Thanks for sharing. Very interesting. I would imagine at the time that was a decent size ball to be fired with gun powder. Metallurgy and black powder were not what they were even in the US Revolutionary War.
Amazingly but perhaps not, the Fox article didn't even show the whole cannon ball even though it was only 3 inches in diameter. But then again, that's Fox...only giving part of the story.
Fortunately the BBC article was on top of things with a nice image.