Final answer:
The lines are spoken by the Captain in Macbeth, and describe Macbeth's bravery and violent actions.
Step-by-step explanation:
The lines “Disdaining fortune, with his brandish’d steel, Which smoked with bloody execution, Like valour’s minion carved out his passage Till he faced the slave;” are spoken by the Captain in the play Macbeth. These lines describe the bravery and violent actions of Macbeth on the battlefield, where he carved a passage through his enemies until he confronted an opponent face to face. The Captain praises Macbeth for his valor and bloody execution.