his volume draws together a remarkable range of expertise in the study of medieval warfare and crusading. Its fifteen essays cover a wide variety of topics, spanning chronologically from the Carolingian period through to the early fourteenth century. Some offer new insights upon long-contested issues, such as the question of whether a new form of cavalry was created by Charles Martel and his successors or the implications of the Mongol defeat at Ayn Jalut. Others use innovative methodologies to unlock the potential of various types of source material including: manuscript illuminations depicting warfare, Templar graffiti, German crusading songs, and crusading charters. Several of the articles open up new areas of debate connected to the history of crusading. Malcolm Barber discusses why Christendom did not react decisively to the fall of Acre in 1291. Bernard Hamilton explores how the rising Frankish presence in the Eastern Mediterranean during the central medieval period reshaped Christendom's knowledge and understanding of the North African cultures they encountered. In this way, this work seeks both to advance debate in core areas whilst opening new vistas for future research.