In the countryside near Dunsinane the Scottish lords who have joined against Macbeth are waiting for Malcolm, Macduff, and the English support that they will bring. Menteith, Caithness, Angus, and Lennox discuss what they know of Macbeth's preparations for battle.
The king has fortified the Dunsinane castle, and they have heard word from those who hate Macbeth that he behaves madly. The lords decide amongst themselves that Macbeth's guilt has finally driven him crazy, and rightfully so because he has committed crimes so horrible that his own senses are reviled by his actions. The lords vow to fight for the rightful king, Malcolm, and to use all of their strength and ability to remove Macbeth from the throne. The lords and their soldiers march off to meet Malcolm and Macduff.
