general/fortification-architectural-elements
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Glacis
Protective slope built into a fortification
Redan
Feature in fortifications
Ravelin
Triangular fortification
Casemate
Fortified structure
Carnot wall
Fortification system used in 19th-century Europe
Lunette (fortification)
Outwork fortification
Sconce (fortification)
Type of fortification
Terreplein
Surface of a rampart
Caponier
Type of fortification structure
Reduit
Fortified structure
Crownwork
Element of the trace italienne system of fortification