While the men proclaim their hatred of the Montecchi, Romeo enters in the guise of a Montecchi envoy, offering peace to be guaranteed by the marriage of Romeo and Giulietta. He explains that Romeo regrets the death of Capellio's son (Cavatina: "Ascolta: Se Romeo t'uccise un figlio" / "Listen: If Romeo killed your son / he brought him death in battle / And you must blame fate"), and offers to take his place as a second son for the old man. Capellio indicates that Tebaldo has already taken on that role and—together with all his men—rejects all idea of peace: "War! War", the men proclaim. Romeo accepts their challenge of war: (Cabaletta: "La tremenda ultrice spada"/ "Romeo will prepare to brandish the dread avenging sword / Romeo accepts your challenge of war.)