HH Kirst's books about Gunner Asch are quite good, in a "WW2 from the other side" sort of way.
Hans-Helmut Kirst (in contrast to Grass) also introduced the expression "08/15" into the German language. As in: "How's things?" - Wie läuft's? And the answer is "08/15" (nullachtfünfzehn); in other words "depressingly normal" or "same old, same old. It's also the title of one of his books and a filum made about it. Well worth a read and a watch, although I don't know if they're available in English.