what I particulary noticed in that book, is how fact of being socialist, bring him hate of his officers, disgraded, and how he endend the war exhausted, after 4 years of trench fighting, unable to fight any more. Never read something else like that. This book was one of François Miterrand's (french president of the Republic from 1981 to 1995) favorite.
I also hardly recommand "Ceux de 14" from Maurice Genevoix. This captain always had the matter of his men and dedicated his memories to his dead fellow friend. Maurice Genevoix woulh have had the "prix Goncourt" 1916, if he hadn't described french retreats. The price finaly go to "Le feu" from Henri Barbusse.
For the German side, you may read "Orage d'acier" from the real warrior Ernst Junger or "A l'ouest rien de nouveau" from Erich Maria Remarque.