Stone-Drop 犬山城 石落とし

Official explanation

This seemingly innocuous feature of the keep appears from the outside to be a decoration. A section of the wooden wall of the first floor of the castle extends over the stone wall in a slightly curving flare. The unexpected element is that the floorboards are removable and reveal a trapdoor that would allow defenders to observe intruders attempting to scale the steep castle wall from the moat below. Defenders could counterattack by dropping stones or boiling water on the intruders, or by shooting them with arrows or guns.

出典: 地域観光資源の多言語解説文データベース（観光庁） — www.mlit.go.jp/tagengo-db. この英語解説文は観光庁の地域観光資源の多言語解説整備支援事業で作成しました。
Source: Japan Tourism Agency, Multilingual Explanation Database. This English text was produced by the Japan Tourism Agency's multilingual explanation project and is shown unedited. Opening hours and services may have changed since it was written.