 He had married in 1934 Irène Lot, the daughter of historian Ferdinand Lot and had become a French citizen in 1936.The group, one of the first "Résistance" units, was infiltrated by a Vichy supporter and, as a result, most of them were arrested, tried and the men among them sentenced to death.Vildé was killed by firing squad, together with Léon-Maurice Nordmann, Georges Ithier, Jules Andrieu, René Sénéchal, Pierre Walter and Anatole Lewitsky, on 23 February 1942 at Fort Mont-Valérien.