The Satsuma-Chōshū Alliance was a crucial military and political partnership formed in 1866 between two powerful han (feudal domains) in Japan, Satsuma and Chōshū, aimed at overthrowing the Tokugawa shogunate. This alliance was pivotal in consolidating forces against the shogunate, uniting samurai from both domains to challenge the government’s authority, especially in light of growing discontent fueled by foreign pressures and internal strife. The alliance ultimately played a significant role in the events leading up to the Meiji Restoration.