Robinson Crusoe by Daniel Defoe Chapter 4 Page 31

Then I took the pieces of cable which I had cut in the ship, and laid them in rows, one upon another, within the circle, between these two rows of stakes, up to the top, placing other stakes in the inside, leaning against them, about two feet and a half high, like a spur to a post; and this fence was so strong, that neither man nor beast could get into it or over it. This cost me a great deal of time and labour, especially to cut the piles in the woods, bring them to the place, and drive them into the earth.

The entrance into this place I made to be, not by a door, but by a short ladder to go over the top; which ladder, when I was in, I lifted over after me; and so I was completely fenced in and fortified, as I thought, from all the world, and consequently slept secure in the night, which otherwise I could not have done;