AdvertisementSubmit a letter:Email us letters@nybooks.comReviewed:Iron and Blood: A Military History of the German-Speaking Peoples Since 1500by Peter H. WilsonBelknap Press/Harvard University Press, 913 pp., $39.95On October 20, 1943, the German émigrés Herbert Marcuse, one of the most prominent theorists of the Frankfurt School, and Felix Gilbert, a noted historian, both of whom were working for US intelligence, submitted a secret report entitled “The Significance of Prussian Militarism for Nazi Imperialism” to the Office of Strategic Services.1 It rejected the widely held thesis that...…AdvertisementSubmit a letter:Email us letters@nybooks.comReviewed:Iron and Blood: A Military History of the German-Speaking Peoples Since 1500by Peter H. WilsonBelknap Press/Harvard University Press, 913 pp., $39.95On October 20, 1943, the German émigrés Herbert Marcuse, one of the most prominent theorists of the Frankfurt School, and Felix Gilbert, a noted historian, both of whom were working for US intelligence, submitted a secret report entitled “The Significance of Prussian Militarism for Nazi Imperialism” to the Office of Strategic Services.1 It rejected the widely held thesis that...WW…