This history of medieval warfare, originally written in 1885 when its author--later one of the great medievalists--was still an undergraduate at Oxford, remains for students and general readers one of the best accounts of military art in the Middle Ages between Adrianople in 378 A.D. (the most fearful defeat suffered by a Roman army since Cannae in 216 B.C.) and Marignano (1515 A.D.), the last of the triumphs of the medieval horseman. It was extensively revised and edited by John H. Beeler in 1953 to incorporate many new facts uncovered since the late nineteenth century.