Answer:
The play Romeo and Juliet opens with a fight scene between the servants of the Montagues and Capulets. The purpose of this scene is to demonstrate how deep the hatred goes between the families. It's not just blood relatives fighting but any member of the household and its staff. Even the governing body of Verona, Prince Escalus, has trouble controlling the feud. By starting with their "new mutiny" that fuels the "ancient grudge", it develops the obstacle that Romeo and Juliet must overcome if they want to be together.