Warfare is a major feature of the history of the middle ages, but its study has often been the province of amateurs; only recently have the technical details of warfare and its organisation been subject to proper scholarly investigation. Professor Verbruggen's major work, outstanding in its field, applies rigorous standards in analysing often very obscure surviving evidence, and reaches conclusions very different from earlier generations of military historians. He begins by analysing the sources for our knowledge of the military history of the period, assessing their reliability: some...