Key:defensive_works
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| Description |
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Military constructions or buildings designed for the defence of territories in warfare 
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| Group: military |
| Used on these elements |
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| Documented values: 3 |
| Useful combination |
| See also |
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Status: approved.svg.png){kind=icon}
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| Tools for this tag |
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This key is used to tag individual defensive structures mainly at historic/pre-modern 
fortifications. It is intended for all structures that were built for the defence of territories in warfare. This includes fortified settlements as well as forts that are/were uninhabited during peacetime.
Values for =* contain terms used in fortification engineering.[1][2][3][4][5]
How to map
Individual defensive works should be mapped as Nodes at their centre, as Ways along a centre line or as Areas along the outlines. The best fitting method depends on the size and shape of the structure. They should be tagged with =* and may receive additional tags.
Mappers are encouraged to combine this tag with other tags where they are relevant. If a structure is actively used by the military, it is recommended to add a military=* tag to it.
Tagging
| Key | Value | Description | Sample photo |
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barbican
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A barbican
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bastion
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A bastion. The tag =demi-bastion also has minor usage.
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battery
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A fixed artillery battery.
Individual guns or cannons can be tagged with |
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batardeau
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A ![[W]](./Wikidata-logo.svg.png){kind=logo} batardeau[6]
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caponier
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A caponier
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cavalier
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A cavalier
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_02_ies.jpg)
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counterguard
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A counterguard
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counterscarp
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A counterscarp
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_-_391094_-_onroerenderfgoed.jpg)
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couvreface
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A couvreface
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crownwork
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A crownwork
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curtain_wall
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A curtain wall. See also defensive wall.
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faussebraye
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A faussebraye is a lower wall in front of the main defensive wall of a fortification.
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glacis
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A glacis is an artificial slope that is part of a fortification.
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hornwork
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A hornwork
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inundation_sluice
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A sluice made for military inundation
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lunette
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A lunette or demi-lune is an outwork in the shape of a half-moon.
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moat
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A moat that historically provided a fortification with a preliminary line of defence.
For moats filled with water, add the tags |
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motte
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A motte
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ravelin
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A ravelin
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redan
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A redan
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redoubt
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A redoubt
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reduit
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A reduit
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roundel
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A roundel
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tenaille
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A tenaille
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water_gate
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A water gate
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User-defined | Use technical terms in fortification engineering. | 
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Tags to use in combination
name=*- if a defensive structure is named. Do not use the name of the fortification to tag individual structures.heritage=*- if the structure has a heritage status. If only the entire fortification has a heritage status, do not use heritage tags for individual structures.building=bunker- if the structure is abunkerstart_date=*- year of completionabandoned=yes- if the structure has been abandoned and shows signs of decayruins=yes- if the structure is in ruins
barrier=city_wallbarrier=sally_portbarrier=tank_trapbunker_type=*historic=cannonhistoric=castle_wallhistoric=city_gatehistoric=citywallshistoric=fortmilitary=trenchtower:type=defensivewall=castle_wallwater=moat
Diagrams
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Star fort -
Glacis -
Counterguard and couvreface -
A bastion with three cavaliers -
Curtain walls of a bastion fort -
A crownwork (A) and a lunette (B) -
Redan and flèche
References
- ↑ https://www.angelfire.com/wy/svenskildbiter/madict.html
- ↑ https://books.google.nl/books?id=6gc0AQAAMAAJ&pg=PR41-IA1#v=onepage&q&f=false
- ↑ https://books.google.nl/books?id=AUFYAAAAcAAJ&pg=PP3#v=onepage&q&f=false
- ↑ https://en.wikipedia.org/wiki/List_of_established_military_terms#Engineering
- ↑ https://en.wikipedia.org/wiki/Category:Fortification_(architectural_elements)
- ↑ https://books.google.nl/books?id=6gc0AQAAMAAJ&pg=PA122