I lived and grew up on Common Fence Point in Portsmouth, and attended Fort Butts School when it was newly opened (before it was renamed Portsmouth High School). We knew that the battlefield was there, by our school, but was never told of it's significance. There isn't much left to see. Considering that it was the most major Revolutionary War battle within Rhode Island; you would have thought that the tourist minded powers that be running that state would have preserved more of that important part of their historical heritage.
I live across the street from Butts Hill Fort and I would like people to know that there is very very little to see. A few small stone walls, a plaque, and a wide open space are all that remain of the fort. It is definitely not worth going out of your way for.