WW I poster France World War I, French propaganda poster showing the use of the hand grenade, which was first introduced during WWI. Original title: Journee du Poilu. 25 et 26 decembre 1915. Organisee par le parlement. Translation of title: Poilu Day. December 25 and 26, 1915. Organized by Parliament. Maurice Neumont (1868-1930) Lithograph poster, color ; 100 x 79 cm. Devambez. Paris 1915.