In what Acts/Scene in "Romeo and Juliet" is there fighting?

I only need the Act and Scene in which there is physical fighting. I would appreciate, (but its not required), if you told me who was fighting, why, and how adequately Shakespeare describes the fight. But just the Act and Scene would be fine. I know Act 1 Scene 1 has some fighting, but it isnt too descriptive, so any fight scene other than that is fine.