I talked to some Civil War reenactors one day at my old job
I forget what size cannon they had but it was on a goose neck trailer. (it was very big)
They told me that one time they loaded it with a 25ft piece of 3/8 logging chain and fired it parallel with the ground.
Cleared out a lot of brush before it finally embeded itself in a oak tree.
They called it The Weedeater From Hell
They said they never did get the chain out of the tree.