Stefan Zweig wrote Die Welt von Gestern as well as many other books that were famous earlier in the century - Ungeduld des Herzens, which I reviewed, Schachnovelle, Buchmendel, Amok and some famous biographies, among which the most famous is probably Maria Stuart.

You are thinking of Arnold Zweig, who wrote a six-part anti-war/pacifist story, of which the first part is called Der Streit um den Sergeanten Grischa.

Interestingly enough, I was reading a history book on the war - I don't remember if it was Tuchman, or Gilbert or someone else - and Arnold Zweig is incorrectly cited as Stefan Zweig (i.e., it says something about Stefan Zweig's "Grischa", which is patently wrong). I found it amusing and irritating at the same time.