I didn't think the 80-90% casualty factor applied to the American frontier war but it apparently did according to this book: The Great Frontier War: Britain, France, and the Imperial Struggle for… http://books.google.com/books?id=DeZ...l=en#PPA126,M1

“In all, musket balls accounted for about 80% of deaths and wounds, and cannon shots and shells about 10 percent. Bayonets were rarely used and accounted for only 9 percent of casualties.”