Ravelin
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![The ravelin outside the Land Gate at Tilbury Fort](../../../upload/thumb/b/b8/Tilbury_fort_ravelin.jpg/180px-Tilbury_fort_ravelin.jpg)
A ravelin is a triangular fortification, detached outwork in front of the bastions. Originally called a demi-lune, lunette, (semidetached outwork) the ravelin is placed outside a castle opposite a fortification curtain. The edges of the ravelin are placed so that the guns there can sweep fire upon the troops that have to run along the fortification curtain.
- See also: Bastion fortress
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