Vegetius' late Roman text became a well-known and highly respected 'classic' in the Middle Ages, transformed by its readers into the authority on the waging of war. Christopher Allmand analyses the medieval afterlife of the De Re Militari, tracing the growing interest in the text from the Carolingian world to the late Middle Ages, suggesting how the written word may have influenced the development of military practice in that period. While emphasising that success depended on a commander's ability to outwit the enemy with a carefully selected, well-trained and disciplined army, the De Re Militari inspired other unexpected developments, such as that of the 'national' army, and helped create a context in which the role of the soldier assumed greater social and political importance. Allmand explores the significance of the text and the changes it brought for those who accepted the implications of its central messages.

Essays consider the variety of responses to warfare and combat in medieval literature.

De Re Militari by Vegetius is the famous strategy book written in times of the Roman Empire. It explains how they organized their armies, battles, sieges, and war strategies. This is the complete official edition and it contains the 4th part (how to perform sieges, city defenses, and naval warfare) which is not included in commonly available basic editions. De Re Militari is essential to understand European strategy and war due to the fact that, besides describing the military might of Rome in practical terms, it was also used by generals and rulers in the next centuries and the Middle Ages to organize European armies, conduct sieges, reinforce castles, train soldiers, and conquer enemy nations. So much so that generals would be judged and measured in warfare skills by their knowledge and understanding of Vegetius.