Book excerpt: This major new book surveys the gripping history of the knights and their order and relates their rise to power; their struggles against Prussian pagans; the series of wars against Poland and Lithuania; the clash with Alexander Nevsky's Russia; and the gradual stagnation of the order in the fourteenth century. The book is replete with dramatic episodes--such as the battle on frozen Lake Peipus in 1242, or the disaster of Tannenberg--but focuses primarily on the year-after-year struggle to maintain power, fend off incursions and raiding bands, and launch crusades against unbelieving foes.