Warfare in the Age of Crusades: Europe explores in fascinating detail the key campaigns, battles and sieges that shaped the crusading period in Europe during the Middle Ages, giving special attention to military technologies, tactics and strategies. Key personalities and political factors are addressed, including the role of the papal monarchy in initiating the crusading expeditions and the use of crusade in the Christianization of the Baltic region and against heresies in Europe. 

Chapters focus on the Iberian crusades or Reconquista beginning in the eleventh century through to the final surrender of the Emirate of Granada in 1492. The northern or Baltic crusades are also a key element of the story. The narrative covers the involvement of the Holy Roman emperors and the popes, the military capabilities of the Baltic peoples, and the parts played by the Scandinavians as well as the Russians and Mongols. The concluding chapters reconsider crusades launched against heresies in Europe, specifically the Cathars and Hussites.