north following the Satsuma–Chōshū takeover of the city, who declared himself , with Date Yoshikuni of Sendai and Uesugi Narinori of Yonezawa as the head of the Alliance. Although heteroclite in nature, the Alliance formed of a combination of modern and traditional forces, and mobilized a total of about 50,000 soldiers. Though the alliance did its best to support the , Aizu was not formally part of the alliance ; neither was .
In addition, though it technically no longer existed as a domain, the forces of the Hayashi clan of Jōzai Domain also fought on behalf of the Alliance against the Imperial troops.
While the alliance was a bold, innovative step that combined the military forces of several dozen domains, it was unable to fully act as a single, cohesive unit, and with the fall of Sendai and Aizu, it effectively collapsed.
Members of the Ōuetsu Reppan Dōmei
Domain Ruling Family Province Matsumae Matsumae Ezo Morioka Nanbu Mutsu Nihonmatsu Niwa Mutsu Hirosaki Tsugaru Mutsu Tanagura Abe Mutsu Sōma Sōma Mutsu Sendai Date Mutsu Ichinoseki Tamura Mutsu Miharu Akita Mutsu Iwakitaira Andō Mutsu Fukushima Itakura Mutsu Moriyama Matsudaira Mutsu Izumi Honda Mutsu Hachinohe Nanbu Mutsu Yunagaya Naitō Mutsu Miike Tachibana Fukuoka Akita Satake Dewa Yonezawa Uesugi Dewa Shinjō Tozawa Dewa Yamagata Mizuno Dewa Kaminoyama Matsudaira Dewa Honjō Rokugō Dewa Kameda Iwaki Dewa Tendō Oda Dewa Yashima Ikoma Dewa Shibata Mizoguchi Echigo Nagaoka Makino Echigo Murakami Naitō Echigo Muramatsu Hori Echigo Mineyama Kyōgoku Tango Kurokawa Yanagisawa Echigo
References
External links Background on the Ōuetsu Reppan Dōmei More background information