3 Words to use with barbettes

For basement read a tier of casemates, each with a black Cyclops of a big gun peering out; while above in the open air, with not even a parasol over their backs, lie the barbette guns, staring without a wink over sea and shore.

1 and 2 show the mounting of the 110½ ton gun in the barbette towers of the Benbow.

El Morro, a sea coast fort, with flanking barbette batteries, east of harbor entrance.

3 Words to use with  barbettes