La Belle Epoch
Got to disagreee with you there, Bowz. I didn't like that one much, I thought she really strained to make some points that weren't even remotely justified. I think it was biased, to far to the left. After all, what does the Trojan War have to do with anything? No one knows if it even happened. It's like using Heinlein to justify military strategy or political organization. The writer may have points worth hearing, but his story is not evidence of anything.
I think her best book was "The Proud Tower", a social and cultural history of the late Victorian Age and Edwardian age and into the Belle Epoch. It covers the period preceding the events of "Guns of August". It's one of her least known books, but it is terrific.