On 09 October 2016, U.S. Air Force Explosive Ordnance Disposal personnel responded to calls of cannonballs hitting Folly Beach, South Carolina.

Turns out Hurricane Matthew dug up some U.S. Civil War era cannonballs.  During the War Between the States, Charleston was the site of several naval battles, including the use of some of the world’s first armored battleships, called monitors (aka Ironclads).