Macbeth believes that he is invincible over Macduff’s army because the Witches and the apparitions prophesied “none of woman born / Shall harm Macbeth” (4.1.82–83) and “Macbeth shall never vanquished be until / Great Birnam Wood to high Dunsinane Hill / Shall come against him” (4.1.96–98). Macbeth interprets such prophecies literally. He reasons that since all men are born from women and woods can’t move, he is invincible.
