What does the interaction between Siward and Macduff mean in Act V, Scene 6 of Macbeth?
Act V Scene 6
Fare you well.
Do we but find the tyrant's power to-night,
Let us be beaten, if we cannot fight.
Make all our trumpets speak; give them all breath,
Those clamorous harbingers of blood and death.
In Act 5, Scene 7, Siward and Macbeth are talking each other into a fervor, encouraging one another to get ready to fight.
During Act 5, the armies of Malcolm are mobilizing against Macbeth. Macduff is the driving force between the effort to kill Macbeth, since he wants revenge for his family’s murder.
Before this exchange, they have cut off tree branches and used them as disguises, but Malcolm says they are close enough to put them down and proceed. They are very near to the battle.
Worthy Macduff and we
Shall take upon's what else remains to do,
According to our order. (Act 5, Scene 7)
Siward’s comment indicates that he is not afraid of battle. They will be beaten if they can’t fight, so he wishes them luck.
Macduff, of course, wants to kill Macbeth. He comments that trumpets are “ harbingers of blood and death” meaning they are signals of the battle