sentences:  His son, Pierre Dreyfus, also served in World War I as an artillery officer and was awarded the Croix de Guerre.Alfred Dreyfus's two nephews also fought as artillery officers in the French Army and both were killed.The same artillery piece (the Obusier de 120 mm C modèle 1890), the secrets of which Dreyfus was accused of revealing to the Germans, was among those used in blunting the early German offensives.