Lost in the midst of the violence of the First World War was a holocaust that differed from that of Hitler's only in its scale. The Turkish government let loose upon its own Armenian citizens its hordes of savage killers, recruited from its prisons, to perpetuate one of history's most barbaric slaughters upon a peaceful and progressive people, massacring a million and a half of its three million Armenian population. During Hitler's planning of the extermination of the Jews, he is quoted by history as saying, "After all, who speaks nowadays of the massacre of the Armenians?" Vahan Gregory's...