This edition of Wargames Illustrated features a 7 page article on incorporating ACW guerillas into the game. There are three scenes covering Bushwhackers and Jayhawkers with profiles, special rules and additional cards (you'll need to scan these from the mag and print to card) for using the gangs.
There's plenty of other interesting wargaming stuff including the Battle of Raphia in 217 BCE, 7th century Mercian armies and wargaming the "Ganster" era in the USA.
Weight only 35g for postage purposes so for the mag on its own, P&P is £1.20 to the UK/EU, £2.50 to the RotW. See Customer Service page for full details of postage charges.