'Walls' in the Bible

Let us make, I pray thee, a small upper chamber with walls, and let us set for him there a bed, and a table, and a seat, and a lampstand; and it shall be when he cometh to us, he shall turn in thither.

And the city was broken into; and all the men of war fled by night, by the way of the gate between the two walls, which leads to the king's garden (now the Chaldeans were by the city round about); and they went the way toward the plain.

And all the army of the Chaldeans that were with the captain of the body-guard broke down the walls of Jerusalem round about.