Back at Dunsinane, Macbeth is getting a little overconfident. Dunsinane is well fortified, and he thinks he can wait out any attempt at a siege. The feeling is short-lived, though. He finds out that his wife has died, and that Birnam Wood is, in fact, marching to Dunsinane. Or, at least, thousands of soldiers carrying tree branches are. Macbeth vows to fight to the death.