This was a fun one, and right up my alley: Friday quiz: the eminent historians. I knew nine of them, had to guess on 2, 9, and 12, and missed 2 and 9. I would have gotten 2 if I'd gone with my first thought. So, ten out of twelve.
Several commenters seconded Tomasky's mention of The Great War and Modern Memory, and I agree. Reading it was an enormously satisfying and enlightening experience. I would add that it pairs wonderfully with Modris Ecksteins's Rites of Spring: The Great War and the Birth of the Modern Age.