Read the excerpt from act i, scene i of romeo and juliet. benvolio: here were the servants of your adversary and yours close fighting ere i did approach: i drew to part them; in the instant came the fiery tybalt, with his sword prepar’d, 95 which, as he breath’d defiance to my ears, he swung about his head, and cut the winds, who, nothing hurt withal hiss’d him in scorn. according to benvolio, who caused the fight?

According to Benvolio, the fight was caused by the servants, whom he found already fighting when he got there.

Explanation: In this scene from Act 1, Montague, Benvolio's uncle, asks him who started the "ancient quarrel," and Benvolio replies by saying that Montague's servants were already fighting his enemy's servants when he arrived. He drew his sword in order to persuade them to stop the fight, but Tybalt arrived and he challenged him. They started fighting too, and soon other citizens joined them.