The Women in the Armor: How Bone Analysis Is Restoring the Onna-Musha to History

For centuries, the image of the samurai has been almost entirely male. Films by Kurosawa. Novels by Clavell. Museum exhibits behind glass. The warrior code of bushido, the disciplined swordsman, the lone ronin — all of it rendered in a single gender. The samurai, we were told, was a man. Full stop.

Except the bones say otherwise.

Analysis from 16th-century Japanese battle sites, including the site of the Battle of Senbon Matsubaru, has found that a significant number of the remains belonged to women^◆. At some sites, researchers estimate women may have made up 30 to 50 percent of those buried among the fallen^◆. These were not camp followers or bystanders caught in crossfire. These were combatants — armed, trained, and dead on the field alongside their male counterparts.

These findings align with historical records of the onna-musha — women from samurai families who were trained in weapons such as the naginata, a long-bladed polearm, as well as the bow, the kaiken dagger, and the art of tantōjutsu. They were not anomalies or exceptions. They were an expected part of the defense of their communities, particularly in times when male fighters were away or outnumbered. They trained. They fought. They bled into the same soil.

As Josh Jones wrote for Open Culture, drawing from the Vintage News^◆: 'And yet, it turns out, such women did exist.' Known as onna-bugeisha, these fighters 'find their earliest precursor in Empress Jingū, who in 200 A.D. led an invasion of Korea after her husband Emperor Chūai, the fourteenth emperor of Japan, perished in battle.' Jingū's example was not a footnote — in 1881, she became the first woman to appear on Japanese currency^◆. Her legacy endured for nearly two millennia before being quietly folded into myth.

The onna-bugeisha were not a hidden cult or a secret society. They preceded the all-male samurai class that later solidified in the Edo period, when Tokugawa rule rigidified gender roles and confined women's martial training to household defense. Before that codification, women fought openly. Tomoe Gozen, one of the most celebrated warriors of the Genpei War in the 12th century, was described in The Tale of the Heike as 'a remarkably strong archer, and as a swordswoman she was a warrior worth a thousand.'^◆ Nakano Takeko led a unit of women into the Battle of Aizu in 1868 during the Boshin War^◆ — the last stand of the old samurai order. Historical accounts suggest her unit had been ordered to stay behind the front lines, but when the crisis came, they charged.

This is not history being rewritten. It is history being restored.

The distinction matters. To rewrite is to impose something new onto the past. To restore is to remove what was layered over it — the assumptions, the erasures, the convenient simplifications that turned a complex warrior tradition into a single-gender story. The bones at Senbon Matsubaru did not change. The women were always there. It was the telling that left them out.

It is worth noting the scientific nuance: the analysis that identified female remains at these battle sites was based on osteological examination — the study of bone structure, size, and morphology — not DNA analysis^◆. Earlier reports citing DNA findings have been corrected by researchers. The bones themselves, their structure and wear patterns, told the story. In some ways, this makes the evidence more poignant. These women's bodies bore the physical marks of combat training and warfare. Their bones knew what they had done, even when the histories forgot.

The British Museum's recent exhibitions on samurai culture have begun to incorporate women's roles more prominently^◆, acknowledging that the defense of home and village was not a lesser form of martial service but an integral part of the warrior class's function. The naginata, long associated with women's martial training, was not a decorative tradition — it was a battlefield weapon, and the women who wielded it were taught to kill with it.

There is a pattern in how history treats women warriors. First, they are present — fighting, leading, dying. Then the record narrows. Codification happens: laws, customs, cultural narratives that assign gender to valor. The women are moved to the margins, then to the footnotes, then out of the story entirely. And then, centuries later, someone digs — literally, in the case of Senbon Matsubaru — and finds them exactly where they always were.

The onna-musha do not need us to believe in them. They are in the ground. They are in the records. They are in the weapon forms still taught today. What they need is for the story to stop being told as though they were never there.

Queens never die. Sometimes they just have to wait for the world to look at the bones.