In "Romeo and Juliet," the initial conflict between the Capulet and Montague households is sparked by the servants of both families, specifically Sampson and Gregory, who engage in a brawl in the streets of Verona. As they encounter two Montague servants, Sampson boasts of his allegiance to the Capulets and begins a verbal altercation, which quickly turns physical when swords are drawn.
In Act 1, Scene 1 of the play, Sampson says, "I will take the wall of any man or maid of Montague's." This shows his loyalty to the Capulet family and his willingness to fight for them. Gregory adds, "The quarrel is between our masters and us their men," which highlights the fact that the servants are fighting on behalf of their respective families.
The fight between the servants may seem insignificant in the grand scheme of the play, but it sets the tone for the entire story. The feud between the two families runs deep, and even the servants are willing to fight and die for their respective houses. The animosity between the Capulets and Montagues is so intense that it spills over into the streets and affects the entire city of Verona.
Overall, the fight between Sampson and Gregory and the Montague servants is the catalyst for the larger conflict in "Romeo and Juliet." It serves as a reminder of the intense hatred between the two families and the tragic consequences that can arise from their ongoing feud.