 Nevertheless, he started to write articles, and, after meeting Giuseppe Prezzolini, he became involved with the periodical "La Voce", to which (under the pseudonym Gino Bianchi) he contributed a large number of book reviews and pieces coloured by his religious sensibility.In 1915 he published "Resultanze", a satirical "biography" of Gino Bianchi which presents his life as one long exercise in bureaucracy, and which reflects Jahier's experiences in public administration.During World War I he was a volunteer and contributed to the trench newspaper "L'Astico".