Leer is an intelligent soldier in Bäumer's company, and one of his classmates. He is very popular with women; when he and his comrades meet three French women, he is the first to seduce one of them. Bäumer describes Leer's ability to attract women by saying "Leer is an old hand at the game". In chapter 11, Leer is hit by a shell fragment, which also hits Bertinck. The shrapnel tears open Leer's hip, causing him to bleed to death quickly. His death causes Paul to ask himself, "What use is it to him now that he was such a good mathematician in school?"