'Walls' in the Bible

And Hiram king of Tyre sendeth messengers unto David, and cedar-trees, and artificers of wood, and artificers of stone, for walls, and they build a house for David,

Meanwhile, David was sitting between the inner and outer gates of the city. The watchman was up on the roof of the gateway near the walls, looking around, and there was a man running by himself!

By you I devastate armies, by my God I scale walls.