Carliol Tower, cannonballs and human remains

In 1823 whilst the tower was being altered by the Weaver's Company, workmen were clearing away the accumulated earth over the ditch outside the tower. They apparently found several skeletons huddled together and in the skull of one of them was a cannon ball. A 24 pound cannon ball was also found lodged 2.5 footdeep in the wall. Caution - the report is second hand with no source given, but the circumstantial evidence implies Civil War victims.