Types of fortifications: Scheme of a (non-existent) fortress according to the bastioned system with the most important parts and preliminary works depicted.

(1) Flank
(2) Curtain wall
(3) Gorge
(4) Face (of bastion)
(5) Firing crest (interior crest)
(7) Glacis
(8) Covered way
(9) Counterscarp
(10) Ditch
(11) Cunette
(12) Scarp
(13) Berm
(14) Exterior slope of rampart
(15) Superior slope
(16) Banquette
(17) Chemin de ronde (allure)
(18) Inner slope
(19) Glacis (top view)
(20) Tenaille (as outer work)
(21) Demi-lune
(22) Hornwork
(23) Moat
(24) Bastion (with curved flanks and orreillons)
(25) Ravelin
(26) Bastion (Old Dutch Fortification System)
(27) Double Tenaille (as preparatory work)
(28) Places of arms
(29) Covered way
(30) Counterguard
(31) Curtain wall
(32) Tenaille (as defense of the curtain wall)
(33) Priest cap (bishop's mitre)
(34) Crownwork
(35) Revetment (protection of the shore)
(36) Citadel
(37) Faussebraye (bottom)
(38) Terreplein
Own work
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