When I was a child growing up in Springfield, my family often visited an area which we called King Philip's Stockade. The place was a small park which overlooked the Connecticut River (with the train tracks at the base of the hill on which the park was built). The entrance to the park was from Route 5 just before the Longmeadow line. My memories of the park (of now almost fifty years ago) are those of a place with quite a few picnic tables, some fireplaces, roads and perhaps some minor playground equipment. I recall being able to stand at the top of the hill, and look down on the passing trains and the Connecticut River.I think the park was pretty-much eliminated by the construction of I-91, and as noted, by rampant drug-dealing in later years.
My family could never explain (and I never bothered to ask) if some sort of fortification/lookout point had been placed here by King Philip and his followers during the war. It would be nice to know about that.