Sampson and Gregory start a fight with Abram and Balthasar.
Then Benvolio tries to break up the fight but Tybalt enters and sees Benvolio with his sword out and also joins the fight.
Several others from the Montague and Capulet families join the fight.
The Prince arrives and says if it continues they he will kill them. He also wants to talk with Capulet and Montague.