Born at Honfleur, Calvados, the young André Marie studied at primary and secondary level there, going on to the "Lycée Pierre Corneille", when his parents moved to Rouen in 1908. While preparing to apply to the École Normale Supérieure Lettres et Sciences Humaines, he was mobilised at the end of 1916. By the end of World War I, he commanded a battery of 75 men. He received two light injuries and numerous commendations. He was decorated with the Croix de guerre with palm.