CHRIS MCNAB is a freelance writer and historian, who has written a number of bestselling titles on the history of warfare and weaponry. His books include: The Machine Gun Story, The World War I Story, The World War II Story (all, The History Press) and The Somme 1916 (Pitkin Publishing). He lives just outside Swansea, Wales. Will Fowler is a professor of Latin American studies at the University of St. Andrews. His books include "Mexico in the Age of Proposals, 18211;1853," "Tornel and Santa Anna: The Writer and the Caudillo, Mexico, 17951;1853," and "Latin America, 18001;2000."