Tim Blanning, Frederick the Great: King of Prussia (New York: Random House, 2016), 688 pp., $35.00. NAPOLEON SWIFTLY conquered Prussia in October 1806, inflicting crushing defeats at Jena and Auerstedt that humbled a realm long known for its military tradition. A bulletin announcing news of the two battles described them as expunging the fifty-year stain left by Frederick the Great’s victory over a French army at Rossbach in 1757. When he visited Frederick the Great’s tomb with a group of his generals, Napoleon purportedly instructed them, “hats off gentlemen, if he were alive we wouldn’t be here today.”