薩長同盟
The Tsugaru first sided with the pro-imperial forces of Satchō Alliance, and attacked nearby Shōnai Domain. However, the Tsugaru soon switched course, and briefly became a member of the Ōuetsu Reppan Dōmei. However, for reasons yet unclear, the Tsugaru backed out of the alliance and re-joined the imperial cause after a few months.