In Macbeth Act 1 Scene 2,King Ducan met with the Captain.
The Captain told the King about the details of the war.Telling how Macdonwald started a rebel, and the Norwegian Lord using this oppunity to start a war with King Ducan. However this does not made Macbeth worried.Eventually, the Norwegian Lord lost and wanted to sign a treaty. Demanding to bury their soldier by paying $10000. King Ducan refuse.Then,they found out that the Thawn of Cawdor betray King Ducan and he will be executed. Macbeth then obtained the new title.