How is Macbeth deluded into thinking that he cant be defeated in act 5?

Answer 1

Two of the prophecies cause Macbeth is become very confident. First, the witches told him that he would not be defeated until Birnam wood comes to his castle Dunsinane. Second, the witches say he will not be defeated by any man born of woman. These prophecies cause MacBeth to feel invincible. When the army's numbers are disguised by all the soldiers holding tree branches and it is revealed that MacDuff was taken out of his mother's womb the deception yet truth of the prophecies is revealed and MacBeth's downfall becomes inevitable. MacBeth does not heed the last warning from the witches to avoid MacDuff and he is beheaded by MacDuff.