'Defenses' in the Bible

For I, the Lord God of Israel, have something more to say about the houses in this city and the royal buildings which have been torn down for defenses against the siege ramps and military incursions of the Babylonians:

Now the cistern where Ishmael threw all the dead bodies of those he had killed was a large one that King Asa had constructed as part of his defenses against King Baasha of Israel. Ishmael son of Nethaniah filled it with dead bodies.

The mighty warriors of Babylon have ceased to fight;They remain in their strongholds.Their strength and power have failed;They are becoming [weak and helpless] like women.Their dwelling places are set on fire;The bars on her gates are broken.