Final answer:
Benvolio is attacked by Tybalt in Act 1 when he tries to stop a fight between the Montague and Capulet servants.
Step-by-step explanation:
In Act 1 of Romeo and Juliet, Benvolio is attacked by Tybalt as he attempts to stop the fight between the servants of the Montague and Capulet households. The conflict begins when servants from both families engage in a brawl, and Benvolio, a Montague, steps in to break up the fight. He pleads for peace, but the aggressive Tybalt, a Capulet, confronts him and accuses him of being part of the fight, leading to a larger escalation between the two family factions.