Liddell-Hart's The other Side of the Hill: Germany's Generals, Their Rise and Fall, With Their Own Account of Military Events, 1939-45.

He does an amazing job of breaking down the tendency of the Germans to blame things on Hitler, and showing exactly what happened. Eye opening.

Also an interesting study in the moral obligations of high command. Without Liddell Hart (probably my favorite military writer these days) saying it explicitly, I take away from it the terrible moral failure of the German generals isolating themselves from "political" decisions. It is convenient for the high-ranking officer to claim he only executes national policy determined by others, but to me, while his uniform prevents him from issuing orders to the highest civilian command, it does not, it must not remove him from the moral obligation to his country and his soldiers, to do what is right.

Matt