There's an ahead-of-its-time 1964 documentary CULLODEN wherein a soldier refers to that lethality.
A pretty neat movie in that the director had only about 200 extras to work with, many speaking Gaelic, and used an unusual "You are there" technique as well as "This is a three-pound cannonball, this is what it does." narrative.
Got the usual criticism at the time, too gory, inaccurate, social commentary, etc. but still a good one hour flick. (Private Lang and Stewart's advisor O'Sullivan are pieces of work.)
I saw that one in a military history class. Highly recommended. The two actors you mentioned were terrific. The actor playing Bonnie Prince Charlie had to attempt a Scots/Polish accent (historically correct but he got slammed for it. I did not know before that that Charlie was related to Jan Sobieski.) Great stuff.