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How Battles Were Fought
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Ancient Field Obstacles

Obstacles laid on the ground to slow or injure attackers, including the iron caltrop and the concealed pit known as the trou de loup. A weapon belongs here when its cited article describes it as an area denial device or defensive pit. It excludes siege engines, which attack fortifications rather than defend them. Defenders scattered caltrops on roads and in gateways to cripple horses and men, and dug pits or rows of pits in front of walls, and both methods remained in use well beyond antiquity.

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Ancient Field Obstacles
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Caltrop (Wikipedia)
Has Member: Caltrop, Lead sentence
Quote, Has Member: Caltrop, Lead sentence
A caltrop (/ˈkæl.tɹəp, ˈkal.-, ˈkɔːl.-/; also known as caltrap, galtrop, cheval trap, galthrap, galtrap, calthrop, jackrock or crow's foot) is an area denial weapon made up of usually four, but possibly more, sharp nails or spines arranged in such a manner that one of them always points upward from a stable base (for example, a regular tetrahedron).
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Trou de loup, Wikipedia
Has Member: Trou de Loup, Lead sentence
Quote, Has Member: Trou de Loup, Lead sentence
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.
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