Croissant

Croissant (French, crescent), a semicircular work that Bernard de Bélidor places in front of the salient angles of the covered way, where it forms a second covered way. It is also found in the main ditch in front of the points of the bastions, featuring a parapet that slopes down to form a glacis.
Bibliography
- Bélidor, Bernard Forest de: La science des ingenieurs dans la conduite des travaux de fortification et d’architecture civile (Paris 1729)
Source: Rumpf, H. F.: Allgemeine Real-Encyclopädie der gesammten Kriegskunst (Berl. 1827)