rock: upon maturely considering this, therefore, I resolved to draw me a second fortification, in the manner of a semicircle, at a distance from my wall, just where I had planted a double row of trees about twelve years before, of which I made mention: these trees having been planted so thick before, they wanted but few piles to be driven between them, that they might be thicker and stronger, and my wall would be soon finished. So that I had now a double wall; and my outer wall was thickened with pieces of timber, old cables, and everything I could think of, to make it strong; having in it seven little holes, about as big as I might put my arm out at.

In the inside of this I thickened my wall to about ten feet thick with continually bringing earth out of my cave, and laying it at the foot of the wall, and walking upon it;