Near this spot in 1865 a rock fort was built as a protection from Indians. It was a cooperative project. Each man who owned a city lot built one rod of the wall which was 3 l/2 feet at base, 12 feet high, 1 foot at top. There were portholes at intervals, wooden gates on east side. Men stood guard at all times. They gave signals, using a white flag by day and a drum by night. After 1878 the bell atop this monument hung in Academy Hall. It rang for church, school, and other occasions.