Yep, the Brown Bess. Couldn't hit the inside of a barn but with several thousand, aiming low, there was gonna be some damage.
I once saw a potty Professor giving a lecture at Nottingham University on explosives in the 70s. He set light to massive tubes of hydrogen, liquid oxygen and those sort of mundane things. He also showed what a Brown Bess could do when firing a candle at a barn door (he didn't actually use a flintlock but a percussion cap smooth bore), blimey, it was just like an R1 shooting a wall.
I tried to find anything similar on google and found a video with him on it! Here it is:
http://www.youtube.com/watch?v=orO3PxLPiKU