During the Great War, Andreas Latzko (1876 - 1943) served as a line officer in the Austro-Hungarian Army. While at the front he was affected by the horrors of war until he found that he had seen enough of it all and deserted. Even before the war had ended he managed to create an anti-war novel and get it to press before the Armistice. Digitized here is the 1918 review of Men In War:
"Disillusionment and an almost morbid sympathy with mental and physical suffering are outstanding features of the book."
From Amazon: Men in War: