redoubt Synonyms

forts protection presidio parapet palisade outwork murage keep guard glacis garrison fortress rampart ravelin fortifications alamo wall vauntmure vallation tower stronghold stockade sconce sanctuary redan fortresses fortification fortalice bulwark breastwork blockhouse bastion barrier barricade barbican barbacan banquette balistraria alcazar castle chateau fort fence fastness embankment earthwork dread donjon dike defense