Verbruggen's study is prefaced by discussion of the problems of reconstruction and extensive consideration of the sources, showing the difficulties faced by medieval military historians in attempts to interpret them. He then offers his own account of the events of that dramatic day, a case study in the reconstruction of events in one of the greatest battles of the Middle Ages. J.F. Verbruggen lectured at the Royal Military School in Brussels, and then taught in Africa, retiring as Professor of History, University of Congo, and University of Bujumbura (Burundi). He is also the author of "The Art of Warfare in Western Europe", which was originally published in Dutch in 1954, and later translated and updated.