The book tells the story of Paul Bäumer, a German soldier who—urged on by his school teacher—joins the German army shortly after the start of World War I. His class was "scattered over the platoons amongst Frisian fishermen, peasants, and labourers." Bäumer arrives at the Western Front with his friends and schoolmates (Leer, Müller, Kropp and a number of other characters). There they meet Stanislaus Katczinsky, an older soldier, nicknamed Kat, who becomes Paul's mentor. While fighting at the front, Bäumer and his comrades have to engage in frequent battles and endure the treacherous and filthy conditions of trench warfare.