Constant Spanish guerrilla activity so drained the resources and diverted the attention of the French military that Wellington was able to advance against and overcome a numerically superior enemy. So many French soldiers were being used to counter the guerrillas and the threat that they posed that less than a third of the French army could be tasked with confronting Wellington.>This book brings to life, for the first time, the formation, tactics and experiences of the Spanish guerrilla forces that fought Napoleon's army. Using much previously unpublished material, it offers a vivid description of the guerrilla and his lifestyle.