Berlin Dance of Death by Helmut Altner. A fascinating first hand account of the Battle of Berlin. It very well captures the chaos of that final battle.
Iron Coffins by Herbert A. Werner. It was recommended above and I will recommend it again, it is very good.
The Forgotten Soldier by Guy Sajer. Yes, the book of great controversy. Despite whatever factual errors it has, it is a fantastic literary work (take it from a Literature major) about men at war. As far as storytelling goes, Sajer ranks with Tolstoy, Remarque, and Graves.
If you gaze long into an abyss, the abyss will gaze into you.