Friar Laurence tells Prince the whole story of Romeo and Juliet and what happened between them, the plan ,and everything else
When Prince says this he means both Capulets and Montegues lost members of their families.
ALL ARE PUNSHIED
A glooming peace this morningwith it brings; The sun for sorrow will not show his head: Go hence, to have more talk of these sad things; Some shall be pardon'd and some punished: For was a story of more woe Than this of Juliet and her Romeo.
Let's end it
At the end of the play the Capulets and Montagues decide they should end their fued. They realised they caused deaths because of their fued.