Some time ago I read about a farmer named Jack Hinson (57 during at the start of the war) who lived in Stewart County Tennessee, who became a Confederate partisan sniper against Union forces (Grants army) in regions of Tennessee and Kentucky during the American Civil War.
At the beginning he was neutral and agains the war, but took his custom made 50 caliber 41-inch barrel Kentucky Long Rifle and went to wage his own war against the Union when two of his sons were executed as suspected bushwhackers by Federal troops (their heads were cut off and stuck on the gate-posts to Hinson's home). As a one man army he targeted federals on land, transports, and gunboats and served as a guide for Nathan Bedford Forrest in his assault on the Union supply center at Johnsonville in 1864.
After years of harassing the union forces and being pursued by four Union regiments, he ended up surviving the war with an impressive kill count of over 100 federal seamen and infantry.
Here is one of the books about this great man: http://www.amazon.com/Jack-Hinsons-O.../dp/1589806409
If you got any stories of other effective individuals during the war, please share them