'Earthworks' in the Bible

See, they have made earthworks against the town to take it; and the town is given into the hands of the Chaldaeans who are fighting against it, because of the sword and need of food and disease: and what you have said has taken place, and truly you see it.

For this is what the Lord, the God of Israel, has said about the houses of this town and the houses of the kings of Judah, which have been broken down to make earthworks and ...;

And in the ninth year of his rule, on the tenth day of the tenth month, Nebuchadrezzar, king of Babylon, came against Jerusalem with all his army and took up his position before it, building earthworks all round it.