In Shakespeare's "Macbeth", Macbeth believes that he is invincible because the Three Witches give him the prophecy that "none of woman born shall harm ." In the final battle of the play, Macduff is able to kill Macbeth, because Macduff reveals that he was "from his mother's womb untimely ripp'd" — born via a Caesarean section. In a second prophecy, Macbeth is told that he has nothing to fear until Great Birnam Wood comes to Dunsinane Hill. He feels safe since he knows that forests cannot move, but is overcome when the English army, shielded with boughs cut from Birnam Wood, advances on his stronghold at Dunsinane.