'Walls' in the Bible

Then a breach was made in the city, and all the men of war fled by night by the way of the gate between the two walls, which was by the king's garden (now the Chaldeans were against the city round about); and the king went by the way of the Arabah.

And all the army of the Chaldeans, that were with the captain of the guard, brake down the walls of Jerusalem round about.