As others have noted, the actual battlefield site consists of the equivalency of city lot. A couple of gravestones, some unknown stone markers that appear to have some Roman numerals, and the monuments plus a couple of cannon and some interpretive panels.
According to a ranger at Shiloh, the location of the battlefield is where the wagon trains were located; the actual battlefield he stated i partially under Walmart.
Overall there is pretty much not much there, and it is quite disappointing. Brice Corners, which is up the road a little bit is somewhat more extensive.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.