Macbeth Act V, Scene iii Summary

Macbeth is at his castle with the doctor and his attendants, and seems charged for battle. He is confidently bombastic – sure that he can't be defeated because of the sisters' new prophecy. He can't imagine Birnam Wood moving to march on Dunsinane, nor that any man could not be of-woman-born. Macbeth contends that with this knowledge, his heart is doubtless and fearless.
Just then, a messenger enters with the doubtful and fearful news that there are ten thousand somethings marching to Dunsinane.
Macbeth guesses that the somethings are geese. Seriously.
The messenger says no, good try, but actually they're men coming to kill you.
The messenger is much abused.
Macbeth then thinks on himself. He says he has lived long enough; it is clear he will not have a peaceful old age, but rather will have fight to the last (which might be very soon).
Macbeth confirms the news of the approaching army, as well as the lack of geese, via his servant Seyton, and then decides to don his armor to face them head on. He then asks the doctor about his Lady.
The doctor reports she isn't sick so much as she is plagued by ill fantasies. Macbeth suggests that the doctor cure her, sooner rather than later.
The doctor replies that the woman's got to fix herself.
Macbeth attends to the battle again, and asks whether the doctor has the means to purge the English from the countryside of Scotland. The only sensible one in the lot, the doctor, says no amount of money could convince him to stay near the madhouse of Dunsinane.

Act V, Scene iv

Act V, Scene ii