Trou de loup

Common card · No. 492090

In medieval fortification, a trou de loup (French: [tʁu d(ə) lu], lit. 'wolf hole'; plural trous de loup, also commonly referred to as a tiger pit in the East) was a type of booby trap or defensive obstacle. Each trou de loup consisted of a conical pit about 2 m (6 ft 7 in) deep and 1.2 to 2 m (3 ft 11 in to 6 ft 7 in) wide at the top. At the bottom of the pit, a sharpened punji stick (wooden stake) would be hammered in. In some cases, the pit was concealed by light cover of wicker and a layer of soil. Trous de loup might be found singly as a trap (in which case they were always concealed), or in a dense pattern with no gaps between pits, used as an obstacle in front of a defended position. A field of trous de loup could be made more effective if subsequently flooded to a shallow depth, which would conceal the pits, make their sides slippery, and add the risk of drowning.

Read on Wikipedia · Image Sakurambo, CC BY 2.5