He had burned his own castle first.

On March 3, 1582, 武田勝頼 (Takeda Katsuyori) set fire to 新府城 (Shinpu-jō) — his seat of power, the symbolic center of the 武田 (Takeda) domain — and fled east into the mountains of 甲斐 (Kai) Province with roughly five hundred samurai and more than two hundred women and children from his household. Noble hostages from allied families were left inside to burn. The gesture was not dramatic; it was desperate. There was nothing left in Shinpu worth defending.

The collapse had been building for seven years. At the Battle of 長篠 (Nagashino) in 1575, 織田信長 (Oda Nobunaga) and 徳川家康 (Tokugawa Ieyasu) had torn the Takeda cavalry apart with disciplined volleys of arquebuses fired from behind wooden palisades. The charge of Takeda horsemen — the most feared military force in eastern Japan for a generation — broke against gunpowder and patience. Most of 信玄 (Shingen)'s legendary Twenty-Four Generals died that day. Katsuyori had survived and held what remained of the clan together for seven more years, fighting rearguard actions, trying to keep the Takeda name alive.

In 1582, Nobunaga had finally moved in force. His armies poured into Kai from multiple directions. The Takeda's allies crumbled or defected. Men who had served the clan for decades began calculating their own survival.

小山田信茂 (Oyamada Nobushige) was the most devastating of these calculations. He had been one of Takeda Shingen's most trusted commanders — a Twenty-Four General, one of the men who had helped make the Takeda name synonymous with military excellence in eastern Japan. He controlled a mountain castle called Iwadono or Kogakubo, deep in Kai's forested highlands. When Katsuyori's situation began to collapse, Oyamada had sent word personally: come to me, I will shelter you.

Katsuyori trusted the invitation. He marched his diminishing column through winter mountain terrain toward a gate he believed would be open.

The gate was closed. Oyamada had secretly defected to Nobunaga. He stood at the walls and turned Katsuyori away.

What followed was the final arithmetic of 滅亡 (metsubō) — ruin. Katsuyori had no castles, no reinforcements, and fewer men by the hour as samurai drifted away into the mountain forest rather than die for a losing cause. He established a temporary camp at Tano village, near the slopes of 天目山 (Tenmokuzan), in the mountains of Kai. On March 11, 1582, Oda forces under 滝川一益 (Takigawa Kazumasu) located the camp and surrounded it.

Katsuyori committed suicide. So did his wife, 北条殿 (Hōjō-dono) — daughter of 北条氏康 (Hōjō Ujiyasu), lord of Odawara, a woman who had been married to Katsuyori as a strategic alliance between two great houses and who died on a mountainside far from the castles of the Hojo. So did their sixteen-year-old son 信勝 (Nobukatsu), who had never commanded an army and never would.

Forty-one samurai remained. These were not young hotheads — they were the last survivors of one of Japan's most storied military traditions, men who had trained in the 武田 (Takeda) style, who carried in their bodies the institutional memory of a clan that had terrorized eastern Japan for a generation. They made their final decisions quickly. They executed their wives and children rather than leave them alive to face capture. Then they drew their swords and charged the surrounding Oda forces.

Every one of them died.

The chronicle that recorded their deaths was the 信長公記 (Shinchō Kōki) — the official account of Nobunaga's campaigns, written to celebrate his conquests. Its account of 天目山 (Tenmokuzan) was not triumph. It was something closer to admiration. The forty-one final Takeda samurai, the chronicle wrote, had "earned unparalleled fame and renown for themselves in death."

Even the victors could not help but note what they had seen.

Oyamada Nobushige, who had closed the gate, was executed by Nobunaga's officer 堀尾吉晴 (Horio Yoshiharu) shortly after the battle. His betrayal had bought him nothing. The men he betrayed died with their reputations intact; the man who betrayed them died without his.

The 武田 (Takeda) clan was finished. Nobunaga absorbed Kai Province. The last resistance scattered. Tokugawa Ieyasu, who had fought alongside Nobunaga at Nagashino seven years earlier, moved to claim territories the Takeda had long contested.

Then, within three months, Nobunaga himself was dead — assassinated at 本能寺 (Honnō-ji) temple in Kyoto by his own general 明智光秀 (Akechi Mitsuhide) on June 21, 1582. The man who had destroyed the Takeda did not live to see the Japan he was building. The vacuum his death created would eventually be filled by 豊臣秀吉 (Toyotomi Hideyoshi) and then by Tokugawa Ieyasu, who would unify Japan and establish the Edo period.

The forty-one who charged at 天目山 (Tenmokuzan) did not know any of this. They knew only what was in front of them: the end of everything they had served, and the choice of how to meet it.