A temporary wooden tower built for defensive purposes.
An opening in the wall of a fortress through which the guns are levelled; a narrow loophole through which arrows and other missiles may be shot.
A tower at the entrance to a castle or fortified town
A fortress at the end of a bridge.
A projecting part of a rampart or other fortification.
A well-fortified position; a stronghold or citadel.
A person, group, or thing, that strongly defends some principle.
Any large prominence; something that resembles a bastion in size and form.
To furnish with a bastion.