Crusoe is astonished one day to discover the single print of a man’s naked foot in the sand. Crusoe is terrified and retreats to his “castle,” where he entertains thoughts that the devil has visited the island. His conclusion that it is not the devil’s but a real man’s footprint is equally terrifying, and Crusoe meditates on the irony of being starved for human contact and then frightened of a man. Driven wild by fear, Crusoe fortifies his home and raises guns around it, keeping watch whenever possible. Concerned about his goats, he contrives to dig an underground cave in which to herd them every night and creates another smaller pasture far away to keep a second flock. Crusoe spends two years living in fear.