'Fort' in the Bible

And lay siege against it, and build a fort against it, and cast a mount against it; set the camp also against it, and set battering rams against it round about.

At his right hand was the divination for Jerusalem, to appoint captains, to open the mouth in the slaughter, to lift up the voice with shouting, to appoint battering rams against the gates, to cast a mount, and to build a fort.

He shall slay with the sword thy daughters in the field: and he shall make a fort against thee, and cast a mount against thee, and lift up the buckler against thee.