abatis
advanced work
arch dam
babette
backstop
balistraria
bamboo curtain
bank
banquette
bar
barbed-wire entanglement
barbican
barrage
barricade
barrier
bartizan
bastion
battlement
bear-trap dam
beaver dam
boom
breakwater
breastwork
brick wall
buffer
bulkhead
bulwark
casemate
cheval-de-frise
circumvallation
cofferdam
contravallation
counterscarp
curtain
dam
defense
demibastion
dike
ditch
drawbridge
earthwork
embankment
enclosure
entanglement
escarp
escarpment
esplanade
wall
archway
balustrade
battlements
buttress
chimney
cliff
cornice
fortification
ledge
masonry
moat
palisade
pier
pillar
railing
rampart
spire
stairway
terrace
tower
turret