Charles Dupont, an officer educated at the Polytechnic, and a former gunner, was moved to the Intelligence Services after the Dreyfus Affair; he accomplished many secret missions in Germany before taking charge of the Bureau of Intelligence in 1913, traversing the big military shocks of the Western Front: the Marne (1914), Verdun (1916), and the Aisne (1917) Considered the best Allied specialist by the German army, Dupont is also a perspicacious observer; his memoires, unprinted until now, are an exceptional testimony to the personalities of Generals Joffre, Nivelle, and Petain, and other political men with whom he crossed paths. Text in French