The play begins with the brief appearance of a trio of witches and then moves to a military camp, where the Scottish King Duncan hears the news that his generals
Macbeth and Banquo, have defeated two separate invading armies—one from Ireland, led by the rebel Macdonwald, and one from Norway.
Lady Macbeth receives news from her husband of the prophecy and his new title and she vows to help him become king by any means she can.
Macbeth’s return is followed almost at once by Duncan’s arrival. The Macbeths plot together and later that night, while all are sleeping and after his wife has given the guards drugged wine, Macbeth kills the King and his guards.