Bulwark

BUL'WARK, noun

1. In fortification, a bastion, or a rampart; a mound of earth round a place, capable of resisting cannon shot, and formed with bastions, curtains, etc.

2. A fortification; also, any means of defense; as, a navy is the bulwark of a nation.

3. That which secures against an enemy or external annoyance; a screen or shelter; means of protection and safety.

Salvation will God appoint for walls and bulwarks. [[Isaiah 26#1|Isaiah 26:1]].

BUL'WARK, verb transitive To fortify with a rampart; to secure by a fortification; to protect.