Canon fire

I've often wondered how my super-sophisticated, high-tech Canon DSLR would fare against the cannons used in the Civil War.  At 8.5 frames per second, my Canon could easily "outshoot" the lumbering 2,000 lb  single-shot artillery pieces used at Gettysburg.  But the battlefield is so massive, approximately 3 x 5 miles, I wasn't sure I'd have enough "ammuniton".  If …