abatis
advanced work
arch dam
backstop
balistraria
bamboo curtain
bank
banquette
bar
barbed-wire entanglement
barbican
barrage
barricade
barrier
bartizan
bastion
battlement
bear-trap dam
beaver dam
boom
breakwater
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
fence
fieldwork
fortalice
fortification
gate
glacis
munition
machicolation
blockhouse
breastworks
cairn
entrenchment
foss
intrenchment
palisade
parapet
rampart
redoubt
sconce
stockade