De Gaulle called it a 'fatal avenue' - that broad sweep of low-lying country stretching north east of Paris. Over the centuries, invading armies have swept back and forth over this bloody terrain, and the names of battles fought here read like a dictionary of military history - from Agincourt, Calais and Crecy to Verdun, Vimy and Ypres. Fatal Avenue is both a history and a guide - a unique study of a region that has witnessed more bitter military conflict than any other area of its size on earth.