Japan's Shinobi: Iga Guilds, Nightingale Floors and Kabuki's Black Ninja

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The shinobi of the Sengoku period wore dark indigo or brown farm clothes, not black, and spying and arson mattered more to them than assassination. Their name, shinobi no mono, meaning one who steals away, appears as early as the 8th century poetry collection the Man'yōshū, and regional slang called them kusa, grass, or nokizaru, macaque on the roof. They came from the remote mountain districts of Iga and Kōka, where peasant warriors formed defense leagues and, by the 15th century, a guild run by jōnin who negotiated contracts, chūnin who managed logistics and genin who carried out the missions. In 1558 a team of 48 shinobi copied a captured lantern bearing the defenders' crest, walked through the gates of Sawayama Castle and burned it from inside.

Oda Nobunaga invaded Iga in 1581 and broke the guilds. The Edo period story that Hattori Hanzō led 300 Iga and Kōka shinobi to escort Tokugawa Ieyasu home in 1582 is challenged by historian Tatsuo Fujita, who finds his generals bribed their way through, and he ties the legend to Tokugawa Yoshimune recruiting their descendants into his Oniwaban. With peace, former shinobi became guards, fireworks makers, apothecaries or outlaws, and Kabuki playwrights dressed stage assassins as the black clad kuroko stagehands audiences were trained to ignore.

• In 1561 at a fortress in Maibara, hired Iga operatives threatened to quit rather than follow a conventional battle schedule.
• Nightingale floors at Nijō Castle used iron clamps rubbing on nails so any footstep chirped.
• At the 1637 to 1638 siege of Hara Castle, Kōka shinobi measured moat depths and stole the rebels' food and passwords.
• Excavations at the site of the 1590 siege of Odawara found rough throwing stones and clay caltrops.
• A 1748 manuscript found in a Kōka shrine storehouse in 2022 pairs cotton padded sandals with charred owl and turtle powder for hiding.