Byakkotai Day

What Is Byakkotai Day?

Every August 23rd is "Byakkotai Day" (白虎隊の日, Byakkotai no Hi) in Japan. On August 23, 1868 (the 23rd day of the 7th month of Keio 4), during the Boshin War — the civil war that brought about the Meiji Restoration — twenty young members of the Aizu domain's "Byakkotai" (白虎隊, "White Tiger Corps") climbed Mount Iimori and, believing (mistakenly) that their castle and lord were lost, took their own lives. They were between 15 and 17 years old. Their story has become one of the most poignant and widely remembered tragedies of the Meiji Restoration era.

The Byakkotai: Youth Warriors of Aizu

The Byakkotai were a military unit of young samurai formed by the Aizu domain in 1868 to defend against the Imperial forces advancing to restore direct imperial rule. Aizu was one of the most loyal domains to the Tokugawa Shogunate and resisted the new Meiji government's forces in the Boshin War. The Byakkotai were organized into units by age; the "shi-chū niban-tai" (士中二番隊), whose tragedy is commemorated, consisted of young men 15–17 years old in their first real combat.

The Mistake on Mount Iimori

Separated from their main force during the Battle of Aizu, the 20 young fighters retreated to Mount Iimori overlooking Aizu-Wakamatsu. From there, they saw the castle town burning from fires set by civilian evacuees — and mistakenly concluded that Tsurugajō (the Aizu domain castle) had fallen. Believing their lord and domain were lost, 19 of the 20 performed seppuku (ritual suicide) on the mountaintop. One survivor — Iinuma Sadakichi — was rescued and revived; he lived until 1931 and bore witness to the tragedy for decades.

The Byakkotai in Japanese Memory

The Byakkotai story became one of the most powerful narratives of loyalty, youthful idealism, and tragic sacrifice in Japanese cultural memory. Their graves on Mount Iimori in Aizu-Wakamatsu, Fukushima Prefecture, became a pilgrimage site. The story was taught in prewar schools as an example of samurai loyalty; in the postwar era, it has been revisited as a meditation on the tragedy of young lives consumed by adult conflicts over power.

Fun Facts

• Italian connection: A monument to the Byakkotai was gifted to Japan by fascist Italy in 1928 — a stone column from the Roman Colosseum — as a gesture of solidarity between two nations that idealized martial sacrifice. It stands near the Byakkotai graves and remains historically controversial.
• Tsurugajō: The Aizu castle (Tsurugajō) that the Byakkotai believed had fallen actually held out for another month. The castle was demolished after the war but reconstructed in 1965 and is now a popular historical tourist site.