When construction crews unknowingly dug up four 10-pounder Parrott rifles in downtown Chester in 1986, historians were thrilled, and nervous.

All of the cannons were loaded with powder and shells, apparently booby-trapped to dissuade any invading Yankees from using them. The cannons were disarmed and preserved. Two were returned to Chester.

One Parrott, one of the best models of cannons manufactured by either side, guards Monument Square on Gadsden Street in downtown Chester. The other, just a block away to the east, guards the Chester County Courthouse on Main Street