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Why does Macduff arrive at Macbeth's castle?
He sensed something was wrong and came to protect the king.
Macduff was commanded to wake Duncan early in the morning.
He was off at war and could only now join the festivities at Macbeth's castle.
Macduff had heard the king was in attendance, though he himself was not invited.
Macduff and Macbeth had an appointment to meet early in the morning to discuss Scotland's business with the king.