Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]

Narrower term/s

• acropolises [NP]
• fortification elements [NP][+]
  • casemates [+]
    • traditor casemates
  • batteries (platforms) [+]
    • indented batteries
    • flank batteries
  • baileys [+]
    • inner baileys
    • outer baileys
  • keeps [+]
    • shell keeps
  • outworks [+]
    • barbicans
    • counterscarps
    • scarps (fortification elements)
    • glacis
    • hornworks
    • moats [NP] [+]
      • main moats
      • ravelin ditches [NP]
      • parikhā
    • palisades (outworks)
    • ravelins [+]
      • redans
    • covered ways (fortification elements)
    • fosses [NP] [+]
      • moats [+]
      • defensive dikes
    • countermines
    • caponiers
    • flèches (fortification elements)
    • demi-lunes (outworks)
  • cavaliers (fortification elements)
  • fortification openings [+]
    • sally ports
    • loopholes
  • [defensive walls and defensive wall components] [+]
    • defensive walls [+]
      • breastworks
      • enceintes [+]
      • curtain walls (fortification elements)
      • ramparts [+]
      • murus gallicus
      • valla
      • honmaru
      • bulwarks
      • epaulements
      • faussebrayes
      • anti-tank walls
    • defensive wall components [+]
      • banquettes (defensive wall components)
      • terrepleins
      • machicolations
      • bartizans
      • [battlements and battlement components] [+]
      • roundels (defensive wall components)
      • batardeaus
  • [bastions and bastion components] [+]
    • bastions (fortification elements) [+]
      • karṇāṭṭalaka
    • bastion components [+]
      • gorges (bastion components)
      • salients
      • epaulements [NP]
      • flanks (bastion components)
      • orillons
  • mottes
  • tenshu
  • chevaux de frise
  • inundation sluices
  • cunettes
  • ravelin ditches
  • dítái
  • dūntái
• city walls
• bawns
• castles (fortifications)[+]
  • moated castles
  • qasrs
  • châtelets
  • motte-and-bailey castles
• fortresses[+]
  • alcazars
  • citadels [+]
    • kotlas
  • migdols
  • ksour [NP]
  • dzongs
• forts[+]
  • fortlets
  • hillforts
  • star-forts
  • bastioned forts
  • promontory forts
  • polygonal forts
  • pā tūwatawata
• redoubts
• stockades
• field fortifications[+]
  • trous-de-loup
• limites
• plant fortifications
• coastal fortifications
• barricades
• antiaircraft towers
• tighremts
• burgs [NP]
• sconces (fortifications)
• lines (defensive works)[+]
  • inundation lines
• pillboxes (military structures)
• guard booths

Anotations

Scope note:

General term for any works made to oppose a small number of troops against a greater.